Title 40: Protection of Environment

PART 63—NATIONAL EMISSION STANDARDS FOR HAZARDOUS AIR POLLUTANTS 

FOR SOURCE CATEGORIES

Subpart NNN—National Emission Standards for Hazardous Air 

Pollutants for Wool Fiberglass Manufacturing

Source: 64 FR 31709, June 14, 1999, unless otherwise noted. 

§63.1380 Applicability.

(a) Except as provided in paragraphs (b) and (c) of this 

section, the requirements of this subpart apply to the owner or 

operator of each wool fiberglass manufacturing facility that is 

a major source or is located at a facility that is a major 

source.

(b) The requirements of this subpart apply to emissions of 

hazardous air pollutants (HAPs), as measured according to the 

methods and procedures in this subpart, emitted from the 

following new and existing sources at a wool fiberglass 

manufacturing facility subject to this subpart:

(1) Each new and existing glass-melting furnace located at 

a wool fiberglass manufacturing facility;

(2) Each new and existing rotary spin wool fiberglass 

manufacturing line producing a bonded wool fiberglass building 

insulation product; and

(3) Each new and existing flame attenuation wool fiberglass 

manufacturing line producing a bonded pipe product and each new 
flame attenuation wool fiberglass manufacturing line producing a 

bonded heavy-density product.

(c) The requirements of this subpart do not apply to a wool 

fiberglass manufacturing facility that the owner or operator 

demonstrates to the Administrator is not a major source as 

defined in §63.2.

(d) The provisions of this part 63, subpart A that apply 

and those that do not apply to this subpart are specified in 

Table 1 of this subpart.

§63.1381 Definitions.

Terms used in this subpart are defined in the Clean Air 

Act, in §63.2, or in this section as follows:

Affirmative defense means, in the context of an enforcement 

proceeding, a response or defense put forward by a defendant, 

regarding which the defendant has the burden of proof, and the 

merits of which are independently and objectively evaluated in a 

judicial or administrative proceeding.

Bag leak detection system means systems that include, but 

are not limited to, devices using triboelectric, light 

scattering, and other effects to monitor relative or absolute 

particulate matter (PM) emissions.

Bonded means wool fiberglass to which a phenol-formaldehyde 

binder has been applied.
Building insulation means bonded wool fiberglass 

insulation, having a loss on ignition of less than 8 percent and 

a density of less than 32 kilograms per cubic meter (kg/m3 ) (2 

pounds per cubic foot [lb/ft3 ]).

Cold top electric furnace means an all-electric glassmelting furnace that operates with a temperature of 120 °C (250 

°F) or less as measured at a location 46 to 61 centimeters (18 

to 24 inches) above the molten glass surface.

Flame attenuation means a process used to produce wool 

fiberglass where molten glass flows by gravity from melting 

furnaces, or pots, to form filaments that are drawn down and 

attenuated by passing in front of a high-velocity gas burner 

flame.

Glass-melting furnace means a unit comprising a refractory 

vessel in which raw materials are charged, melted at high 

temperature, refined, and conditioned to produce molten glass. 

The unit includes foundations, superstructure and retaining 

walls, raw material charger systems, heat exchangers, melter 

cooling system, exhaust system, refractory brick work, fuel 

supply and electrical boosting equipment, integral control 

systems and instrumentation, and appendages for conditioning and 

distributing molten glass to forming processes. The forming 

apparatus, including flow channels, is not considered part of 

the glass-melting furnace.
Glass pull rate means the mass of molten glass that is 

produced by a single glass-melting furnace or that is used in 

the manufacture of wool fiberglass at a single manufacturing 

line in a specified time period.

Hazardous Air Pollutant (HAP) means any air pollutant 

listed in or pursuant to section 112(b) of the Clean Air Act.

Heavy-density product means bonded wool fiberglass 

insulation manufactured on a flame attenuation manufacturing 

line and having a loss on ignition of 11 to 25 percent and a 

density of 8 to 48 kg/m3 (0.5 to 3 lb/ft3 ).

Incinerator means an enclosed air pollution control device 

that uses controlled flame combustion to convert combustible 

materials to noncombustible gases. For the purposes of this 

rule, the term ‘incinerator’ means ‘regenerative thermal 

oxidizer’ (RTO).

Loss on ignition (LOI) means the percent decrease in weight 

of wool fiberglass after it has been ignited. The LOI is used to 

monitor the weight percent of binder in wool fiberglass

Manufacturing line means the manufacturing equipment for 

the production of wool fiberglass that consists of a forming 

section where molten glass is fiberized and a fiberglass mat is 

formed and which may include a curing section where binder resin 

in the mat is thermally set and a cooling section where the mat 

is cooled.
New source means any affected source the construction or 

reconstruction of which is commenced after March 31, 1997.

Pipe product means bonded wool fiberglass insulation 

manufactured on a flame attenuation manufacturing line and 

having a loss on ignition of 8 to 14 percent and a density of 48 

to 96 kg/m3 (3 to 6 lb/ft3 ).

Rotary spin means a process used to produce wool fiberglass 

building insulation by forcing molten glass through numerous 

small orifices in the side wall of a spinner to form continuous 

glass fibers that are then broken into discrete lengths by highvelocity air flow. Any process used to produce bonded wool 

fiberglass building insulation by a process other than flame 

attenuation is considered rotary spin.

Wool fiberglass means insulation materials composed of 

glass fibers made from glass produced or melted at the same 

facility where the manufacturing line is located.

Wool fiberglass manufacturing facility means any facility 

manufacturing wool fiberglass on a rotary spin manufacturing 

line or on a flame attenuation manufacturing line.

§63.1382 Emission standards

(a) Emission limits 

(1) Glass-melting furnaces. On and after the date the 

initial performance test is completed or required to be 

completed under §63.7 of this part, whichever date is earlier, 
(i) The owner or operator of each existing glass-melting 

furnace must not discharge or cause to be discharged into the 

atmosphere in excess of:

(A) 0.014 pound (lb) of particulate matter (PM) per ton of 

glass pulled;

(B) 0.0020 lb of hydrogen fluoride (HF) per ton of glass 

pulled; and 

(C) 0.0015 lb of hydrogen chloride (HCl) per ton of glass 

pulled. 

(D) 0.00006 lb of chromium (Cr) compounds per ton of glass 

pulled (60 lb per million tons glass pulled).

(ii) The owner or operator of each new or reconstructed 

glass-melting furnace must not discharge or cause to be 

discharged into the atmosphere in excess of:

(A) 0.0018 lb of PM per ton of glass pulled; 

(B) 0.00078 lb of HF per ton of glass pulled; and 

(C) 0.00078 lb of HCl per ton of glass pulled. 

(D) 0.00006 lb of Cr compounds per ton of glass pulled (60 

lb per million tons glass pulled).

(2) Rotary spin manufacturing lines. On and after the date 

the initial performance test is completed or required to be 

completed under §63.7 of this part, whichever date is earlier, 
(i) The owner or operator of each existing rotary spin (RS) 

manufacturing line must not discharge or cause to be discharged 

into the atmosphere in excess of:

(A) 0.17 lb of formaldehyde per ton of glass pulled; 

(B) 0.19 lb of phenol per ton of glass pulled; and 

(C) 0.48 lb of methanol per ton of glass pulled. 

(ii) The owner or operator of each new or reconstructed RS 

manufacturing line must not discharge or cause to be discharged 

into the atmosphere in excess of: 

(A) 0.020 lb of formaldehyde per ton of glass pulled; 

(B) 0.0011 lb of phenol per ton of glass pulled; and 

(C) 0.00067 lb of methanol per ton of glass pulled. 

