Approvals: 1st Level 2nd Level 3rd Level 

National Institute for Occupational Safety and Health 

National Personal Protective Technology Laboratory 

P.O. Box 18070 

Pittsburgh, PA 15236 

Procedure No. CET-APRS-STP-0316 Revision: 1.1 Date: 24 October 2005

DETERMINATION OF HAZE AND LUMINOUS TRANSMITTANCE PROPERTIES AND 

ABRASION RESISTANCE PROPERTIES ON THE PRIMARY LENS SYSTEM MATERIAL 

FOR FULL FACEPIECE RESPIRATORY PROTECTIVE DEVICES (RPD) STANDARD 

TEST PROCEDURE (STP) 

1. PURPOSE

1.1. The purpose of this test is to quantify the haze and luminous transmittance (LT) 

and abrasion resistance properties of the primary lens system material of a full 

facepiece RPD. 

1.2. This procedure incorporates the applicable provisions of American Society for 

Testing and Materials (ASTM) test methods ASTM D 1003-00, Standard Test 

Method for Haze and Luminous Transmittance of Transparent Plastics and ASTM 

D 1044-99, Standard Test Method for Resistance of Transparent Plastics to 

Surface Abrasion. This procedure describes the method to test the material that is 

used in the actual full facepiece RPD with either a primary single visor-type lens 

or a dual primary eyepiece lens system. 

1.3. The identified ASTM test methods provide additional detailed procedures used in 

this STP. Lens material test specimens will not be taken from the facepiece but 

will be independently provided in specific dimension plaques from the applicant. 

1.4. The test requirements in this procedure take precedence over the requirements 

stated in ASTM D 1003-00 and ASTM D 1044-99. However, additional details of 

specific methods and parameters not provided in this STP are available in ASTM

D 1003-00, Standard Test Method for Haze and Luminous Transmittance of 

Transparent Plastics and ASTM D 1044-99, Standard Test Method for Resistance 

of Transparent Plastics to Surface Abrasion. These two test methods must be 

available to conduct the test.

Uncontrolled Copy 

 Uncontrolled Copy 

Uncontrolled Copy 

 Uncontrolled Copy 

Uncontrolled Copy 

 Uncontrolled Copy 

Uncontrolled Copy 

 Uncontrolled Copy 
Procedure No. CET-APRS-STP-0316 Revision: 1.1 Date: 24 October 2005 Page 2 of 20 

2. GENERAL

This STP describes the determination of haze and luminous transmittance (LT) properties 

and abrasion resistance properties on the primary lens system material for full facepiece 

respiratory protective devices (RPD) test in sufficient detail that a person knowledgeable 

in the appropriate technical field can conduct the test and determine whether or not the 

product meets the test requirements. 

3. EQUIPMENT.

3.1. Test equipment. 

3.1.1. Taber Abrasive Machine or equivalent. Figure 1 illustrates a Taber, Model 

5130 with a modified vacuum pickup nozzle (11mm nozzle openings), 

including the applicable weights and CS-10F (Type IV) abrasive wheels. 

3.1.1.1 CS-10F (type IV) abrading wheels are described as brown in color, 

‘Easy Glide’ plastic hub, label including print area for lot code and 

expiration date, and identified by production lots that begin with 

the letters: AT, AW, AX, AY, AZ, BA ... 

Figure 1. Taber Abrasive Machine. 

3.1.2. Haze-gard Hazemeter or equivalent. Figure 2 illustrates a BYK-Gardner, 

Model HB-4727 and the mounted Taber Abrasion Holder (BYK-Gardner, 

Model EA-HB-4735). 

Uncontrolled Copy 

 Uncontrolled Copy 

Uncontrolled Copy 

 Uncontrolled Copy 

Uncontrolled Copy 

 Uncontrolled Copy 

Uncontrolled Copy 

 Uncontrolled Copy 
Procedure No. CET-APRS-STP-0316 Revision: 1.1 Date: 24 October 2005 Page 3 of 20 

 Figure 2. Hazemeter. 

3.1.3. Taber Abrasion Holder (BYK-Gardner, Model EA-HB-4735). This holder 

is used exclusively with the BYK-Gardner, Haze-Gard Hazemeter model 

to stabilize the lens test specimen while obtaining test readings. If an 

equivalent is found it may be substituted. Figure 3 illustrates the Taber 

Abrasion Holder from BYK-Gardner (Model EA-HB-4735) 

 Figure 3. Taber Abrasion Holder. 

3.1.4. .8 mm (1/32”) Gap tester, feeler gauge, gage pin, or equivalent. (photo not 

available) 

Uncontrolled Copy 

 Uncontrolled Copy 

Uncontrolled Copy 

 Uncontrolled Copy 

Uncontrolled Copy 

 Uncontrolled Copy 

Uncontrolled Copy 

 Uncontrolled Copy 
Procedure No. CET-APRS-STP-0316 Revision: 1.1 Date: 24 October 2005 Page 4 of 20 

3.1.5. Velvet cloth or equivalent. Work station must have two pieces of velvet 

cloth or equivalent to prevent marring or scratching of the test specimen 

during handling. Cloth material should not add additional abrasion to lens 

specimens in any manner and should be replaceable as required to prevent 

surface abrasion. Two separate cloths are recommended: one for the unabraded specimens and one for the abraded specimens. The abraded 

specimens will eventually accumulate left over abrasion residue, so 

frequent inspection is required for replacement. 

