Environmental Condition Testing of 31 Sampled Measurement Technology 

Laboratories 46.2-mm PTFE (Teflon®) Filters

Environmental Condition Test

Client: Tennessee Department of Environment and 

Conservation

Leidos/

TDEC Purchase Order No.: P010157692

RTI Project No.: 0212441.001.022

Draft Date: May 20, 2014

Final Date: July 18, 2014

By

Paige Presler-Jur

RTI International1

3040 Cornwallis Road

Research Triangle Park, NC 27709-2194

919-541-6813

Submitted To

Robert Brawner

Technical Services Program

Air Pollution Control Division

15th Floor William R. Snodgrass Tennessee Tower

312 Rosa L. Parks Avenue

Nashville, TN 37243

 

1RTI International is a trade name of Research Triangle Institute.
1

INTRODUCTION

RTI was instructed to perform Environmental Condition testing of Measurement Technology 

Laboratories (MTL) 46.2-mm PTFE (Teflon®) filters. Thirty-one sampled filters were provided for 

the test by the Tennessee State Laboratory. The 31 filters provided for the testing were received 

by RTI on April 17, 2014. RTI suggested a statistically valid number of filters was 30-50 filters 

based on the statistical power analysis for the number of samples needed to be 95% certain a 

difference between the two populations of weighings actually existed (i.e., two different 

environmental conditions). For reference, the EPA acceptance criteria according to standard 

moisture pickup test descriptions outlined in 40 CFR Part 50, Appendix L, and enclosed with the 

filters, a filter’s weight is not to increase by more than 10 μg after 24-hour exposure to air of 

40% relative humidity, relative to its weight after 24-hour exposure to air of 35% relative 

humidity. The sample size was also based on this EPA acceptance criteria that the average at 

the two weights can differ by up 10 ug and still be deemed ‘passing’ the moisture pickup 

acceptance test. TDEC chose to evaluate both relative humidity and temperature by varying the 

environmental conditions to 25% RH and 45% RH as well as 18°C and 25°C.

GRAVIMETRIC ANALYSES

The microanalytical balance used for the moisture pickup test was a Mettler Toledo Model XP6

with a readability of 0.1 μg and a repeatability of 0.25 μg. This balance is installed in the MTL 

AH-225 Precision Weighing System shown in Exhibit 1. All weighings for the Environmental 

Condition Tests were completed by the MTL AH-225 robotic autohandler. 

Exhibit 1. MTL AH-225 Precision Weighing System for Robotic Gravimetry Analysis 

MTL’s AH225 series is an automated filter processing system that vastly increases our throughput 

capabilities while providing greater precision and lower detection limits.

1. Filters were equilibrated and weighed in a controlled-environment weighing chamber 

(seen in Exhibit 2) whose ambient temperature and relative humidity are controlled and 

monitored by a dedicated conditioning, humidification, and dehumidification system. 
2

Exhibit 2. Environmentally Controlled Weighing Chambers 

RTI chamber systems provide optimal conditions and high quality data collection 

for the gravimetric analysis of filter samples.

Filters were placed in the weighing chamber on April 23, 2014, and allowed to equilibrate in the 

weighing environment at 36% relative humidity and 22°C for 24 hours. Pre-test weighing at 

these conditions was performed on April 24, 2014. The chamber’s temperature controls were 

then reset for 18°C. The filters were allowed to equilibrate in the weighing environment at 18°C

temperature and 36% relative humidity for 24 hours, and then were reweighed on April 25, 

2014. At that time, the chamber’s temperature controls were reset for 25°C, and the filters were 

allowed to equilibrate in the weighing environment at 25°C temperature and 36% relative 

humidity for 24 hours. They were reweighed on April 27, 2014. The post test was completed in a

weighing environment of 22°C temperature and 36% relative humidity on April 29, 2014. 

Relative humidity and temperature data were collected for the 24 hours prior to each weigh 

session using both the probe data logger in the MTL AH-225 and a temperature and humidity 

data logger for the chamber that was placed on top of the autohandler (seen in Exhibit 3). Data 

logger outputs were exported into Excel® spreadsheet format for calculation of means and 

standard deviations and for inclusion in this report. The data are provided in Attachment 2.
3

Exhibit 3. Location of the Environmental Condition 

Sensors

Multiple environmental data loggers were used to provide a 

clear illustration of the conditions in the chamber at the MTL 

AH-225.