(3) Flame attenuation manufacturing lines. On and after the 

date the initial performance test is completed or required to be 

completed under §63.7 of this part, whichever date is earlier, 

(i) The owner or operator of each existing flame 

attenuation (FA) manufacturing line that produces heavy-density 

wool fiberglass and/or pipe insulation must not discharge or 

cause to be discharged into the atmosphere in excess of:

(A) 5.6 lb of formaldehyde per ton of glass pulled; 

(B) 1.4 lb of phenol per ton of glass pulled; and 

(C) 0.50 lb of methanol per ton of glass pulled. (ii) The 

owner or operator of each new or reconstructed FA manufacturing 

line that produces heavy-density wool fiberglass and/or pipe 
insulation must not discharge or cause to be discharged into the 

atmosphere in excess of:.

(A) 3.3 lb of formaldehyde per ton of glass pulled;

(B) 0.46 lb of phenol per ton of glass pulled; and 

(C) 0.50 lb of methanol per ton of glass pulled. 

(b) Operating limits. On and after the date on which the 

performance test required to be conducted by §§63.7 and 63.1384 

is completed, the owner or operator must operate all affected 

control equipment and processes according to the following 

requirements.

(1)(i) The owner or operator must initiate corrective 

action within 1 hour of an alarm from a bag leak detection 

system and complete corrective actions in a timely manner 

according to the procedures in the operations, maintenance, and 

monitoring plan.

(ii) The owner or operator must implement a Quality 

Improvement Plan (QIP) consistent with the compliance assurance 

monitoring provisions of 40 CFR part 64, subpart D when the bag 

leak detection system alarm is sounded for more than 5 percent 

of the total operating time in a 6-month block reporting period.

(2)(i) The owner or operator must initiate corrective 

action within 1 hour when any 3-hour block average of the 

monitored electrostatic precipitator (ESP) parameter is outside 

the limit(s) established during the performance test as 
specified in §63.1384 and complete corrective actions in a 

timely manner according to the procedures in the operations, 

maintenance, and monitoring plan.

(ii) The owner or operator must implement a QIP consistent 

with the compliance assurance monitoring provisions of 40 CFR 

part 64 subpart D when the monitored ESP parameter is outside 

the limit(s) established during the performance test as 

specified in §63.1384 for more than 5 percent of the total 

operating time in a 6-month block reporting period.

(iii) The owner or operator must operate the ESP such that 

the monitored ESP parameter is not outside the limit(s) 

established during the performance test as specified in §63.1384 

for more than 10 percent of the total operating time in a 6-

month block reporting period.

(3)(i) The owner or operator must initiate corrective 

action within 1 hour when any 3-hour block average temperature 

of a cold top electric furnace as measured at a location 46 to 

61 centimeters (18 to 24 inches) above the molten glass surface, 

exceeds 120 °C (250 °F) and complete corrective actions in a 

timely manner according to the procedures in the operations, 

maintenance, and monitoring plan.

(ii) The owner or operator of a cold top electric furnace 

must implement a QIP consistent with the compliance assurance 

monitoring provisions of 40 CFR part 64, subpart D when the 
temperature, as measured at a location 46 to 61 centimeters (18 

to 24 inches) above the molten glass surface, exceeds 120 °C 

(250 °F) for more than 5 percent of the total operating time in 

a 6-month block reporting period.

(iii) The owner or operator must operate the cold top 

electric furnace such that the temperature does not exceed 120 

°C (250 °F) as measured at a location 46 to 61 centimeters (18 

to 24 inches) above the molten glass surface, for more than 10 

percent of the total operating time in a 6-month reporting 

period.

(4)(i) The owner or operator must initiate corrective 

action within 1 hour when any 3-hour block average value for the 

monitored parameter(s) for a glass-melting furnace, which uses 

no add-on controls and which is not a cold top electric furnace, 

is outside the limit(s) established during the performance test 

as specified in §63.1384 and complete corrective actions in a 

timely manner according to the procedures in the operations, 

maintenance, and monitoring plan.

(ii) The owner or operator must implement a QIP consistent 

with the compliance assurance monitoring provisions of 40 CFR 

Part 64 subpart D when the monitored parameter(s) is outside the 

limit(s) established during the performance test as specified in 

§63.1384 for more than 5 percent of the total operating time in 

a 6-month block reporting period.
(iii) The owner or operator must operate a glass-melting 

furnace, which uses no add-on controls and which is not a cold 

top electric furnace, such that the monitored parameter(s) is 

not outside the limit(s) established during the performance test 

as specified in §63.1384 for more than 10 percent of the total 

operating time in a 6-month block reporting period.

(5)(i) The owner or operator must initiate corrective 

action within 1 hour when the average glass pull rate of any 4-

hour block period for glass melting furnaces equipped with 

continuous glass pull rate monitors, or daily glass pull rate 

for glass melting furnaces not so equipped, exceeds the average 

glass pull rate established during the performance test as 

specified in §63.1384, by greater than 20 percent and complete 

corrective actions in a timely manner according to the 

procedures in the operations, maintenance, and monitoring plan.

(ii) The owner or operator must implement a QIP consistent 

with the compliance assurance monitoring provisions of 40 CFR 

part 64, subpart D when the glass pull rate exceeds, by more 

than 20 percent, the average glass pull rate established during 

the performance test as specified in §63.1384 for more than 5 

percent of the total operating time in a 6-month block reporting 

period.

(iii) The owner or operator must operate each glass-melting 

furnace such that the glass pull rate does not exceed, by more 
than 20 percent, the average glass pull rate established during 

the performance test as specified in §63.1384 for more than 10 

percent of the total operating time in a 6-month block reporting 

period.

(6) The owner or operator must operate each control device 

used to control formaldehyde, phenol, and methanol emissions 

from forming or curing such that any 3-hour block average 

temperature in the firebox does not fall below the average 

established during the performance test as specified in 

§63.1384.

(7)(i) The owner or operator must initiate corrective 

action within 1 hour when the average pressure drop, liquid flow 

rate, or chemical feed rate for any 3-hour block period is 

outside the limits established during the performance tests as 

specified in §63.1384 for each wet scrubbing control device and 

complete corrective actions in a timely manner according to the 

procedures in the operations, maintenance, and monitoring plan.

(ii) The owner or operator must implement a QIP consistent 

with the compliance assurance monitoring provisions of 40 CFR 

part 64, subpart D when any scrubber parameter is outside the 

limit(s) established during the performance test as specified in 

§63.1384 for more than 5 percent of the total operating time in 

a 6-month block reporting period.
(iii) The owner or operator must operate each scrubber such 

that each monitored parameter is not outside the limit(s) 

established during the performance test as specified in §63.1384 

for more than 10 percent of the total operating time in a 6-

month block reporting period.

(8)(i) The owner or operator must initiate corrective 

action within 1 hour when the monitored process parameter 

level(s) is outside the limit(s) established during the 

performance test as specified in §63.1384 for the process 

modification(s) used to control formaldehyde emissions and 

complete corrective actions in a timely manner according to the 

procedures in the operations, maintenance, and monitoring plan.

(ii) The owner or operator must implement a QIP consistent 

with the compliance assurance monitoring provisions of 40 CFR 

part 64, subpart D when the process parameter(s) is outside the 

limit(s) established during the performance test as specified in 

§63.1384 for more than 5 percent of the total operating time in 

a 6-month block reporting period.