3.1.6. Soft bristle, anti-static brush or equivalent. 

3.1.7. Laboratory test facility: Laboratory test facility must be capable of 

achieving, maintaining and verifying the required standard temperature 

and humidity test conditions. The standard temperature and relative 

humidity (RH) test conditions are 23 +/- 2 o

C (73.4 +/- 3.6 oF) and 50 +/- 

5% RH, respectively, as prescribed by ASTM D 1003-00 and ASTM D 

1044-99. 

4. TESTING REQUIREMENTS AND CONDITIONS

4.1. Prior to beginning any testing, all measuring equipment and instruments to be 

used must have been calibrated using a method traceable to the National Institute 

of Standards and Technology (NIST) in accordance with the manufacturer's 

calibration procedure and schedule. 

4.2. If the applicant desires for a particular cleaning method to be used to clean the 

specimens after they are abraded and before obtaining post abrasion LT and haze 

values, then the applicant shall have provided the cleaning method and any 

cleaning detergent with the test specimens for it to be used during the test; 

however, this cleaning method and detergent must be the same as what is 

recommended in the applicant’s RPD User’s Instructions. If the applicant does not 

provide a cleaning method or detergent with the test specimens then the 

laboratory specialist will use a soft bristle, antistatic brush to lightly brush off any 

debris adhered to the surface of the test specimen and use an isopropyl alcohol 

soaked lint free cloth to gently wipe both surfaces of the specimen. 

4.3. If the applicant’s User’s Instructions require that an antifogging agent be placed 

on the exterior side of the lens during normal use, the applicant shall have 

provided the antifogging agent and applications instructions of the agent with the 

test specimens. The laboratory specialist shall apply the antifogging agent in 

accordance application instructions prior to any testing. 

4.4. Normal laboratory safety practices must be observed. This includes safety 

precautions described in the current Bruceton Facility’s Laboratory Safety 

Uncontrolled Copy 

 Uncontrolled Copy 

Uncontrolled Copy 

 Uncontrolled Copy 

Uncontrolled Copy 

 Uncontrolled Copy 

Uncontrolled Copy 

 Uncontrolled Copy 
Procedure No. CET-APRS-STP-0316 Revision: 1.1 Date: 24 October 2005 Page 5 of 20 

Manual, site-specific procedures and test equipment manufacturer recommended 

practices that are applicable to local health and safety requirements.

4.4.1. Workbenches must be maintained free of clutter and non-essential test 

equipment. 

4.4.2. Safety eyewear is required to be worn during the abrasion test. 

4.5. All test specimen preconditioning and test equipment used for prescribed testing 

shall be in a laboratory test facility maintained at the standard temperature of 23 

+/- 2 o

C (73.4 +/- 3.6 oF) and RH at 50 +/- 5%. All test specimens shall have been 

preconditioned for a minimum of 40 hours at the standard temperature and RH 

test conditions before conducting any testing prescribed in this STP. 

5. PROCEDURES.

NOTE: Reference Section 3. of this STP for types of test equipment, model numbers and 

manufacturers. For calibration purposes, use those described in the manufacturer's 

operation and maintenance manuals. 

5.1 General. 

This procedure describes the haze, luminous transmittance and abrasion resistance 

test for the primary lens system. This procedure describes the required sample 

size, test equipment, test procedure, data collection methods and the pass/fail 

criteria for the Statement of Standard for Chemical, Biological, Radiological and 

Nuclear (CBRN) Full Facepiece Air-Purifying Respirator (APR), 7 March 2003, 

up to Revision 2; April 4, 2003. 

5.2. Test Items/Specimens. 

5.2.1. Test items. 

Indicate, on test data sheet 1 of 4, the following general pretest incoming 

inspection information about the specimens: 

- NIOSH application number (TN): 

- Name of RPD manufacturer : 

- Model number of RPD: 

- Date tested: 

- Condition of the six (6) specimens upon initiation of test: 

- Initial observed physical anomalies such as unclear specimens, crushed etc. 

5.2.2. Test specimen quantity and configuration. 

Uncontrolled Copy 

 Uncontrolled Copy 

Uncontrolled Copy 

 Uncontrolled Copy 

Uncontrolled Copy 

 Uncontrolled Copy 

Uncontrolled Copy 

 Uncontrolled Copy 
Procedure No. CET-APRS-STP-0316 Revision: 1.1 Date: 24 October 2005 Page 6 of 20 

Six specimens shall be used for haze and luminous transmittance 

assessment and the abrasion tests. The applicant shall submit three (3) 

specimens un-abraded and three (3) specimens abraded in accordance with 

the procedures prescribed by ASTM D 1044-99, the NIOSH applicable 

statement of standard and this STP. The test specimens shall be flat, 4-inch 

(102 mm) planar squares as prescribed by ASTM D 1044-99 and this STP. 