In between the two weekend tests, the filters were placed in the holding silo of the MTL AH-225 

and kept in the weighing chamber at 36% relative humidity and 22°C for 24 hours. Pre-test 

weighing for the % relative humidity testing was performed at these conditions on May 8, 2014. 

The chamber’s relative humidity controls were then reset for 25% relative humidity. The filters 

were allowed to equilibrate in the weighing environment at 25% relative humidity and 22°C for 

24 hours, and then were reweighed on May 9, 2014. At that time, the chamber’s relative 

humidity controls were reset for 45%, and the filters were allowed to equilibrate in the weighing 

environment at 22°C temperature and 45% relative humidity for 24 hours. They were reweighed 

on May 10, 2014. The post test was completed in a weighing environment of 22°C temperature 

and 36% relative humidity on May 12, 2014. Relative humidity and temperature data were 

collected for the 24 hours prior to each weigh session using both the probe data logger in the 

MTL AH-225 and a temperature and humidity data logger for the chamber that was placed on 

top of the autohandler (seen in Figure 2). Data logger outputs were exported into Excel®

spreadsheet format for calculation of means and standard deviations and for inclusion in this 

report. The data are provided in Attachment 3.

Two NIST-traceable reference weights bracketing the weight of the MTL 46.2 mm PTFE filter 

(100-mg and 400-mg) were weighed after balance start-up and calibration and then again after 

every tenth filter to monitor balance fluctuation in each weigh session. In addition, all filters were

reweighed to monitor filter stability during each weigh session. 
4

RESULTS OF ANALYSES

Weights for the 31 filters for the temperature and relative humidity tests are presented in the 

attached Table 1 and 2, respectively. The internal duplicate QC data are presented with the 

weighing data in Tables 1 and 2 of Attachment 1. Relative Mass Difference is presented in 

Tables 1b and 2b for the temperature and relative humidity, respectively. Internal Environmental 

Chamber Condition QC data are presented in Tables 3 and 4. The QC data includes readings 

from the AH probe sensor. The chamber data logger data is reported for comparison 

Attachments 2 and 3. During the Moisture Pickup Acceptance Tests in previous years, RTI 

noticed that the MTL filters had a tendency to have greater static effects than filters previously 

tested for the program. The MTL AH-225 robotic autohandler is equipped with multiple static 

protections to minimize the effects of static for these Environmental Condition tests. RTI 

invested in the MTL autohandler Faraday pan to substantially reduce the effect of static charge 

on the mass measurement result. The MTL AH-225 is also equipped with multiple Polonium 

strips in the balance weighing chamber. 

DISCUSSION

Attachment 1 Tables 1a and 2a report the filter weighings for each test. Attachment 1 Tables 1b 

and 2b show the mean differences in filter weights recorded for the 31 test filters at the varying 

temperature and humidity settings. There were no net mass differences outside the +/- 30 μg

acceptance for Field Blank weight changes and a limited number of net mass differences 

outside of the +/- 15 μg acceptance for duplicate weights shown in Exhibit 4. 

Exhibit 4. Number of Filters with Relative Mass Differences Outside Field 

Blank and Duplicate Specifications for (a) Temperature and (b) Relative 

Humidity

4a. Corresponds to Mass Difference Attachment 1,Table 1b

Relative 

Mass 

Difference

‘Pre-Test' -

18°C 18°C - 25°C ‘Pre-Test' -25°C 

‘Pre-Test' -

'Post-Test' 

> +30 ug 0 0 0 0

< -30 ug 0 0 0 0

> +15 ug 1 0 1 3

< -15 ug 0 0 0 0

4b. Corresponds to Mass Difference Attachment 1, Table 2b

Relative 

Mass 

Difference

'Pre-Test' -

25% 25% - 45% 'Pre-Test' -45% 

'Pre-Test' -

'Post-Test' 

> +30 ug 1 0 1 1

< -30 ug 0 0 0 0

> +15 ug 1 0 1 1

< -15 ug 0 0 0 0

Relative Mass Difference compared to Acceptance for FRM Field Blanks and 

Duplicates.
5

All replicate weighings of the reference weights and duplicate weighings of the MTL filters were 

within the acceptance ranges set forth in the U.S. EPA Quality Assurance Handbook, Volume II, 