(iii) The owner or operator must operate the process 

modifications such that the monitored process parameter(s) is 

not outside the limit(s) established during the performance test 

as specified in §63.1384 for more than 10 percent of the total 

operating time in a 6-month block reporting period.
(9) The owner or operator must use a resin in the 

formulation of binder such that the free-formaldehyde content of 

the resin used does not exceed the free-formaldehyde range 

contained in the specification for the resin used during the 

performance test as specified in §63.1384.

(10) The owner or operator must use a binder formulation 

that does not vary from the specification and operating range 

established and used during the performance test as specified in 

§63.1384. For the purposes of this standard, adding or 

increasing the quantity of urea and/or lignin in the binder 

formulation does not constitute a change in the binder 

formulation.

§63.1383 Monitoring requirements.

On and after the date on which the performance test 

required to be conducted by §§63.7 and 63.1384 is completed, the 

owner or operator must monitor all affected control equipment 

and processes according to the following requirements.

(a) The owner or operator of each wool fiberglass 

manufacturing facility must prepare for each glass-melting 

furnace, rotary spin manufacturing line, and flame attenuation 

manufacturing line subject to the provisions of this subpart, a 

written operations, maintenance, and monitoring plan. The plan 

must be submitted to the Administrator for review and approval 
as part of the application for a part 70 permit. The plan must 

include the following information:

(1) Procedures for the proper operation and maintenance of 

process modifications and add-on control devices used to meet 

the emission limits in §63.1382;

(2) Procedures for the proper operation and maintenance of 

monitoring devices used to determine compliance, including 

quarterly calibration and certification of accuracy of each 

monitoring device according to the manufacturers's instructions; 

and

(3) Corrective actions to be taken when process parameters

or add-on control device parameters deviate from the limit(s) 

established during initial performance tests.

(b)(1) Where a baghouse is used to control PM emissions 

from a glass-melting furnace, the owner or operator shall 

install, calibrate, maintain, and continuously operate a bag 

leak detection system.

(i) The bag leak detection system must be certified by the 

manufacturer to be capable of detecting PM emissions at 

concentrations of 10 milligrams per actual cubic meter (0.0044 

grains per actual cubic foot) or less.

(ii) The bag leak detection system sensor must produce 

output of relative PM emissions.
(iii) The bag leak detection system must be equipped with 

an alarm system that will sound automatically when an increase 

in relative PM emissions over a preset level is detected and the 

alarm must be located such that it can be heard by the 

appropriate plant personnel.

(iv) For positive pressure fabric filter systems, a bag 

leak detection system must be installed in each baghouse 

compartment or cell. If a negative pressure or induced air 

baghouse is used, the bag leak detection system must be 

installed downstream of the baghouse. Where multiple bag leak 

detection systems are required (for either type of baghouse), 

the system instrumentation and alarm may be shared among the 

monitors.

(v) A triboelectric bag leak detection system shall be 

installed, operated, adjusted, and maintained in a manner 

consistent with the U.S. Environmental Protection Agency 

guidance, “Fabric Filter Bag Leak Detection Guidance” (EPA–

454/R–98–015, September 1997). Other bag leak detection systems 

shall be installed, operated, adjusted, and maintained in a 

manner consistent with the manufacturer's written specifications 

and recommendations.

(vi) Initial adjustment of the system shall, at a minimum, 

consist of establishing the baseline output by adjusting the 
range and the averaging period of the device and establishing 

the alarm set points and the alarm delay time.

(vii) Following the initial adjustment, the owner or 

operator shall not adjust the range, averaging period, alarm 

setpoints, or alarm delay time except as detailed in the 

approved operations, maintenance, and monitoring plan required 

under paragraph (a) of this section. In no event shall the range 

be increased by more than 100 percent or decreased more than 50 

percent over a 365-day period unless a responsible official as 

defined in §63.2 of the general provisions in subpart A of this 

part certifies that the baghouse has been inspected and found to 

be in good operating condition.

(2) The operations, maintenance, and monitoring plan 

required by paragraph (a) of this section must specify 

corrective actions to be followed in the event of a bag leak 

detection system alarm. Example corrective actions that may be 

included in the plan include the following:

(i) Inspecting the baghouse for air leaks, torn or broken 

bags or filter media, or any other conditions that may cause an 

increase in emissions.

(ii) Sealing off defective bags or filter media.

(iii) Replacing defective bags or filter media, or 

otherwise repairing the control device.

(iv) Sealing off a defective baghouse compartment.
(v) Cleaning the bag leak detection system probe, or 

otherwise repairing the bag leak detection system.

(vi) Shutting down the process producing the particulate 

emissions.

(c)(1) Where an ESP is used to control PM emissions from a 

glass-melting furnace, the owner or operator must monitor the 

ESP according to the procedures in the operations, maintenance, 

and monitoring plan. (2)The operations, maintenance, and 

monitoring plan for the ESP must contain the following 

information:

(i) The ESP operating parameter(s), such as secondary 

voltage of each electrical field, to be monitored and the 

minimum and/or maximum value(s) that will be used to identify 

any operational problems;

(ii) A schedule for monitoring the ESP operating 

parameter(s);

(iii) Recordkeeping procedures, consistent with the 

recordkeeping requirements of §63.1386, to show that the ESP 

operating parameter(s) is within the limit(s) established during 

the performance test; and

(iv) Procedures for the proper operation and maintenance of 

the ESP.

(d) The owner or operator must measure and record at least 

once per shift the temperature 46 to 61 centimeters (18 to 24 
inches) above the surface of the molten glass in a cold top 

electric furnace that does not use any add-on controls to 

control PM emissions.

(e)(1) Where a glass-melting furnace is operated without an 

add-on control device to control PM emissions, the owner or 

operator must monitor the glass-melting furnace according to the 

procedures in the operations, maintenance, and monitoring plan.

(2) The operations, maintenance, and monitoring plan for 

the glass-melting furnace must contain the following 

information:

(i) The operating parameter(s) to be monitored and the 

minimum and/or maximum value(s) that will be used to identify 

any operational problems;

(ii) A schedule for monitoring the operating parameter(s) 

of the glass-melting furnace;

(iii) Recordkeeping procedures, consistent with the 

recordkeeping requirements of §63.1386, to show that the glassmelting furnace parameter(s) is within the limit(s) established 

during the performance test; and

(iv) Procedures for the proper operation and maintenance of 

the glass-melting furnace.

(f) The owner or operator who uses a control device to 

control HAP emissions from a glass-melting furnace, RS 

manufacturing line, or FA manufacturing line must install, 
calibrate, maintain, and operate a monitoring device that 

continuously measures an appropriate parameter that is 

correlated to the emission limit performance test.

(g)(1) The owner or operator who uses an incinerator to 

control formaldehyde emissions from forming or curing shall 

install, calibrate, maintain, and operate a monitoring device 

that continuously measures and records the operating temperature 

in the firebox of each incinerator.