They shall be the same material and have the same nominal thickness and 

within the tolerance range as the primary lens (viewing area directly in 

front of the eyes) of the RPD under consideration for certification. The 

three (3) un-abraded specimens shall first be tested for haze and luminous 

transmittance properties and then be tested for abrasion resistance. The 

three (3) abraded test specimens submitted by the applicant are used as 

abrasion control samples and will only be tested for haze and luminous 

transmittance if directed by the Respirator Branch Chief. If they are to be 

tested for haze and LT, they shall be numbered prescribed by the 

procedures defined in Section 5.2.3.2; otherwise, they shall remain 

packaged, exteriorly labeled and held for safekeeping. 

5.2.3. Individual numbering of test specimens for light transmittance. 

NOTE: Avoid any writing or numbering on the area that will become the 

abrasion track. 

5.2.3.1. As received un-abraded: Remove all of the un-abraded test 

specimens from the packaging and place them on the velvet cloth 

to prevent marring or scratching while performing the test. 

Number on the exterior surface of each of the (3) un-abraded 

specimens in the upper right hand corner with a 1, 2, or a three, 

respectively. The exterior surface should have been annotated 

with an “E” by the applicant. If the applicant hasn’t annotated 

the exterior surface, select either side to be the exterior surface 

by marking an “E” in the upper left hand corner. If applicant 

hasn’t annotated the specimen using the circular clock method, 

annotate on the exterior surface by the edge of all four sides of 

each specimen the clockwise method of numbering with 12 at the 

top, 3 at the right, 6 at the bottom and 9 at the left respectively as 

illustrated in Figure 6. 

Uncontrolled Copy 

 Uncontrolled Copy 

Uncontrolled Copy 

 Uncontrolled Copy 

Uncontrolled Copy 

 Uncontrolled Copy 

Uncontrolled Copy 

 Uncontrolled Copy 
Procedure No. CET-APRS-STP-0316 Revision: 1.1 Date: 24 October 2005 Page 7 of 20 

Figure 6. Four (4) reading positions/clock method. 

NOTE: Prior to performing the haze and LT testing, all unabraded lens specimens require a minimum of 40 hours of 

conditioning at 23 +/- 2 o

C (73.4 +/- 3.6 oF) and 50 +/- 5% RH, 

respectively, as prescribed by ASTM D 1003-00 and ASTM D 

1044-99.

5.2.3.2. As received abraded: If the abraded specimens are to be tested, 

per direction of Respirator Branch Chief, they shall be removed 

from the packaging and placed on the velvet cloth in preparation 

for numbering. Assign an administration number to the abraded 

test specimens at the bottom of each specimen with a fine tip 

indelible pen/marker using a sequence that can be correlated to 

the NIOSH application number, manufacturer and test specimen 

number. Individually number the abraded test specimens with an 

indelible pen using a sequence that can be correlated to the 

NIOSH application number, manufacturer and test specimen 

number. For example, the number sequence can be “1-A-AP1”, 

“2-A-AP1” and “3-A-AP1” The administrative number “1-AAP1” means test specimen #1, abraded of applicant 1, 

administrative number “2-A-AP1” meaning test specimen #2, 

abraded of applicant 1 and administrative number “3-A-AP1” 

meaning test specimen #3, abraded, of applicant 1. Ensure the 

“E” is visible and legible on these specimens. 

NOTE: Abraded specimens will not be tested for haze and 

luminous transmittance and abrasion in this procedure unless 

directed by the Respirator Brach Chief. If directed, procedures 

4" 

4" 

1⁄4" Center hole 

Specimen #

 12

 3

 6

9

E

Uncontrolled Copy 

 Uncontrolled Copy 

Uncontrolled Copy 

 Uncontrolled Copy 

Uncontrolled Copy 

 Uncontrolled Copy 

Uncontrolled Copy 

 Uncontrolled Copy 
Procedure No. CET-APRS-STP-0316 Revision: 1.1 Date: 24 October 2005 Page 8 of 20 

defined in Section 5.3. of this test procedure shall be followed. 

Immediately after numbering, the abraded test specimens shall be 

carefully repackaged for safekeeping. 

5.3. Perform haze and luminous transmittance tests. 

GENERAL: Haze and luminous transmittance (LT) values shall be obtained on 

three un-abraded test specimens in their original “As Received” condition by 

using the procedures in this specification and Procedure A in ASTM D 1003-00. A 

hazemeter shall be used to obtain the haze value and LT values. Prior to testing, 

the hazemeter shall be calibrated in accordance with the manufacturer’s 

calibration instructions located in the hazemeter’s instruction manual. Baseline 

calibration must be conducted prior to certification testing (operate with no 

sample present to verify reading of 0). If the hazemeter is in continuous use over 

the normal workday, calibrate it every eight (8) hours or at the beginning of each 

test sequence for that day. Calibrate the hazemeter with a calibration haze lens 

and a calibration LT lens that are as close to the haze and LT requirements 

specified in the statement of standard. Repeat Sections 5.3.1. through 5.3.9. for 

each un-abraded test specimen. Record the haze value and luminous transmittance 

value at each location for each specimen on the test data sheet 2 of 4. 