Part II, Section 2.12 (Guidance Document 2.12). The attached data suggest that the sample 

size chosen for the study is sufficient for the purposes of this study. Filter number 14334066 

was a designated Laboratory Blank initiated at the time of the first weigh session and weighed 

at least one time during each consecutive weigh session. There was variation in the 

temperature and humidity readings between MTL AH-225 data logger probe and the chamber 

data loggers as seen in Attachments 2 and 3. Both data loggers are within their annual 

calibration completed by a NIST traceable calibration service. The set points for the relative 

humidity and temperature were taxing to the RTI chamber. Differences in air flow around the 

MTL AH-225 could also have attributed to the slight difference in the readings. Exhibit 3 

provides an image of where the data logger and sensor probe were located during the testing. 

Attachments 2 and 3 show the variation in the data collected from both instruments. The 

conditions were stable in all tests and are believed to be representative of the chosen relative 

humidity and temperatures.
6

Attachment Table 1a

Filter ID 

Number

4/24/14

'Pre-Test'

Initial 

Weight (mg)

22°C

4/24/14 

Duplicate 

(QC Check) 

Weight (mg) 

22°C

4/25/14 

Initial 

Weight (mg) 

18°C

4/25/14 

Duplicate 

(QC Check) 

Weight (mg) 

18°C

4/27/14

Initial 

Weight (mg)

25°C

4/27/14 

Duplicate 

(QC Check) 

Weight (mg) 

25°C

4/29/14

'Post-Test'

Initial 

Weight (mg)

22°C

4/29/14 

Duplicate 

(QC Check) 

Weight (mg) 