(2) The owner or operator must inspect each incinerator at 

least once per year according to the procedures in the 

operations, maintenance, and monitoring plan. At a minimum, an 

inspection must include the following:

(i) Inspect all burners, pilot assemblies, and pilot 

sensing devices for proper operation and clean pilot sensor, as 

necessary;

(ii) Ensure proper adjustment of combustion air and adjust, 

as necessary;

(iii) Inspect, when possible, internal structures, for 

example, baffles, to ensure structural integrity per the design 

specifications;

(iv) Inspect dampers, fans, and blowers for proper 

operation;

(v) Inspect for proper sealing;

(vi) Inspect motors for proper operation;
(vii) Inspect combustion chamber refractory lining and 

clean and repair/replace lining, as necessary;

(viii) Inspect incinerator shell for corrosion and/or hot 

spots;

(ix) For the burn cycle that follows the inspection, 

document that the incinerator is operating properly and make any 

necessary adjustments; and

(x) Generally observe that the equipment is maintained in 

good operating condition.

(xi) Complete all necessary repairs as soon as practicable.

(h) The owner or operator who uses a wet scrubbing control 

device to control formaldehyde emissions must install, 

calibrate, maintain, and operate monitoring devices that 

continuously monitor and record the gas pressure drop across 

each scrubber and scrubbing liquid flow rate to each scrubber 

according to the procedures in the operations, maintenance, and 

monitoring plan. The pressure drop monitor is to be certified by 

its manufacturer to be accurate within ±250 pascals (±1 inch 

water gauge) over its operating range, and the flow rate monitor 

is to be certified by its manufacturer to be accurate within ±5 

percent over its operating range. The owner or operator must 

also continuously monitor and record the feed rate of any 

chemical(s) added to the scrubbing liquid.
(i)(1) The owner or operator who uses process modifications 

to control formaldehyde emissions must establish a correlation 

between formaldehyde emissions and a process parameter(s) to be 

monitored.

(2) The owner or operator must monitor the established 

parameter(s) according to the procedures in the operations, 

maintenance, and monitoring plan.

(3) The owner or operator must include as part of their 

operations, maintenance, and monitoring plan the following 

information:

(i) Procedures for the proper operation and maintenance of 

the process;

(ii) Process parameter(s) to be monitored to demonstrate 

compliance with the applicable emission limits in §63.1382. 

Examples of process parameters include LOI, binder solids 

content, and binder application rate;

(iii) Correlation(s) between process parameter(s) to be 

monitored and formaldehyde emissions;

(iv) A schedule for monitoring the process parameter(s); 

and

(v) Recordkeeping procedures, consistent with the 

recordkeeping requirements of §63.1386, to show that the process 

parameter value(s) established during the performance test is 

not exceeded.
(j) The owner or operator must monitor and record the freeformaldehyde content of each resin shipment received and used in 

the formulation of binder.

(k) The owner or operator must monitor and record the 

formulation of each batch of binder used.

(l) The owner or operator must monitor and record at least 

once every 8 hours, the product LOI and product density of each 

bonded wool fiberglass product manufactured.

(m) For all control device and process operating parameters 

measured during the initial performance tests, the owners or 

operators of glass-melting furnaces, rotary spin manufacturing 

lines or flame attenuation manufacturing lines subject to this 

subpart may change the limits established during the initial 

performance tests if additional performance testing is conducted 

to verify that, at the new control device or process parameter 

levels, they comply with the applicable emission limits in 

§63.1382. The owner or operator shall conduct all additional 

performance tests according to the procedures in this part 63, 

subpart A and in §63.1384.

§63.1384 Performance test requirements.

(a) The owner or operator subject to the provisions of this 

subpart shall conduct a performance test to demonstrate 

compliance with the applicable emission limits in §63.1382. 

Compliance is demonstrated when the emission rate of the 
pollutant is equal to or less than each of the applicable 

emission limits in §63.1382. The owner or operator shall conduct 

the performance test according to the procedures in 40 CFR part 

63, subpart A and in this section.

(1) All monitoring systems and equipment must be installed, 

operational, and calibrated prior to the performance test.

(2) Unless a different frequency is specified in this 

section, the owner or operator must monitor and record process 

and/or add-on control device parameters at least every 15 

minutes during the performance tests. The arithmetic average for 

each parameter must be calculated using all of the recorded 

measurements for the parameter.

(3) During each performance test, the owner or operator 

must monitor and record the glass pull rate for each glassmelting furnace and, if different, the glass pull rate for each 

rotary spin manufacturing line and flame attenuation 

manufacturing line. Record the glass pull rate every 15 minutes 

during any performance test required by this subpart and 

determine the arithmetic average of the recorded measurements 

for each test run and calculate the average of the three test 

runs.

(4) The owner or operator shall conduct a performance test 

for each existing and new glass-melting furnace.
(5) During the performance test, the owner or operator of a 

glass-melting furnace controlled by an ESP shall monitor and 

record the ESP parameter level(s), as specified in the 

operations, maintenance, and monitoring plan, and establish the 

minimum and/or maximum value(s) that will be used to demonstrate 

compliance after the initial performance test.

(6) During the performance test, the owner or operator of a 

cold top electric furnace that is not equipped with an add-on 

control device for PM emissions control, must monitor and record 

the temperature 46 to 61 centimeters (18 to 24 inches) above the 

molten glass surface to ensure that the maximum temperature does 

not exceed 120 °C (250 °F).

(7) During the performance test, the owner or operator of a 

glass melting furnace (other than a cold top electric furnace) 

that is not equipped with an add-on control device for PM 

emissions control, must monitor and record the furnace parameter 

level, and establish the minimum and/or maximum value(s) that 

will be used to demonstrate compliance after the initial 

performance test.

(8) The owner or operator must conduct a performance test 

for each rotary spin manufacturing line, subject to this 

subpart, while producing the building insulation with the 

highest LOI expected to be produced on that line; and for each 

flame attenuation manufacturing line, subject to this subpart, 
while producing the heavy-density product or pipe product with 

the highest LOI expected to be produced on the affected line.

(9) The owner or operator of each rotary spin manufacturing 

line and flame attenuation manufacturing line regulated by this 

subpart must conduct performance tests using the resin with the 

highest free-formaldehyde content. During the performance test 

of each rotary spin manufacturing line and flame attenuation 

manufacturing line regulated by this subpart, the owner or 

operator shall monitor and record the free-formaldehyde content 

of the resin, the binder formulation used, and the product LOI 

and density.

(10) During the performance test, the owner or operator of 

a rotary spin manufacturing line or flame attenuation 

manufacturing line who plans to use process modifications to 

comply with the emission limits in §63.1382 must monitor and 

record the process parameter level(s), as specified in the 

operations, maintenance, and monitoring plan, which will be used 

to demonstrate compliance after the initial performance test.

(11) During the performance test, the owner or operator of 

a rotary spin manufacturing line or flame attenuation 

manufacturing line who plans to use a wet scrubbing control 

device to comply with the emission limits in §63.1382 must 

continuously monitor and record the pressure drop across the 

scrubber, the scrubbing liquid flow rate, and addition of any 
chemical to the scrubber, including the chemical feed rate, and 

establish the minimum and/or maximum value(s) that will be used 

to determine compliance after the initial performance test.

(12) During the performance test, the owner or operator of 

a rotary spin manufacturing line or affected flame attenuation 

manufacturing line shall continuously record the operating 

temperature of each incinerator and record the average during 

each 1-hour test; the average operating temperature of the three 

1-hour tests shall be used to monitor compliance.