5.3.1. Place the un-abraded test specimen in the Taber Abrasion Holder that is 

mounted on the BYK-Gardner Hazemeter with the specimen numbering in 

the upright position (12 o’clock on top) and facing the light. The first of 

the four (4) readings taken will be in the 3 o’clock position in reference to 

the numbering by way of the positioning of the specimen described in 

Section 5.3.2.1. 

5.3.2. Depress the blue “Operate” button on the Hazemeter to obtain the first 

haze and luminous transmittance values in the 3 o’clock position. Record 

the haze value and luminous transmittance value for the specimen on the 

test data sheet 2 of 4. 

5.3.3. With the specimen still in the Taber Abrasion Holder, rotate the specimen 

90 degrees counter clockwise to the 6 o’clock position by rotating the 

Taber Abrasion Holder bar 90 degrees counter clockwise. 

5.3.4. Depress the blue “Operate” button on the Hazemeter to obtain the second 

haze and luminous transmittance value in the 6 o’clock position. Record 

the haze value and luminous transmittance value for the specimen on the 

test data sheet 2 of 4. 

5.3.5. With the specimen still in the Taber Abrasion Holder, rotate the specimen 

another 90 degrees counter clockwise to the 9 o’clock position by rotating 

Uncontrolled Copy 

 Uncontrolled Copy 

Uncontrolled Copy 

 Uncontrolled Copy 

Uncontrolled Copy 

 Uncontrolled Copy 

Uncontrolled Copy 

 Uncontrolled Copy 
Procedure No. CET-APRS-STP-0316 Revision: 1.1 Date: 24 October 2005 Page 9 of 20 

the Taber Abrasion Holder bar 90 degrees counter clockwise. 

5.3.6. Depress the blue “Operate” button on the Hazemeter to obtain the third 

haze and luminous transmittance value in the 9 o’clock position. Record 

the haze value and luminous transmittance value for the specimen on the 

test data sheet 2 of 4. 

5.3.7. With the specimen still in the Taber Abrasion Holder, rotate the specimen 

another 90 degrees counter clockwise to the 12 o’clock position by 

rotating the Taber Abrasion Holder bar 90 degrees counter clockwise. 

5.3.8. Depress the blue “Operate” button on the Hazemeter to obtain the forth 

haze and luminous transmittance value in the 12 o’clock position. Record 

the haze value and luminous transmittance value for the specimen on the 

test data sheet 2 of 4. 

5.3.9. Remove specimen from the holding area on the Taber Abrasion Holder 

and place it with the numbering face up on the velvet cloth for temporary 

safekeeping. 

5.4. Abrasion Resistance Test Procedures: 

5.4.1. Taber Abrasive Machine Set-Up 

The Taber Abrasion Machine or equivalent as prescribed by ASTM D 1044-99

shall be used to perform the abrasion test on the three (3) un-abraded test 

specimens. The Taber Abrasion Machine set-up requirements not identified in this 

procedure shall be in accordance with requirements of ASTM D-1044-99. 

NOTE: Refer to the primary Statement of Standard for the RPD being tested: 

Loads, abrasive wheels and number of revolutions for conduct of the abrasion test 

may vary per type of RPD in accordance with the particular standard. 

5.4.1.1 LOAD: A 500-gram standard weight load found in the calibrated 

weights kit for the abrader will be applied to each of the two 

arms that hold the abrasive wheel on the Taber Abrasion 

Machine in accordance with the equipment instructions. 

5.4.1.2 CYCLES: The test specimens will be abraded for 70 cycles: 

Preset the Taber Abrasion Machine to perform for 70 cycles in 

accordance with the equipment instructions. 

5.4.1.3 VACUUM SETTINGS: These settings are based on the new 

Uncontrolled Copy 

 Uncontrolled Copy 

Uncontrolled Copy 

 Uncontrolled Copy 

Uncontrolled Copy 

 Uncontrolled Copy 

Uncontrolled Copy 

 Uncontrolled Copy 
Procedure No. CET-APRS-STP-0316 Revision: 1.1 Date: 24 October 2005 Page 10 of 20 

modified vacuum pick-up nozzle with 11mm (0.438 in) 

openings. 1.) Refacing Stone: The vacuum suction setting shall 

be set to 100%, and the vacuum pick-up nozzle shall be located 

1/32 (0.794 mm) - 1/16” (1.588 mm) above the surface of the 

ST-11 refacing stone. Use the Gap Tester to gauge the correct 

distance. 2.) Test Specimen: The vacuum suction setting shall 

be set to 50%, and the vacuum pick-up nozzle shall be located 

1/32 (0.794 mm) - 1/16” (1.588 mm) above the surface of the test 

specimen. Use the Gap Tester to gauge the correct distance. 