22°C

Comments on Filter 

Appearance 

3653876 365.110 365.105 365.105 365.115 365.110 365.107 365.108 365.107

3653892 363.914 363.918 363.916 363.919 363.918 363.919 363.919 363.918

3653893 363.278 363.274 363.272 363.277 363.276 363.275 363.278 363.276

3653971 369.024 369.020 369.020 369.020 369.024 369.021 369.022 369.021

3653978 367.675 367.669 367.669 367.671 367.674 367.670 367.671 367.668

3653991 363.837 363.828 363.826 363.828 363.832 363.830 363.832 363.828

3654152 383.662 383.656 383.651 383.654 383.649 383.647 383.640 383.641

3654236 376.248 376.243 376.242 376.247 376.246 376.241 376.243 376.236

3654293 364.249 364.248 364.247 364.258 364.256 364.251 364.252 364.251

3654389 367.675 367.673 367.667 367.668 367.662 367.66 367.653 367.652

3654394 389.153 389.145 389.138 389.141 389.137 389.136 389.137 389.134

3654396 382.486 382.483 382.484 382.488 382.486 382.488 382.488 382.487

3654398 382.388 382.384 382.381 382.386 382.380 382.378 382.374 382.369

3654400 379.265 379.266 379.260 379.261 379.257 379.256 379.253 379.250

3654492 383.027 383.024 383.026 383.030 383.033 383.028 383.030 383.027

3654497 382.689 382.683 382.684 382.686 382.689 382.684 382.685 382.681

3654510 383.025 383.024 383.017 383.020 383.021 383.018 383.014 383.014

3654602 382.559 382.556 382.563 382.568 382.565 382.563 382.560 382.562

3654625 382.668 382.667 382.662 382.665 382.665 382.663 382.663 382.660

3654639 378.281 378.276 378.272 378.276 378.277 378.272 378.271 378.271

3654689 379.566 379.571 379.566 379.572 379.568 379.563 379.555 379.557

3654706 382.193 382.191 382.188 382.193 382.195 382.191 382.188 382.189

3655556 363.740 363.738 363.730 363.735 363.735 363.732 363.736 363.731

3655567 364.311 364.309 364.311 364.313 364.317 364.312 364.316 364.312

3655570 361.655 361.650 361.650 361.652 361.654 361.651 361.654 361.651

3655588 369.857 369.856 369.855 369.856 369.856 369.856 369.854 369.855

3655706 372.809 372.804 372.802 372.807 372.812 372.805 372.810 372.805

3655721 371.314 371.312 371.301 371.308 371.308 371.305 371.302 371.301

3655772 368.676 368.670 368.669 368.677 368.674 368.672 368.674 368.672

3655787 365.156 365.160 365.155 365.160 365.160 365.158 365.159 365.157

4590651 368.693 368.686 368.683 368.688 368.685 368.686 368.688 368.685

14334066 140.176 140.174 140.176 140.171 140.174 140.176 140.176 N/A

Sampled Measurement Technology Laboratories (MTL) 46.2-mm Teflon Filters

Table 1. Temperature Test Weighing Data
7

Attachment 1 Table 1b

Filter ID 

Number

Relative 

Mass 

Difference 

(Pre-Test - 

18°C) (mg)

Absolute 

Mass 

Difference 

(Pre-Test - 

18°C) (mg)

Relative Mass 

Difference 

(18°C - 25°C) 

(mg)

Absolute 

Mass 

Difference 

(18°C - 25°C) 

(mg)

Relative Mass 

Difference 

(Pre-Test - 

25°C) (mg)

Absolute Mass 

Difference 

(Pre-Test - 

25°C) (mg)

Relative Mass 

Difference 

(Pre-Test - 

Post-Test) 

(mg)

Absolute Mass 

Difference 

(Pre-Test - 

Post-Test) 

(mg)

3653876 0.005 0.005 -0.005 0.005 0.000 0.000 0.002 0.002

3653892 -0.002 0.002 -0.002 0.002 -0.004 0.004 -0.005 0.005

3653893 0.006 0.006 -0.004 0.004 0.002 0.002 0.000 0.000

3653971 0.004 0.004 -0.004 0.004 0.000 0.000 0.002 0.002

3653978 0.006 0.006 -0.005 0.005 0.001 0.001 0.004 0.004

3653991 0.011 0.011 -0.006 0.006 0.005 0.005 0.005 0.005

3654152 0.011 0.011 0.002 0.002 0.013 0.013 0.022 0.022

3654236 0.006 0.006 -0.004 0.004 0.002 0.002 0.005 0.005

3654293 0.002 0.002 -0.009 0.009 -0.007 0.007 -0.003 0.003

3654389 0.008 0.008 0.005 0.005 0.013 0.013 0.022 0.022

3654394 0.015 0.015 0.001 0.001 0.016 0.016 0.016 0.016

3654396 0.002 0.002 -0.002 0.002 0.000 0.000 -0.002 0.002

3654398 0.007 0.007 0.001 0.001 0.008 0.008 0.014 0.014

3654400 0.005 0.005 0.003 0.003 0.008 0.008 0.012 0.012

3654492 0.001 0.001 -0.007 0.007 -0.006 0.006 -0.003 0.003

3654497 0.005 0.005 -0.005 0.005 0.000 0.000 0.004 0.004

3654510 0.008 0.008 -0.004 0.004 0.004 0.004 0.011 0.011

3654602 -0.004 0.004 -0.002 0.002 -0.006 0.006 -0.001 0.001

3654625 0.006 0.006 -0.003 0.003 0.003 0.003 0.005 0.005

3654639 0.009 0.009 -0.005 0.005 0.004 0.004 0.010 0.010

3654689 0.000 0.000 -0.002 0.002 -0.002 0.002 0.011 0.011

3654706 0.005 0.005 -0.007 0.007 -0.002 0.002 0.005 0.005

3655556 0.010 0.010 -0.005 0.005 0.005 0.005 0.004 0.004

3655567 0.000 0.000 -0.006 0.006 -0.006 0.006 -0.005 0.005

3655570 0.005 0.005 -0.004 0.004 0.001 0.001 0.001 0.001

3655588 0.002 0.002 -0.001 0.001 0.001 0.001 0.003 0.003

3655706 0.007 0.007 -0.010 0.010 -0.003 0.003 -0.001 0.001

3655721 0.013 0.013 -0.007 0.007 0.006 0.006 0.012 0.012

3655772 0.007 0.007 -0.005 0.005 0.002 0.002 0.002 0.002

3655787 0.001 0.001 -0.005 0.005 -0.004 0.004 -0.003 0.003

4590651 0.010 0.010 -0.002 0.002 0.008 0.008 0.005 0.005

14334066 0.000 0.000 0.002 0.002 0.002 0.002 0.000 0.000

Relative 

Mass 

Difference 

(Pre-Test - 

18°C) (mg)