(13) Unless disapproved by the Administrator, an owner or 

operator of a rotary spin or flame attenuation manufacturing 

line regulated by this subpart may conduct short-term 

experimental production runs using binder formulations or other 

process modifications where the process parameter values would 

be outside those established during performance tests without 

first conducting performance tests. Such runs must not exceed 1 

week in duration unless the Administrator approves a longer 

period. The owner or operator must notify the Administrator and 

postmark or deliver the notification at least 15 days prior to 

commencement of the short-term experimental production runs. The 

Administrator must inform the owner or operator of a decision to 

disapprove or must request additional information prior to the 

date of the short-term experimental production runs. 
Notification of intent to perform an experimental short-term 

production run shall include the following information:

(i) The purpose of the experimental production run;

(ii) The affected line;

(iii) How the established process parameters will deviate 

from previously approved levels;

(iv) The duration of the experimental production run;

(v) The date and time of the experimental production run; 

and

(vi) A description of any emission testing to be performed 

during the experimental production run.

(b) To determine compliance with the PM emission limit for 

glass-melting furnaces, use the following equation:

P

C Q K

E

  1  (Eq. 1)

Where:

E = Emission rate of PM, kg/Mg (lb/ton) of glass pulled;

C = Concentration of PM, g/dscm (gr/dscf);

Q = Volumetric flow rate of exhaust gases, dscm/h (dscf/h);

K1 = Conversion factor, 1 kg/1,000 g (1 lb/7,000 gr); and

P = Average glass pull rate, Mg/h (tons/h).

(c) To determine compliance with the emission limit for 

formaldehyde, phenol, or methanol for rotary spin manufacturing 

lines and flame attenuation manufacturing lines, and for 

chromium compounds, HF, or HCl for glass-melting furnaces, use 

the following equation:
6

3

1

10

1

1

 

   



K P

C MW Q K K

E (Eq. 2)

Where:

E = Emission rate of formaldehyde, phenol, methanol, chromium 

compounds, HF, or HCl, kg/Mg (lb/ton) of glass pulled;

C = Measured volume fraction of formaldehyde, phenol, 

methanol, chromium compounds, HF, or HCl, ppm;

MW = Molecular weight of formaldehyde, 30.03 g/g-mol;

molecular weight of phenol, 94.11 g/g-mol; molecular 

weight of methanol, 32.04 g/g-mol; molecular weight of

chromium compounds tested in g/g-mol; molecular weight of 

HF, 20.0064 g/g-mol; molecular weight of HCl, 36.4611 

g/g-mol;

Q = Volumetric flow rate of exhaust gases, dscm/h (dscf/h);

K1 = Conversion factor, 1 kg/1,000 g (1 lb/453.6 g);

K2 = Conversion factor, 1,000 L/m3 (28.3 L/ft3 );

K3 = Conversion factor, 24.45 L/g-mol; and

P = Average glass pull rate, Mg/h (tons/h).

(d) Following the initial performance or compliance test to 

be conducted within 90 days of [INSERT PROMULGATION DATE OF THE 

RULE] to demonstrate compliance with the chromium compounds 

emissions limit specified in §63.1382(a)(1)(D) or (a)(ii)(D), 

you must conduct an annual performance test for chromium 

compounds emissions from each glass-melting furnace (no later 

than 12 calendar months following the previous compliance test). 

(e) Following the initial performance or compliance test to 

demonstrate compliance with the PM, HF, HCl, formaldehyde, 

phenol, and methanol emissions limits specified in §63.1382, you 

must conduct a performance test to demonstrate compliance with 

each of the applicable PM, HF, HCl, formaldehyde, phenol, and 

methanol emissions limits in §63.1382 of this subpart at least 
once every 5 years and as often as raw material inputs change by 

more than 10 percent following the previous test.

§63.1385 Test methods and procedures.

(a) The owner or operator shall use the following methods 

to determine compliance with the applicable emission limits:

(1) Method 1 (40 CFR part 60, appendix A) for the selection 

of the sampling port location and number of sampling ports;

(2) Method 2 (40 CFR part 60, appendix A) for volumetric 

flow rate;

(3) Method 3 or 3A (40 CFR part 60, appendix A) for O2and 

CO2for diluent measurements needed to correct the concentration 

measurements to a standard basis;

(4) Method 4 (40 CFR part 60, appendix A) for moisture 

content of the stack gas;

(5) Method 5 and Method 202 (40 CFR part 60, appendix A) 

for the concentration of total PM including condensibles. Each 

run must consist of a minimum run time of 2 hours and a minimum 

sample volume of 60 dry standard cubic feet (dscf). The probe 

and filter holder heating system may be set to provide a gas 

temperature no greater than 177 ±14 °C (350 ±25 °F);

(6) Method 318 (appendix A of this part) for the 

concentration of formaldehyde, phenol, and methanol. Each run 

must consist of a minimum run time of 2 hours;
(7) Method contained in appendix A of this subpart for the 

determination of product LOI;

(8) Method contained in appendix B of this subpart for the 

determination of the free-formaldehyde content of resin;

(9) Method contained in appendix C of this subpart for the 

determination of product density;

(10) An alternative method, subject to approval by the 

Administrator.

(b) Each performance test shall consist of 3 runs. The 

owner or operator shall use the average of the three runs in the 

applicable equation for determining compliance.

(11) Method 0061 (appendix A of this subpart) for the 

concentration of chromium compounds and hexavalent chromium. 

Each run must consist of a minimum run time of 1 hour.

(12) Method 26A or Method 320 (appendix A of this subpart) for 

the concentration of HF and HCl. Each run must consist of a 

minimum run time of 1 hour.

§63.1386 Notification, recordkeeping, and reporting 

requirements.

(a) Notifications. As required by §63.9(b) through (h) of 

this part, the owner or operator shall submit the following 

written initial notifications to the Administrator:
(1) Notification for an area source that subsequently 

increases its emissions such that the source is a major source 

subject to the standard;

(2) Notification that a source is subject to the standard, 

where the initial startup is before [INSERT DATE OF PUBLICATION 

OF THIS PROPOSED RULE IN THE FEDERAL REGISTER]. (3) Notification 

that a source is subject to the standard, where the source is 

new or has been reconstructed, the initial startup is after 

[INSERT DATE OF PUBLICATION OF THIS PROPOSED RULE IN THE FEDERAL 

REGISTER], and for which an application for approval of 

construction or reconstruction is not required;

(4) Notification of intention to construct a new affected 

source or reconstruct an affectedsource; of the date 

construction or reconstruction commenced; of the anticipated 

date of startup; of the actual date of startup, where the 

initial startup of a new or reconstructed source occurs after 

[INSERT DATE OF PUBLICATION OF THIS PROPOSED RULE IN THE FEDERAL 

REGISTER], and for which an application for approval or 

construction or reconstruction is required (See §63.9(b)(4) and 

(5) of this part);

(5) Notification of special compliance obligations;

(6) Notification of performance test; and (7) Notification 

of compliance status.
(b) Performance test report. As required by §63.10(d)(2) of 

the general provisions, the owner or operator shall report the 

results of the initial performance test as part of the 

notification of compliance status required in paragraph (a)(7) 

of this section.

(c) Startup, shutdown, and malfunction plan and reports. 

(1) The owner or operator shall develop a written plan as 

described in §63.6(e)(3) that contains specific procedures to be 

followed for operating the source and maintaining the source 

during periods of startup, shutdown, and malfunction and a 

program of corrective action for malfunctioning process 

modifications and control systems used to comply with the 

standards. In addition to the information required in 

§63.6(e)(3), the plan shall include:

(i) Procedures to determine and record the cause of the 

malfunction and the time the malfunction began and ended;

(ii) Corrective actions to be taken in the event of a 

malfunction of a control device or process modification, 

including procedures for recording the actions taken to correct 

the malfunction or minimize emissions; and

(iii) A maintenance schedule for each control device and 

process modification that is consistent with the manufacturer's 

instructions and recommendations for routine and long-term 

maintenance.
(2) The owner or operator shall also keep records of each 

event as required by §63.10(b) of this part and record and 

report if an action taken during a startup, shutdown, or 

malfunction is not consistent with the procedures in the plan as 

described in §63.10(e)(3)(iv) of this part.