5.4.2. Refacing Abrasion Wheels Procedure 

Before performing the abrasion test on each test specimen, the CS-10F 

(Type IV) wheels shall refaced with a ST-11 refacing stone. If a Taber 

abrasion wheels are not used for the abrasion test, refer to the abrasion 

wheel manufacturer’s resurfacing instructions. 

5.4.2.1 Mount the wheels on their respective flange holders, taking care 

not to handle them by their abrasive surfaces. 

5.4.2.2 Select the load to be used (500 grams on each wheel) and affix it 

to the abrader. 

5.4.2.3 Mount an ST-11 refacing stone on the turntable, fine side up, and 

secure using the nut. 

5.4.2.4 Lower the vacuum nozzle and adjust its height to within 0.8 to 

1.6 mm (1/32 to 1/16 in) of the refacing stone. 

5.4.2.5 Set the vacuum suction force to 100. 

5.4.2.6 Lower the arms so the wheels contact the surface of the ST-11 

refacing stone. 

5.4.2.7 Reface the wheels before abrading each specimen for 25 cycles. 

Do not brush or touch the surface of the wheels after they are 

refaced. 

NOTE: The useful life of the ST-11 Refacing Stone has been defined at 

10,000 cycles (approximately 400 refacings of 25 cycles). To monitor 

usage, the label shown below will be included on the bottom of the 

container the product is shipped in. It is suggested that for each refacing, 

one box be checked until all boxes are full. When full, the refacing stone 

should be discarded and replaced. 

Uncontrolled Copy 

 Uncontrolled Copy 

Uncontrolled Copy 

 Uncontrolled Copy 

Uncontrolled Copy 

 Uncontrolled Copy 

Uncontrolled Copy 

 Uncontrolled Copy 
Procedure No. CET-APRS-STP-0316 Revision: 1.1 Date: 24 October 2005 Page 11 of 20 

5.4.3. Performing Abrasion Tests 

NOTE: A thin fin of wheel material may form on the left hand edge of the 

wheel as the main body of the wheel wears down. To remove, gently rub 

the edge of the wheel using your finger. Avoid touching the running 

surface of the wheel. 

5.4.3.1. Conduct tests in the standard laboratory atmosphere of 23 ± 2oC 

(73.4 ± 3.6oF) and 50 ± 5% relative humidity, unless otherwise 

specified in the test method. In case of disagreements, the 

tolerances shall be ± 1oC (± 1.8oF) and ±2% relative humidity. 

5.4.3.2. Reface new CS-10F (Type IV) wheels for 100 cycles and reface 

previously used CS-10F (Type IV) wheels for 25 cycles with a 

ST-11 refacing stone (fine side up, 180 grit). Reface the wheels 

for 25 cycles before abrading each test specimen. In each case, 

brush residue from the refacing stone during the process. 

5.4.3.3. The maximum allowed time between refacing and testing should 

not exceed 2 minutes. 

5.4.3.4. Perform the abrasion test on the three (3) un-abraded test 

specimens in accordance with this procedure. 

5.4.3.5. Mount the pair of “Calibrase” CS-10F (Type IV) wheels to be 

used on their respective flange holders, taking care not to handle 

them by their abrasive surfaces. Select the load to be used (500 

grams on each wheel) and affix it to the abrader. 

Uncontrolled Copy 

 Uncontrolled Copy 

Uncontrolled Copy 

 Uncontrolled Copy 

Uncontrolled Copy 

 Uncontrolled Copy 

Uncontrolled Copy 

 Uncontrolled Copy 
Procedure No. CET-APRS-STP-0316 Revision: 1.1 Date: 24 October 2005 Page 12 of 20 

5.4.3.6. The vacuum suction setting shall be set to 50%, and the vacuum 

pick-up nozzle shall be located 1/32 (0.794 mm) - 1/16” (1.588 

mm) above the surface of the test specimen. Use the Gap Tester 

to gauge the correct distance. 

5.4.3.7. Mount the specimen on the specimen holder and subject it to 

abrasion for 70 cycles. 

5.4.3.8. After subjecting a test specimen to the abrasion test, remove the 

residue from the test specimens using a cleaning method 

recommended by the applicant as stated in the “Reason for 

Application/Section C.9”. Or use a soft bristle, antistatic brush 

to lightly brush off any debris adhered to the surface of the test 

specimen and use an isopropyl alcohol soaked lint free cloth to 

gently wipe both surfaces of the specimen. Place the specimen on 

the velvet cloth after cleaning for safekeeping. 

5.4.3.9. Repeat steps 5.4.3.1. and 5.4.3.3. for the remaining two (2) unabraded specimens. 

5.5 Post Abrasion Haze and Luminous Transmittance Test 

After abrading the three test specimens, obtain post haze and luminous 

transmittance values on the specimens. Repeat Sections 5.5.1. through 5.5.9. for 

each post-abraded test specimen. 

5.5.1. Place the post-abraded test specimen in the Taber Abrasion Holder that is 

mounted on the BYK-Gardner Hazemeter with the specimen numbering in 

the upright position (12 o’clock on top) and facing the light source. The 

first of the four (4) readings taken shall be in the 3 o’clock position in 

reference to the numbering by way of the positioning of the specimen 

described in Section 5.2.3.1. 