Absolute 

Mass 

Difference 

(Pre-Test - 

18°C) (mg)

Relative Mass 

Difference 

(18°C - 25°C) 

(mg)

Absolute 

Mass 

Difference 

(18°C - 25°C) 

(mg)

Relative Mass 

Difference 

(Pre-Test - 

25°C) (mg)

Absolute Mass 

Difference 

(Pre-Test - 

25°C) (mg)

Relative Mass 

Difference 

(Pre-Test - 

Post-Test) 

(mg)

Absolute Mass 

Difference 

(Pre-Test - 

Post-Test) 

(mg)

Mean 0.005(3) 0.005(7) -0.003(3) 0.004(2) 0.002(0) 0.004(5) 0.004(8) 0.006(2)

Min -0.004 0.000 -0.010 0.001 -0.007 0.000 -0.005 0.000

Max 0.015 0.015 0.005 0.010 0.016 0.016 0.022 0.022

Table 1. Temperature Test Mass Difference Calculations

Sampled Measurement Technology Laboratories (MTL) 46.2-mm Teflon Filters
8

Attachment 1 Table 2a

Filter ID 

Number

5/8/14

'Pre-Test'

Initial 

Weight (mg)

36% RH

5/8/14 

Duplicate 

(QC Check) 

Weight (mg) 

36% RH

5/9/14 Initial 

Weight (mg) 

25% RH

5/9/14 

Duplicate 

(QC Check) 

Weight (mg) 

25% RH

5/10/14

Initial 

Weight (mg)

45% RH

5/10/14 

Duplicate 

(QC Check) 

Weight (mg) 

45% RH

5/12/14

'Post Test'

Initial 

Weight (mg)

35% RH

5/12/14 

Duplicate 

(QC Check) 

Weight (mg) 

35% RH

Comments on Filter 

Appearance 

3653876 365.103 365.102 365.102 365.099 365.112 365.103 365.111 365.099

3653892 363.915 363.914 363.913 363.911 363.922 363.915 363.919 363.914

3653893 363.267 363.271 363.270 363.267 363.275 363.271 363.271 363.268

3653971 369.023 369.023 369.022 369.020 369.024 369.024 369.023 369.022

3653978 367.670 367.669 367.666 367.667 367.673 367.669 367.670 367.668

3653991 363.831 363.829 363.829 363.826 363.831 363.831 363.828 363.827

3654152 383.636 383.631 383.629 383.626 383.636 383.632 383.626 383.626

3654236 376.238 376.232 376.232 376.229 376.238 376.235 376.235 376.233

3654293 364.250 364.245 364.245 364.244 364.245 364.247 364.249 364.245

3654389 367.635 367.636 367.630 367.632 367.642 367.639 367.632 367.631

3654394 389.127 389.122 389.120 389.117 389.127 389.126 389.122 389.120

3654396 382.487 382.485 382.482 382.482 382.489 382.486 382.490 382.485

3654398 382.357 382.355 382.349 382.350 382.363 382.358 382.355 382.352

3654400 379.246 379.240 379.234 379.233 379.242 379.241 379.240 379.236

3654492 383.029 383.026 383.024 383.022 383.030 383.026 383.030 383.025

3654497 382.684 382.682 382.682 382.677 382.680 382.681 382.682 382.679

3654510 383.005 383.003 383.002 382.999 383.009 383.007 383.007 383.002

3654602 382.547 382.543 382.539 382.539 382.545 382.542 382.545 382.539

3654625 382.653 382.648 382.646 382.644 382.648 382.647 382.647 382.646

3654639 378.267 378.269 378.271 378.266 378.271 378.270 378.269 378.267

3654689 379.561 379.555 379.555 379.556 379.559 379.556 379.560 379.556

3654706 382.192 382.189 382.151 382.148 382.157 382.153 382.153 382.153

Temperature Test and 

Pre-Test Check 

indicates filter had debris 

that was dislodged after 

this test.