(d) Recordkeeping. (1) As required by §63.10(b) of this 

part, the owner or operator shall maintain files of all 

information (including all reports and notifications) required 

by the general provisions and this subpart:

(i) The owner or operator must retain each record for at 

least 5 years following the date of each occurrence, 

measurement, maintenance, corrective action, report, or record. 

The most recent 2 years of records must be retained at the 

facility. The remaining 3 years of records may be retained off

site;

(ii) The owner or operator may retain records 

electronically, on a computer or labeled computer disks, or on 

paper; and

(iii) The owner or operator may report required information 

on paper or on a labeled computer disk using commonly available 

and EPA-compatible computer software. Electronic notifications 

are encouraged when possible.
(2) In addition to the general records required by 

§63.10(b)(2) of this part, the owner or operator shall maintain 

records of the following information:

(i) Any bag leak detection system alarms, including the 

date and time of the alarm, when corrective actions were 

initiated, the cause of the alarm, an explanation of the 

corrective actions taken, and when the cause of the alarm was 

corrected;

(ii) ESP parameter value(s) used to monitor ESP 

performance, including any period when the value(s) deviated 

from the established limit(s), the date and time of the 

deviation, when corrective actions were initiated, the cause of 

the deviation, an explanation of the corrective actions taken, 

and when the cause of the deviation was corrected;

(iii) Air temperature above the molten glass in an 

uncontrolled cold top electric furnace, including any period 

when the temperature exceeded 120 °C (250 °F) at a location 46 

to 61 centimeters (18 to 24 inches) above the molten glass 

surface, the date and time of the exceedance, when corrective 

actions were initiated, the cause of the exceedance, an 

explanation of the corrective actions taken, and when the cause 

of the exceedance was corrected;

(iv) Uncontrolled glass-melting furnace (that is not a cold 

top electric furnace) parameter value(s) used to monitor furnace 
performance, including any period when the value(s) exceeded the 

established limit(s), the date and time of the exceedance, when 

corrective actions were initiated, the cause of the exceedance, 

an explanation of the corrective actions taken, and when the 

cause of the exceedance was corrected;

(v) The formulation of each binder batch and the LOI and 

density for each product manufactured on a rotary spin 

manufacturing line or flame attenuation manufacturing line 

subject to the provisions of this subpart, and the free 

formaldehyde content of each resin shipment received and used in 

the binder formulation;

(vi) Process parameter level(s) for RS and FA manufacturing 

lines that use process modifications to comply with the emission 

limits, including any period when the parameter level(s) 

deviated from the established limit(s), the date and time of the 

deviation, when corrective actions were initiated, the cause of 

the deviation, an explanation of the corrective actions taken, 

and when the cause of the deviation was corrected;

(vii) Scrubber pressure drop, scrubbing liquid flow rate, 

and any chemical additive (including chemical feed rate to the 

scrubber), including any period when a parameter level(s) 

deviated from the established limit(s), the date and time of the 

deviation, when corrective actions were initiated, the cause of 
the deviation, an explanation of the corrective actions taken, 

and when the cause of the deviation was corrected;

(viii) Incinerator operating temperature and results of 

periodic inspection of incinerator components, including any 

period when the temperature fell below the established average 

or the inspection identified problems with the incinerator, the 

date and time of the problem, when corrective actions were 

initiated, the cause of the problem, an explanation of the 

corrective actions taken, and when the cause of the problem was 

corrected;

(ix) Glass pull rate, including any period when the pull 

rate exceeded the average pull rate established during the 

performance test by more than 20 percent, the date and time of 

the exceedance, when corrective actions were initiated, the 

cause of the exceedance, an explanation of the corrective 

actions taken, and when the cause of the exceedance was 

corrected.

(x) You must report total chromium and hexavalent chromium 

emissions from glass-melting furnaces using Method 0061. 

(e) Excess emissions report. As required by §63.10(e)(3)(v) 

of this part, the owner or operator shall report semiannually if 

measured emissions are in excess of the applicable standard or a 

monitored parameter deviates from the levels established during 

the performance test. The report shall contain the information 
specified in §63.10(c) of this part as well as the additional 

records required by the recordkeeping requirements of paragraph 

(d) of this section. When no deviations have occurred, the owner 

or operator shall submit a report stating that no excess 

emissions occurred during the reporting period.

(f)(1) As of January 1, 2012 and within 60 days after the 

date of completing each performance test, as defined in §63.2, 

and as required in this subpart, you must submit performance 

test data, except opacity data, electronically to the EPA’s 

Central Data Exchange by using the ERT (see 

http://www.epa.gov/ttn/chief/ert/erttool.html/) or other 

compatible electronic spreadsheet. Only data collected using 

test methods compatible with ERT are subject to this requirement 

to be submitted electronically into the EPA’s WebFIRE database.

(2) All reports required by this subpart not subject to the 

requirements in paragraph (f)(1) of this section must be sent to 

the Administrator at the appropriate address listed in §63.13. 

If acceptable to both the Administrator and the owner or 

operator of a source, these reports may be submitted on 

electronic media. The Administrator retains the right to require 

submittal of reports subject to paragraph (f)(1) of this section 

in paper format. 

(g) Affirmative Defense for Exceedance of Emission Limit 

During Malfunction. In response to an action to enforce the 
standards set forth in this subpart, you may assert an 

affirmative defense to a claim for civil penalties for 

exceedances of such standards that are caused by malfunction, as 

defined at §63.2. Appropriate penalties may be assessed, 

however, if you fail to meet your burden of proving all of the 

requirements in the affirmative defense. The affirmative defense 

must not be available for claims for injunctive relief.

(1) To establish the affirmative defense in any action to 

enforce such a limit, you must timely meet the notification 

requirements in §63.1386 of this subpart, and must prove by a 

preponderance of evidence that:

(i) The excess emissions: 

(A) Were caused by a sudden, infrequent, and unavoidable 

failure of air pollution control and monitoring equipment, 

process equipment, or a process to operate in a normal or usual 

manner; and

(B) Could not have been prevented through careful planning, 

proper design or better operation and maintenance practices; and 

(C) Did not stem from any activity or event that could have 

been foreseen and avoided, or planned for; and

(D) Were not part of a recurring pattern indicative of 

inadequate design, operation, or maintenance.

(ii) Repairs were made as expeditiously as possible when 

the applicable emissions limitations were being exceeded. Off-
shift and overtime labor were used, to the extent practicable to 

make these repairs; and

(iii) The frequency, amount and duration of the excess 

emissions (including any bypass) were minimized to the maximum 

extent practicable during periods of such emissions; and

(iv) If the excess emissions resulted from a bypass of 

control equipment or a process, then the bypass was unavoidable 

to prevent loss of life, personal injury, or severe property 

damage; and

(v) All possible steps were taken to minimize the impact of 

the excess emissions on ambient air quality, the environment and 

human health; and

(vi) All emissions monitoring and control systems were kept 

in operation if at all possible, consistent with safety and good 

air pollution control practices; and

(vii) All of the actions in response to the excess 

emissions were documented by properly signed, contemporaneous 

operating logs; and 

(viii) At all times, the affected source was operated in a 

manner consistent with good practices for minimizing emissions; 

and

(ix) A written root cause analysis has been prepared, the 

purpose of which is to determine, correct, and eliminate the 

primary causes of the malfunction and the excess emissions 
resulting from the malfunction event at issue. The analysis must 

also specify, using best monitoring methods and engineering 

judgment, the amount of excess emissions that were the result of 

the malfunction. 