NOTE: Be sure that specimens numbers are entered consistently as their 

designated number throughout all three test data sheets (Test Specimen #1 

on test data sheet 2 of 4 is Test Specimen #1 on test data sheet 3 of 4 and 

test data sheet 4 of 4) 

5.5.2. Depress the blue “Operate” button on the hazemeter to obtain the first 

haze and luminous transmittance value in the 3 o’clock position. Record 

the haze value for the test specimen in the 3 o’clock position in the “Haze 

(After Abrasion)” column 3 on test data sheet 3 of 4. Record the 

luminous transmittance value for the specimen in the 3 o’clock position in 

Uncontrolled Copy 

 Uncontrolled Copy 

Uncontrolled Copy 

 Uncontrolled Copy 

Uncontrolled Copy 

 Uncontrolled Copy 

Uncontrolled Copy 

 Uncontrolled Copy 
Procedure No. CET-APRS-STP-0316 Revision: 1.1 Date: 24 October 2005 Page 13 of 20 

the “LT (After Abrasion)” column 4 on test data sheet 4 of 4. 

5.5.3. With the test specimen still in the Taber Abrasion Holder, rotate the 

specimen 90 degrees counter clockwise to the 6 o’clock position by 

rotating the Taber Abrasion Holder bar 90 degrees counter clockwise. 

5.5.4. Depress the blue “Operate” button on the hazemeter to obtain the second 

haze and luminous transmittance value in the 6 o’clock position. Record 

the haze value for the test specimen in the 6 o’clock position in the “Haze 

(After Abrasion)” Column 3 on test data sheet 3 of 4. Record the LT 

value for the specimen in the 6 o’clock position in the “LT (After 

Abrasion)” column 4 on test data sheet 4 of 4. 

5.5.5. With the test specimen still in the Taber Abrasion Holder, rotate the 

specimen another 90 degrees counter clockwise to the 9 o’clock position 

by rotating the Taber Abrasion Holder bar 90 degrees counter clockwise. 

5.5.6. Depress the blue “Operate” button on the hazemeter to obtain the third 

Haze and LT value in the 9 o’clock position. Record the haze value for the 

test specimen in the 9 o’clock position in the “Haze (After Abrasion)” 

column 3 on test data sheet 3 of 4. Record the LT value for the specimen 

in the 9 o’clock position in the “LT (After Abrasion)” column 4 on test 

data sheet 4 of 4. 

5.5.7. With the test specimen still in the Taber Abrasion Holder, rotate the 

specimen another 90 degrees counter clockwise to the 12 o’clock position 

by rotating the Taber Abrasion Holder bar 90 degrees counter clockwise. 

5.5.8. Depress the blue “Operate” button on the hazemeter to obtain the fourth 

Haze and LT value in the 12 o’clock position. Record the haze value for 

the test specimen in the 12 o’clock position in the “Haze (After 

Abrasion)” column 3 on test data sheet 3 of 4. Record the LT value for 

the specimen in the 12 o’clock position in the “LT (After Abrasion)” 

column 4 on test data sheet 4 of 4. 

5.5.9. Remove the test specimen from the Taber Abrasion Holder and place it on 

the velvet cloth for temporary safekeeping. 

5.5.10. At the completion of the test, individually assign an administration 

number to each un-abraded (As received) test specimens at the bottom of 

the specimen with a fine tip indelible pen/marker using a sequence that 

can be correlated to the NIOSH application number, manufacturer and test 

specimen number. For example, the numbering sequence can be “1UAP1”, “2-U-AP1” and “3-U-A1”. The administrative number “1U-AP1” 

Uncontrolled Copy 

 Uncontrolled Copy 

Uncontrolled Copy 

 Uncontrolled Copy 

Uncontrolled Copy 

 Uncontrolled Copy 

Uncontrolled Copy 

 Uncontrolled Copy 
Procedure No. CET-APRS-STP-0316 Revision: 1.1 Date: 24 October 2005 Page 14 of 20 

means test specimen # 1, un-abraded of applicant 1, administrative number 

“2-U-AP1” means test specimen # 2, un-abraded of applicant 1 and 

administrative number “3-U-A1” means test specimen # 3, un-abraded, of 

applicant 1. Also, record the administration number of specimen on test 

data sheet 2 of 4 in Column 1 and on test data sheet 3 of 4 and test data 

sheet 4 of 4. 

5.5.11. Upon confirmed completion of the test, ensure all equipment is clean, 

serviceable, covered and secured. Ensure all lens standards and weights 

are locked in a securable location and accounted for prior to departing 

area. 

5.6. Data Analysis 

5.6.1. Calculate the Overall Average original haze value and original luminous 

transmittance value and indicate the values on test data sheet 2 of 4. 

5.6.2. Calculate the Overall Average Increase in Haze on test data sheet 3 of 4

by subtracting the individual original haze value (original obtained from 

Sheet 2 of 4) at each reading position for all specimens from the individual 

post abrasion haze (after abrasion) at each respective reading position for 

all specimens to determine the Haze Increase [subtracted Col 4. from Col. 