3655556 363.731 363.731 363.729 363.729 363.738 363.731 363.732 363.731

3655567 364.315 364.309 364.312 364.308 364.314 364.310 364.315 364.312

3655570 361.648 361.647 361.649 361.646 361.649 361.651 361.652 361.648

3655588 369.851 369.851 369.851 369.848 369.854 369.853 369.851 369.850

3655706 372.805 372.801 372.799 372.799 372.805 372.801 372.801 372.801

3655721 371.306 371.302 371.307 371.300 371.305 371.302 371.303 371.302

3655772 368.671 368.669 368.670 368.669 368.672 368.671 368.671 368.669

3655787 365.152 365.150 365.149 365.147 365.158 365.150 365.154 365.149

4590651 368.685 368.683 368.688 368.683 368.686 368.683 368.686 368.683

14334066 140.175 140.174 140.175 140.173 140.177 140.176 140.176 140.173

Table 2. % Relative Humidity Test Weighing Data

Sampled Measurement Technology Laboratories (MTL) 46.2-mm Teflon Filters
9

Attachment 1 Table 2b

Filter ID 

Number

Relative 

Mass 

Difference 

(Pre-Test - 

25% RH) (mg)

Absolute 

Mass 

Difference 

(Pre-Test - 

25% RH) (mg)

Relative Mass 

Difference 

(25% RH - 45% 

RH) (mg)

Absolute Mass 

Difference 

(25% RH - 45% 

RH) (mg)

Relative Mass 

Difference (PreTest - 45% RH) 

(mg)

Absolute Mass 

Difference (PreTest - 45% RH) 

(mg)

Relative Mass 

Difference (PreTest - PostTest) (mg)

Absolute 

Mass 

Difference 

(Pre-Test - 

Post-Test) 

(mg)