(2) Notification. The owner or operator of the affected 

source experiencing an exceedance of its emissions limit(s) 

during a malfunction, must notify the Administrator by telephone 

or facsimile transmission as soon as possible, but no later than 

two business days after the initial occurrence of the 

malfunction, if he/she wishes to be able to use an affirmative 

defense to civil penalties for that malfunction. The owner or 

operator seeking to assert an affirmative defense must also 

submit a written report to the Administrator within 45 days of 

the initial occurrence of the exceedance of the standards in 

this subpart. This report must demonstrate that the 

owner/operator has met the requirements set forth in paragraph 

(g) of this section and must include all necessary supporting 

documentation. The owner or operator may seek an extension of 

this deadline for up to 30 additional days by submitting a 

written request to the Administrator before the expiration of 

the 45 day period. Until a request for an extension has been 

approved by the Administrator, the owner or operator is subject 

to the requirement to submit such report within 45 days of the 

initial occurrence of the exceedance.
[64 FR 31709, June 14, 1999, as amended at 71 FR 20460, Apr. 20, 

2006]

§63.1387 Compliance dates.

(a) Compliance dates. The owner or operator subject to the 

provisions of this subpart shall demonstrate compliance with the 

requirements of this subpart by no later than:

(1) Except as noted in paragraph (2) of this section, the 

compliance date for an owner or operator of an existing plant or 

source subject to the provisions in this subpart is [INSERT DATE 

OF PUBLICATION OF THE FINAL RULE IN THE FEDERAL REGISTER].

(2) The compliance dates for existing plants and sources 

are: 

(i) [INSERT DATE 1 YEAR AFTER PUBLICATION OF THE FINAL RULE 

IN THE FEDERAL REGISTER] for glass-melting furnaces, rotary spin 

manufacturing lines, or flame attenuation manufacturing lines 

subject to emission limits in §63.1382(a) which became effective 

[INSERT DATE OF PUBLICATION OF THE FINAL RULE IN THE FEDERAL 

REGISTER].

(ii) [INSERT DATE OF PUBLICATION OF THE FINAL RULE IN THE 

FEDERAL REGISTER] for the provisions related to malfunctions and 

affirmative defense provisions of §63.1386(g) and the electronic 

reporting provisions of §63.1386(d) and (f).

(b) Compliance extension. The owner or operator of an 

existing source subject to this subpart may request from the 
Administrator an extension of the compliance date for the 

emission standards for one additional year if such additional 

period is necessary for the installation of controls. The owner 

or operator shall submit a request for an extension according to 

the procedures in §63.6(i)(3) of this part.

§63.1388 Startups and shutdowns.

(a) The provisions set forth in this subpart apply at all 

times.

(b) The owner or operator must not shut down items of 

equipment that are required or utilized for compliance with the 

provisions of this subpart during times when emissions are being 

routed to such items of equipment, if the shutdown would 

contravene requirements of this subpart applicable to such items 

of equipment. This paragraph does not apply if the owner or 

operator must shut down the equipment to avoid damage due to a 

contemporaneous startup or shutdown, of the affected source or a 

portion thereof.

(c) Table 1 to subpart NNN summarizes the emissions limits 

during startups and shutdowns of glass-melting furnaces.

Table 1 to Subpart NNN-Emissions limits During Startups and 

Shutdowns of Glass-Melting Furnaces (lb/hr)

Pollutant

Existing 

Furnaces

New and 

Reconstructed 

Furnaces

PM 0.25 0.033

Chromium 0.0019 0.0019
Compounds

HF 0.036 0.014

HCl 0.026 0.014

(d) Table 2 to subpart NNN summarizes the emissions limits 

during startups and shutdowns of rotary spin (RS) manufacturing 

lines.

Table 2 to Subpart NNN-Emissions limits During Startups and 

Shutdowns of Rotary Spin (RS) Manufacturing Lines (lb/hr)

Pollutant

Existing RS 

Lines

New and 

Reconstructed RS 

Lines

Formaldehyde 3.1 0.36

Phenol 3.4 0.019

Methanol 8.8 0.012

(e) Table 3 to subpart NNN summarizes the emissions limits 

during startups and shutdowns of flame attenuation (FA) 

manufacturing lines.

Table 3 to Subpart NNN-Emissions limits During Startups and 

Shutdowns of Flame Attenuation (FA) Manufacturing Lines (lb/hr)

Pollutant

Existing FA 

Lines

New and 

Reconstructed FA 

Lines

Formaldehyde 100 60

Phenol 25 8

Methanol 9 9
[68 FR 37358, June 23, 2003]

§§63.1389-63.1399 [Reserved]

Table 4 to Subpart NNN of Part 63—Applicability of General 

Provisions (40 CFR Part 63, Subpart A) to Subpart NNN

General provisions 

citation

Applies to

subpart NNN Explanation

63.1 Yes.

63.2 Yes

Additional 

definitions in 

§63.1381.

63.3 Yes.

63.4 Yes.

63.5 Yes.

63.5(a), (b), (c) Yes.

63.5(d) No. [Reserved].

63.6(e)(1)(i) No

See §63.1382 for 

general duty 

requirements.

63.6(e)(1)(ii) No.

63.6(e)(1)(iii) Yes.

63.6(e)(2) No

63.6(e)(3) No

63.6(f)(1) No

63.6(g) Yes.

63.6(h) No

Subpart NNN-no COMS, 

VE or opacity 

standards.

63.6(i) Yes.

63.6(j) Yes.

§63.7(a) – (d) Yes.

§63.1384 has specific 

requirements.

63.7(e)(1) No.

§63.7(e)(2)-(e)(4) Yes.
General provisions 

citation

Applies to

subpart NNN Explanation

63.7(f), (g), (h) Yes.

63.8(a) – (b) Yes.

63.8(c)(1)(i) No

See §63.1382(b) for 

general duty 

requirement.

63.8(c)(1)(ii) Yes.

63.8(c)(1)(iii) No

63.8(c)(2) -

(d)(2) Yes.

63.8(d)(3)

Yes, except 

for the last 

sentence.

63.8(e) – (g) Yes.

63.9(a), (b), (c),

(e), (g),

(h)(1)through (3), 

(h)(5) and (6), 

(i) and (j)

Yes.

63.9(f) No Opacity/VE tests not 

required.

63.9(h)(4) No [Reserved].

63.10(a) Yes.

63.10(b)(1) Yes.

63.10(b)(2)(i) No

63.10(b)(2)(ii) No

See 63.1386 for 

recordkeeping of 

occurrence and 

duration of 

malfunctions and 

recordkeeping of 

actions taken during 

malfunction.

63.10(b)(2)(iii) Yes.

63.10(b)(2)(iv)-

(b)(2)(v) No
General provisions 

citation

Applies to

subpart NNN Explanation

63.10(b)(2)(vi)-

(b)(2)(xiv) Yes.

63.10(b)(3) Yes.

63.10(c)(1) – (9) Yes.

63.10(c)(10)–(11) No.

See 63.1386 for 

recordkeeping of 

malfunctions.