3]. If a negative value is attained in any of the reading positions, it is to 

be treated as “no change” and a zero value is to be placed in column 5 for 

that particular reading. Average the 12 “Haze Increase” values (Col.5) to 

determine the Overall Average Increase in Haze.

5.6.3. Calculate the Overall Average Decrease in Luminous Transmittance (LT) 

on test data sheet 4 of 4 by subtracting the individual post abrasion (after 

abrasion) Luminous Transmittance (LT) value at each reading position for 

all specimens from the individual original LT (original value obtained 

from Sheet 2 of 4) at each respective reading position for all specimens to 

determine the LT Decrease [subtracted Col 4. from Col. 3]. If a negative 

value is attained in any of the reading positions, it is to be treated as “no 

change” and a zero value is to be placed in column 5 for that particular 

reading. Average the 12 “LT Decrease” values (Col.5) to determine the 

Overall Average Decrease in Luminous Transmittance (LT).

6. PASS/FAIL CRITERIA 

6.1. The criterion for acceptable performance for meeting the Haze requirement on 

the un-abraded, “As Received” test specimens is as follows:. 

The Overall Average Haze Value shall be 3% or less. 

Uncontrolled Copy 

 Uncontrolled Copy 

Uncontrolled Copy 

 Uncontrolled Copy 

Uncontrolled Copy 

 Uncontrolled Copy 

Uncontrolled Copy 

 Uncontrolled Copy 
Procedure No. CET-APRS-STP-0316 Revision: 1.1 Date: 24 October 2005 Page 15 of 20 

6.2. The criterion for acceptable performance for meeting the Luminous 

Transmittance (LT) requirement on the un-abraded, “As Received” test 

specimens is as follows:. 

The Overall Average Luminous Transmittance (LT) Value shall be 88% or 

greater. 

6.3. The criteria for acceptable performance for meeting the Abrasion Resistance 

requirement is as follows: 

6.3.1. The Overall Average Increase in Haze shall not be greater than 4%. 

6.3.2. The Overall Average Decrease in Luminous Transmittance (LT) shall 

not be greater than 4%. 

Uncontrolled Copy 

 Uncontrolled Copy 

Uncontrolled Copy 

 Uncontrolled Copy 

Uncontrolled Copy 

 Uncontrolled Copy 

Uncontrolled Copy 

 Uncontrolled Copy 
Procedure No. CET-APRS-STP-0316 Revision: 1.1 Date: 24 October 2005 Page 16 of 20 

General Pretest Incoming Inspection Information Data Sheet 

(Test Data Sheet 1 of 4) 

- NIOSH application number (TN): _____________________________________________ 

- Name of RPD manufacturer: _________________________________________________ 

- Model number of RPD: _____________________________________________________ 

- Date tested: _______________________________________________________________ 

- Condition of packaging upon receipt: __________________________________________ 

- Condition of the six (6) specimens upon receipt: _________________________________ 

- Initial observed physical anomalies such as unclear specimens, crushed etc. ___________ 

 ________________________________________________________________________ 

 _________________________________________________________________________ 

 __________________________________________________________________________ 

Uncontrolled Copy 

 Uncontrolled Copy 

Uncontrolled Copy 

 Uncontrolled Copy 

Uncontrolled Copy 

 Uncontrolled Copy 

Uncontrolled Copy 

 Uncontrolled Copy 
Procedure No. CET-APRS-STP-0316 Revision: 1.1 Date: 24 October 2005 Page 17 of 20 

Haze and Luminous Transmittance for the “Original” 

Lens Material for Full Facepiece Respiratory Protective Devices 

(Test Data Sheet 2 of 4)

NIOSH application number: _______________________; Date of testing: _________________ 

Manufacturer of the RPD: _________________________ ______________________________ 

Hazometer Make and S/N: ______________________________________________________ 

Requirement: Luminous Transmittance: The Overall Average Luminous Transmittance (LT) Value 

shall be 88% or greater. 

Haze: The Overall Average Haze Value shall be 3% or less.

Results: 

Haze and Luminous Transmittance for the “Original” Lens Material

Specimen 

Number 

Reading 

Position 

Luminous Transmittance (LT) Haze 

3:00 

6:00 

9:00 

Specimen 1 

Admin # 

12:00 

3:00 

6:00 

9:00 

Specimen 2 

Admin # 

12:00 

3:00 

6:00 

9:00 

Specimen 3 

Admin # 

12:00 

Overall Average Value LT = Haze = 

PASS FAIL 

Comments: ____________________________________

 __________________________________________ ____________

 ___________________________________________________________________ 

Laboratory Specialist Signature: DATE: 

Laboratory Supervisor Signature: DATE: 

Uncontrolled Copy 

 Uncontrolled Copy 

Uncontrolled Copy 

 Uncontrolled Copy 

Uncontrolled Copy 

 Uncontrolled Copy 

Uncontrolled Copy 

 Uncontrolled Copy 
Procedure No. CET-APRS-STP-0316 Revision: 1.1 Date: 24 October 2005 Page 18 of 20 

Abrasion Resistance for Full Facepiece Respiratory Protective Devices 

(Test Data Sheet 3 of 4)

NIOSH application number: ______________________ Dates of testing:________________ 

Manufacturer of the RPD: _______________________________________________________ 

Hazometer Make and S/N: ______________________________________________________ 

Abrasion Machine Make and S/N: _________________________________________________ 

NOTE: Subtract the individual original haze value (original obtained from Sheet 2 of 4) at each reading 

position for all specimens from the individual post abrasion haze (after abrasion) at each respective 

reading position for all specimens to determine the Haze Increase [Subtracted Col 4. from Col. 3]. 