3653876 0.001 0.001 -0.010 0.010 -0.009 0.009 -0.008 0.008

3653892 0.002 0.002 -0.009 0.009 -0.007 0.007 -0.004 0.004

3653893 -0.003 0.003 -0.005 0.005 -0.008 0.008 -0.004 0.004

3653971 0.001 0.001 -0.002 0.002 -0.001 0.001 0.000 0.000

3653978 0.004 0.004 -0.007 0.007 -0.003 0.003 0.000 0.000

3653991 0.002 0.002 -0.002 0.002 0.000 0.000 0.003 0.003

3654152 0.007 0.007 -0.007 0.007 0.000 0.000 0.010 0.010

3654236 0.006 0.006 -0.006 0.006 0.000 0.000 0.003 0.003

3654293 0.005 0.005 0.000 0.000 0.005 0.005 0.001 0.001

3654389 0.005 0.005 -0.012 0.012 -0.007 0.007 0.003 0.003

3654394 0.007 0.007 -0.007 0.007 0.000 0.000 0.005 0.005

3654396 0.005 0.005 -0.007 0.007 -0.002 0.002 -0.003 0.003

3654398 0.008 0.008 -0.014 0.014 -0.006 0.006 0.002 0.002

3654400 0.012 0.012 -0.008 0.008 0.004 0.004 0.006 0.006

3654492 0.005 0.005 -0.006 0.006 -0.001 0.001 -0.001 0.001

3654497 0.002 0.002 0.002 0.002 0.004 0.004 0.002 0.002

3654510 0.003 0.003 -0.007 0.007 -0.004 0.004 -0.002 0.002

3654602 0.008 0.008 -0.006 0.006 0.002 0.002 0.002 0.002

3654625 0.007 0.007 -0.002 0.002 0.005 0.005 0.006 0.006

3654639 -0.004 0.004 0.000 0.000 -0.004 0.004 -0.002 0.002

3654689 0.006 0.006 -0.004 0.004 0.002 0.002 0.001 0.001

3654706 0.041 0.041 -0.006 0.006 0.035 0.035 0.039 0.039

3655556 0.002 0.002 -0.009 0.009 -0.007 0.007 -0.001 0.001

3655567 0.003 0.003 -0.002 0.002 0.001 0.001 0.000 0.000

3655570 -0.001 0.001 0.000 0.000 -0.001 0.001 -0.004 0.004

3655588 0.000 0.000 -0.003 0.003 -0.003 0.003 0.000 0.000

3655706 0.006 0.006 -0.006 0.006 0.000 0.000 0.004 0.004

3655721 -0.001 0.001 0.002 0.002 0.001 0.001 0.003 0.003

3655772 0.001 0.001 -0.002 0.002 -0.001 0.001 0.000 0.000

3655787 0.003 0.003 -0.009 0.009 -0.006 0.006 -0.002 0.002

4590651 -0.003 0.003 0.002 0.002 -0.001 0.001 -0.001 0.001

14334066 0.000 0.000 -0.002 0.002 -0.002 0.002 -0.001 0.001

Relative 

Mass 

Difference 

(Pre-Test - 

18°C) (mg)

Absolute 

Mass 

Difference 

(Pre-Test - 

18°C) (mg)

Relative Mass 

Difference 

(18°C - 25°C) 

(mg)

Absolute Mass 

Difference 

(18°C - 25°C) 

(mg)

Relative Mass 

Difference (PreTest - 25°C) 

(mg)

Absolute Mass 

Difference (PreTest - 25°C) 

(mg)

Relative Mass 

Difference (PreTest - PostTest) (mg)

Absolute 

Mass 

Difference 

(Pre-Test - 

Post-Test) 

(mg)

Mean 0.004(4) 0.005(1) -0.004(8) 0.005(2) -0.000(4) 0.004(1) 0.001(8) 0.003(8)

Min -0.004 0.000 -0.014 0.000 -0.009 0.000 -0.008 0.000

Max 0.041 0.041 0.002 0.014 0.035 0.035 0.039 0.039

Table 2. % Relative Humidity Test Mass Difference Calculations

Sampled Measurement Technology Laboratories (MTL) 46.2-mm Teflon Filters
10

Attachment 1 Table 3

Client:

Balance (D, F, G, or AH): Analyst:

Filter Lot:

100-mg 

Reference 

Standard

S/N 

07122013100J

400-mg 

Reference 

Standard

S/N 

07122013400O Filter ID

First 

Weight 

(mg)

Replicate 

Weight 

(mg)

Difference 

(mg)

Initial Pre-Test 04/24/14 12:57 21.9 36.0 99.998 400.060

10 Pre-Test 04/24/14 21.9 36.0 99.999 400.05920 Pre-Test 04/24/14 21.9 36.0 99.999 400.05930 Pre-Test 04/24/14 21.9 36.0 99.998 400.05840 Pre-Test 04/24/14 17:07 21.9 36.0 99.996 400.057

Initial 18°C 04/25/14 18:25 17.7 35.5 99.997 400.058

10 18°C 04/25/14 17.7 35.5 100.001 400.05920 18°C 04/25/14 17.7 35.5 99.998 400.061

30 18°C 04/25/14 17.7 35.5 99.998 400.06140 18°C 04/25/14 22:10 17.7 35.5 99.997 400.061

Initial 25°C 04/27/14 0:26 25.5 36.4 99.998 400.060

10 25°C 04/27/14 25.5 36.4 100.002 400.06020 25°C 04/27/14 25.5 36.3 100.000 400.06030 25°C 04/27/14 25.5 36.3 99.996 400.05940 25°C 04/27/14 4:12 25.5 36.3 100.001 400.063

Initial Post-Test 04/29/14 14:54 22.0 36.2 99.997 400.061

10 Post-Test 04/29/14 22.0 36.2 99.999 400.06020 Post-Test 04/29/14 22.0 36.2 100.002 400.06330 Post-Test 04/29/14 22.0 36.2 99.997 400.05740 Post-Test 04/29/14 18:30 22.0 36.2 99.998 400.061

See Table 1: Pickup Test for 100% QC 

Duplicates performed during the Pre-Test Weigh 

Session. All Duplicates were within +/- 10 ug.

See Table 1: Pickup Test for 100% QC 

Duplicates performed during the 18 C 

Temperature Test Weigh Session. All Duplicates 

were within +/- 10 ug.

See Table 1: Pickup Test for 100% QC 

Duplicates performed during the 25 C 

Temperature Test Weigh Session. All Duplicates 

were within +/- 11 ug.

See Table 1: Pickup Test for 100% QC 

Duplicates performed during the Post-Test 

Weigh Session. All Duplicates were within +/- 

10 ug.