63.10(c)(12)-

(c)(14) Yes.

63.10(c)(15) No

63.10(d)(1) – (4) Yes.

63.10(d)(5) No.

See 63.1386(c)(2) for 

reporting of 

malfunctions.

63.10(e) – (f) Yes.

63.11 No

Flares will not be 

used to comply with 

the emissions limits.

63.12 to 63.15 Yes.
Appendix A to Subpart NNN of Part 63—Method for the 

Determination of LOI

1. Purpose

The purpose of this test is to determine the LOI of cured 

blanket insulation. The method is applicable to all cured board 

and blanket products.

2. Equipment

2.1 Scale sensitive to 0.1 gram.

2.2 Furnace designed to heat to at least 540 °C (1,000 °F) and 

controllable to ±10 °C (50 °F).

2.3 Wire tray for holding specimen while in furnace.

3. Procedure

3.1 Cut a strip along the entire width of the product that will 

weigh at least 10.0 grams. Sample should be free of dirt or 

foreign matter.

Note: Remove all facing from sample.

3.2 Cut the sample into pieces approximately 12 inches long, 

weigh to the nearest 0.1 gram and record. Place in wire tray. 

Sample should not be compressed or overhang on tray edges.

Note: On air duct products, remove shiplaps and overspray.

3.3 Place specimen in furnace at 540 °C (1,000 °F), ±10 °C (50 

°F) for 15 to 20 minutes to insure complete oxidation. After 

ignition, fibers should be white and should not be fused 

together.

3.4 Remove specimen from the furnace and cool to room 

temperature.

3.5 Weigh cooled specimen and wire tray to the nearest 0.1 

gram. Deduct the weight of the wire tray and then calculate the 

loss in weight as a percent of the original specimen weight.
Appendix B to Subpart NNN of Part 63—Free Formaldehyde Analysis 

of Insulation Resins by Hydroxylamine Hydrochloride

1. Scope

This method was specifically developed for water-soluble 

phenolic resins that have a relatively high free-formaldehyde 

(FF) content such as insulation resins. It may also be suitable 

for other phenolic resins, especially those with a high FF 

content.

2. Principle

2.1 a. The basis for this method is the titration of the 

hydrochloric acid that is liberated when hydroxylamine 

hydrochloride reacts with formaldehyde to form formaldoxine:

HCHO + NH2OH:HCl → CH2:NOH + H2O + HCl

b. Free formaldehyde in phenolic resins is present as 

monomeric formaldehyde, hemiformals, polyoxymethylene 

hemiformals, and polyoxymethylene glycols. Monomeric 

formaldehyde and hemiformals react rapidly with hydroxylamine 

hydrochloride, but the polymeric forms of formaldehyde must 

hydrolyze to the monomeric state before they can react. The 

greater the concentration of free formaldehyde in a resin, the 

more of that formaldehyde will be in the polymeric form. The 

hydrolysis of these polymers is catalyzed by hydrogen ions.
2.2 The resin sample being analyzed must contain enough 

free formaldehyde so that the initial reaction with 

hydroxylamine hydrochloride will produce sufficient hydrogen 

ions to catalyze the depolymerization of the polymeric 

formaldehyde within the time limits of the test method. The 

sample should contain approximately 0.3 grams free formaldehyde 

to ensure complete reaction within 5 minutes.

3. Apparatus

3.1 Balance, readable to 0.01 g or better.

3.2 pH meter, standardized to pH 4.0 with pH 4.0 buffer 

and pH 7 with pH 7.0 buffer.

3.3 50-mL burette for 1.0 N sodium hydroxide.

3.4 Magnetic stirrer and stir bars.

3.5 250-mL beaker.

3.6 50-mL graduated cylinder.

3.7 100-mL graduated cylinder.

3.8 Timer.

4. Reagents

4.1 Standardized 1.0 N sodium hydroxide solution.

4.2 Hydroxylamine hydrochloride solution, 100 grams per 

liter, pH adjusted to 4.00.

4.3 Hydrochloric acid solution, 1.0 N and 0.1 N.

4.4 Sodium hydroxide solution, 0.1 N.
4.5 50/50 v/v mixture of distilled water and methyl 

alcohol.

5. Procedure

5.1 Determine the sample size as follows:

a. If the expected FF is greater than 2 percent, go to Part 

A to determine sample size.

b. If the expected FF is less than 2 percent, go to Part B 

to determine sample size.

c. Part A: Expected FF ≥ 2 percent.

Grams resin = 60/expected percent FF

i. The following table shows example levels:

Expected % free 

formaldehyde

Sample size, 

grams

2 30.0

5 12.0

8 7.5

10 6.0

12 5.0

15 4.0

ii. It is very important to the accuracy of the results 

that the sample size be chosen correctly. If the milliliters of 

titrant are less than 15 mL or greater than 30 mL, reestimate 

the needed sample size and repeat the tests.

d. Part B: Expected FF < 2 percent
Grams resin = 30/expected percent FF

i. The following table shows example levels:

Expected % free 

formaldehyde

Sample size, 

grams

2 15

1 30

0.5 60

ii. If the milliliters of titrant are less than 5 mL or 

greater than 30 mL, reestimate the needed sample size and repeat

the tests.

5.2 Weigh the resin sample to the nearest 0.01 grams into 

a 250-mL beaker. Record sample weight.

5.3 Add 100 mL of the methanol/water mixture and stir on a 

magnetic stirrer. Confirm that the resin has dissolved.

5.4 Adjust the resin/solvent solution to pH 4.0, using the 

prestandardized pH meter, 1.0 N hydrochloric acid, 0.1 N 

hydrochloric acid, and 0.1 N sodium hydroxide.

5.5 Add 50 mL of the hydroxylamine hydrochloride solution, 

measured with a graduated cylinder. Start the timer.

5.6 Stir for 5 minutes. Titrate to pH 4.0 with 

standardized 1.0 N sodium hydroxide. Record the milliliters of 

titrant and the normality.
6. Calculations

grams of sample

mL sodium hydroxide noramality FF 3.003 % 



7. Method Precision and Accuracy

Test values should conform to the following statistical 

precision:

Variance = 0.005

Standard deviation = 0.07

95% Confidence Interval, for a single determination = 0.2

8. Author

This method was prepared by K. K. Tutin and M. L. Foster, 

Tacoma R&D Laboratory, Georgia-Pacific Resins, Inc. (Principle 

written by R. R. Conner.)

9. References

9.1 GPAM 2221.2.

9.2 PR&C TM 2.035.

9.3 Project Report, Comparison of Free Formaldehyde 

Procedures, January 1990, K. K. Tutin.
Appendix C to Subpart NNN of Part 63—Method for the 

Determination of Product Density

1. Purpose

The purpose of this test is to determine the product 

density of cured blanket insulation. The method is applicable to 

all cured board and blanket products.

2. Equipment

One square foot (12 in. by 12 in.) template, or templates 

that are multiples of one square foot, for use in cutting 

insulation samples.

3. Procedure

3.1 Obtain a sample at least 30 in. long across the 

machine width. Sample should be free of dirt or foreign matter.

3.2 Lay out the cutting pattern according to the plant's 

written procedure for the designated product.

3.2 Cut samples using one square foot (or multiples of one 

square foot) template.

3.3 Weigh product and obtain area weight (lb/ft2 ).

3.4 Measure sample thickness.

3.5 Calculate the product density:

Density (lb/ft3 ) = area weight (lb/ft2 )/thickness (ft)