Average the 12 “Haze Increase” values (Col.5) to determine the Overall Average Increase in Haze. 

Requirement: Abrasion resistance. The Overall Average Increase in Haze shall not be greater than 4%. 

Abrasion Resistance: Increase in the Overall Average Haze of Lens Material

Specimen 

Number 

Reading 

Position 

(Col. 3) Haze 

(After Abrasion) 

(Col. 4) Haze (Original 

from Sheet 2 of 6) 

(Col. 5) Haze Increase

* 

3:00 

6:00 

9:00 

Specimen 1 

Admin # 

12:00 

3:00 

6:00 

9:00 

Specimen 2 

Admin # 

12:00 

 

3:00 

6:00 

9:00 

Specimen 3 

Admin # 

12:00 

 Overall Average Increase in Haze = 

* If a negative value is attained in any of the reading positions, it is to be treated as “no change” and a zero value is 

to be placed in column 5 for that particular reading. 

PASS FAIL

Comments: 

 

Laboratory Specialist Signature: DATE: 

Laboratory Supervisor Signature: DATE: 

Uncontrolled Copy 

 Uncontrolled Copy 

Uncontrolled Copy 

 Uncontrolled Copy 

Uncontrolled Copy 

 Uncontrolled Copy 

Uncontrolled Copy 

 Uncontrolled Copy 
Procedure No. CET-APRS-STP-0316 Revision: 1.1 Date: 24 October 2005 Page 19 of 20 

Abrasion Resistance for Full Facepiece Respiratory Protective Devices 

(Test Data Sheet 4 of 4)

NIOSH application number: ______________________________; Date of testing: _________ 

Manufacturer of the RPD: _______________________________________________________ 

Hazometer Make and S/N: ______________________________________________________

Abrasion Machine Make and S/N: _________________________________________________ 

NOTE: Subtract the individual post abrasion (after abrasion) Luminous Transmittance (LT) value at each 

reading position for all specimens from the individual original LT (original value obtained from Sheet 2 

of 4) at each respective reading position for all specimens to determine the LT Decrease [Subtracted Col 

4. from Col. 3].. Average the 12 “LT Decrease” values (Col.5) to determine the Overall Average 

Decrease in Luminous Transmittance (LT).

Requirement: Abrasion resistance. The Overall Average Decrease in Luminous Transmittance (LT)

shall not be greater than 4%.

Abrasion Resistance: Decrease in the Overall Average Luminous Transmittance (LT) 

Specimen 

Number 

Reading 

Position 

(Col 3) LT 

(original from 

Sheet 2 of 6) 

 (Col. 4) LT (After 

Abrasion) 

(Col. 5) LT Decrease 

*

3:00 

6:00 

9:00 

Specimen 1 

Admin # 

12:00 

3:00 

6:00 

9:00 

Specimen 2 

Admin # 

12:00 

3:00 

6:00 

9:00 

Specimen 3 

Admin # 

12:00 

 Overall Average Decrease in Luminous Transmittance (LT) =

* If a negative value is attained in any of the reading positions, it is to be treated as “no change” and a zero value is 

to be placed in column 5 for that particular reading. 

PASS FAIL 

Comments: 

Laboratory Specialist Signature: DATE: 

Laboratory Supervisor Signature: DATE: 

Uncontrolled Copy 

 Uncontrolled Copy 

Uncontrolled Copy 

 Uncontrolled Copy 

Uncontrolled Copy 

 Uncontrolled Copy 

Uncontrolled Copy 

 Uncontrolled Copy 
Procedure No. CET-APRS-STP-0316 Revision: 1.1 Date: 24 October 2005 Page 20 of 20 

Revision History 

Revision Date Reason for Revision 

0.0 7 March 2002 Historic document 

1.0 12 May 2005 Taber Inc. the manufacture of the abrasion equipment initiated 

several equipment design changes. Modifications to the vacuum 

pickup nozzles, vacuum gap, abrasion wheel formula and the lens 

cleaning method as per Taber Inc. required this STP revision. 

1.1 24 October 2005 Update header and format to reflect lab move from Morgantown, 

WV 

No changes to method 

 

Uncontrolled Copy 

 Uncontrolled Copy 

Uncontrolled Copy 

 Uncontrolled Copy 

Uncontrolled Copy 

 Uncontrolled Copy 

Uncontrolled Copy 

 Uncontrolled Copy