Date: 5/8/14 -5/12/14 Unknown

Internal QC 

Location Test Name Date

Begin 

Time

End 

Time

AH 

Probe 

Temp 

(°C)

AH 

Probe 

RH %

Internal Quality Control Measures

Table 3. Temperature Test QC Data

RTI Project Number: 0212441.001.022 TDEC

A H PPJ
11

Attachment 1 Table 4

Client:

Balance (D, F, G, or AH): Analyst:

Filter Lot:

100-mg 

Reference 

Standard

S/N 

07122013100J

400-mg 

Reference 

Standard

S/N 

07122013400O Filter ID

First 

Weight 

(mg)

Replicate 

Weight 

(mg)

Difference 

(mg)

Initial Pre-Test 05/08/14 11:14 22.1 35.9 99.995 400.056

10 Pre-Test 05/08/14 22.1 35.9 99.995 400.05720 Pre-Test 05/08/14 22.1 35.9 99.995 400.05630 Pre-Test 05/08/14 22.1 35.9 99.995 400.05740 Pre-Test 05/08/14 17:54 22.1 35.9 99.997 400.057

Initial 25% RH 05/09/14 18:35 22.0 25.8 99.996 400.056

10 25% RH 05/09/14 22.0 25.8 99.996 400.05620 25% RH 05/09/14 22.0 25.7 99.996 400.056

30 25% RH 05/09/14 22.0 25.7 99.995 400.05640 25% RH 05/09/14 23:00 22.0 25.7 99.997 400.057

Initial 45% RH 05/10/14 23:47 21.9 46.6 99.997 400.057

10 45% RH 05/11/14 21.9 46.6 99.995 400.05820 45% RH 05/11/14 21.9 46.6 99.996 400.05730 45% RH 05/11/14 21.9 46.6 99.995 400.05740 45% RH 05/11/14 1:36 21.9 46.6 99.995 400.057

Initial Post-Test 05/12/14 18:52 21.9 36.4 99.995 400.057

10 Post-Test 05/12/14 21.9 36.4 99.996 400.05720 Post-Test 05/12/14 21.9 36.4 99.996 400.05730 Post-Test 05/12/14 21.9 36.4 99.995 400.05740 Post-Test 05/12/14 22:28 21.9 36.4 99.995 400.057

See Table 2: Pickup Test for 100% QC 

Duplicates performed during the Pre-Test Weigh 

Session. All Duplicates were within +/- 10 ug.

See Table 2: Pickup Test for 100% QC 

Duplicates performed during the 25% RH Weigh 

Session. All Duplicates were within +/- 10 ug.

See Table 2: Pickup Test for 100% QC 

Duplicates performed during the 45% RH Weigh 

Session. All Duplicates were within +/- 10 ug.

See Table 2: Pickup Test for 100% QC 

Duplicates performed during the Post-Test 

Weigh Session. All Duplicates were within +/- 

10 ug.

Date: 5/8/14 -5/12/14

End 

Time

AH 

Probe 

Temp 

(°C)

Internal QC 

Location Test Name Date

Begin 

Time

Table 4. % Relative Humidity Test QC Data

RTI Project Number: TDEC

Internal Quality Control Measures

0212441.001.022

A H

Unknown

PPJ

AH 

Probe 

RH %
12

Attachment 2

45.0

40.035.0

30.025.0

20.015.010.0 4/22/14 4/23/14 4/24/14 4/25/14 4/26/14 4/27/14 4/28/14 4/29/14 4/30/14

Date

TemperatureTests - April 23-29, 2014

Weigh Session 1 Weigh Session 4

Weigh Session 2

Weigh Session 3

AH Data Logger TemperatureRoom Data Logger Temperature

AH and Chamber Data Loggers - %Relative Humidity
13

Attachment 3

50.0

45.040.035.0

30.025.0

20.015.0 5/6/14 5/7/14 5/8/14 5/9/14 5/10/14 5/11/14 5/12/14 5/13/14 5/14/14

Date

% Relative HumidityTests - May 7-13, 2014

Weigh Session 1 Weigh Session 4

Weigh Session 2

Weigh Session 3

AH Data Logger %RH

Room Data Logger %RH

AH and Chamber Data Loggers - Temperature