Mold and Moisture Resistant Drywall
Common Product
MasterFormat 09 29 00 Gypsum Board

This information reflects our best understanding of product composition in 2020.

This Common Product (CP) covers mold-resistant drywall intended for interior walls and ceilings in areas that have periodic elevated humidity. Examples include bathrooms, kitchens, laundry rooms, and utility closets. These products are not,...

More about Mold and Moisture Resistant Drywall

This Common Product (CP) covers mold-resistant drywall intended for interior walls and ceilings in areas that have periodic elevated humidity. Examples include bathrooms, kitchens, laundry rooms, and utility closets. These products are not, however, intended for use in areas that are continuously wet such as in saunas or as tile backer for showers or tubs. Mold-resistant drywall typically has a gypsum core sandwiched between recycled paper that has been treated with a biocide. In addition to the treated paper, wax or silicones are added to the gypsum core to make it more moisture-resistant. Some products add a biocide to the core to increase mold resistance as well. Standard mold-resistant drywall panels are 1/2", and most also come in a 5/8" type X option. The latter includes typical additives, like fiberglass and vermiculite, found in type X drywall to increase panel strength and fire resistance. Many mold-resistant drywall specialty products are also available, such as 1/2" Type C panels, and high impact or high abuse panels. Such products likely contain additional additives not identified in this CP, which covers standard 1/2" panels. Some mold-resistant drywall products are wrapped in a fiberglass mat instead of treated paper. These products may be used in exterior applications before the bulding envelope is enclosed and are out of the scope of this CP. This CP addresses drywall made with flue-gas desulphurization (FGD) gypsum. There are not significant differences in the composition of finished drywall products made using different gypsum sources, but natural gypsum is preferred over FGD gypsum because the FGD drywall production process can release mercury into the environment.

Name % Wt Whole Function GS Score Sources
Flue Gas Desulfurization (FGD) gypsum
90.40% Structure Component NoGS
Cellulose, microcrystalline
9004-34-6
4.47% Cellulose Fiber LT-UNK
Water
7732-18-5
2.51% Moisture BM-4
Starch
9005-25-8
0.50% Binder LT-UNK
Sodium o-phenylphenate
132-27-4
0.38% Biocide LT-1
Poly(methylhydrosiloxane)
63148-57-2
0.30% Water Resistance NoGS
Limestone
1317-65-3
0.28% Filler LT-UNK
2,5-Furandione, dihydro-, mono-C15-20-alkenyl derivs.
68784-12-3
0.24% Sizing Agent LT-UNK
Quartz
14808-60-7
0.23% Impurity LT-1
Kaolin, calcined
92704-41-1
0.20% Filler LT-UNK
Dextrin
9004-53-9
0.13% Humectant LT-UNK
Sodium polynaphthalenesulfonate
9084-06-4
0.10% Dispersant LT-P1
Boric acid
10043-35-3
0.09% Strengthener LT-1
Poly(oxy-1,2-ethanediyl), alpha-sulfo-omega-hydroxy-, C8-10-alkyl ethers, ammonium salts
68891-29-2
0.04% Foaming Agent LT-UNK
2-Pyridinethiol, 1-oxide, sodium salt
3811-73-2
0.03% Biocide LT-P1
Starch
9005-25-8
0.02% Binder LT-UNK
Potassium
7440-09-7
0.02% Impurity LT-P1
Sodium
7440-23-5
0.02% Impurity LT-P1
Bentonite
1302-78-9
0.01% Retention Agent LT-UNK
Sodium sulfate anhydrous
7757-82-6
0.01% Accelerator LT-UNK
Protein hydrolysate
9015-54-7
0.01% Retarder NoGS
Ethylenevinylacetate copolymer
24937-78-8
0.01% Adhesive LT-UNK
Manganese
7439-96-5
<0.01% Impurity LT-P1
Zinc, elemental
7440-66-6
<0.01% Impurity LT-P1
Nickel
7440-02-0
<0.01% Impurity LT-1
Chromium
7440-47-3
<0.01% Impurity LT-P1
Vanadium, elemental
7440-62-2
<0.01% Impurity LT-1
T Lead
7439-92-1
<0.01% Impurity BM-1
Selenium, elemental
7782-49-2
<0.01% Impurity LT-P1
T Arsenic
7440-38-2
<0.01% Impurity LT-1
Cobalt
7440-48-4
<0.01% Impurity LT-1
Zirconium
7440-67-7
<0.01% Impurity LT-UNK
Uranium
7440-61-1
<0.01% Impurity LT-1
T MERCURY
7439-97-6
<0.01% Impurity LT-1
Thorium
7440-29-1
<0.01% Impurity LT-1
T CADMIUM
7440-43-9
<0.01% Impurity LT-1
Beryllium, elemental
7440-41-7
<0.01% Impurity LT-1
Antimony, elemental
7440-36-0
<0.01% Impurity LT-1
Name % Wt Part % Wt Whole Function GS Score Sources
Mold-resistant FGD Drywall Core
94.74% 94.74% Structure Component BM-1  
Flue Gas Desulfurization (FGD) gypsum
95.42% 90.40% Structure Component NoGS
Water
7732-18-5
2.65% 2.51% Moisture BM-4
Starch
9005-25-8
0.53% 0.50% Binder LT-UNK
Sodium o-phenylphenate
132-27-4
0.40% 0.38% Biocide LT-1
Poly(methylhydrosiloxane)
63148-57-2
0.32% 0.30% Water Resistance NoGS
Residuals in Processed Drywall Gypsum (FGD)
0.29% 0.27% Residuals BM-1
Quartz
14808-60-7
84.64% 0.23% Impurity LT-1
Potassium
7440-09-7
7.77% 0.02% Impurity LT-P1
Sodium
7440-23-5
5.74% 0.02% Impurity LT-P1
Manganese
7439-96-5
1.10% <0.01% Impurity LT-P1
Zinc, elemental
7440-66-6
0.32% <0.01% Impurity LT-P1
Nickel
7440-02-0
0.11% <0.01% Impurity LT-1
Chromium
7440-47-3
0.07% <0.01% Impurity LT-P1
T Lead
7439-92-1
0.06% <0.01% Impurity BM-1
Vanadium, elemental
7440-62-2
0.06% <0.01% Impurity LT-1
Selenium, elemental
7782-49-2
0.04% <0.01% Impurity LT-P1
T Arsenic
7440-38-2
0.03% <0.01% Impurity LT-1
Cobalt
7440-48-4
0.02% <0.01% Impurity LT-1
T MERCURY
7439-97-6
0.01% <0.01% Impurity LT-1
Thorium
7440-29-1
0.01% <0.01% Impurity LT-1
Uranium
7440-61-1
0.01% <0.01% Impurity LT-1
Zirconium
7440-67-7
0.01% <0.01% Impurity LT-UNK
Antimony, elemental
7440-36-0
<0.01% <0.01% Impurity LT-1
Beryllium, elemental
7440-41-7
<0.01% <0.01% Impurity LT-1
T CADMIUM
7440-43-9
<0.01% <0.01% Impurity LT-1
Dextrin
9004-53-9
0.13% 0.13% Humectant LT-UNK
Sodium polynaphthalenesulfonate
9084-06-4
0.11% 0.10% Dispersant LT-P1
Boric acid
10043-35-3
0.10% 0.09% Strengthener LT-1
Poly(oxy-1,2-ethanediyl), alpha-sulfo-omega-hydroxy-, C8-10-alkyl ethers, ammonium salts
68891-29-2
0.04% 0.04% Foaming Agent LT-UNK
Protein hydrolysate
9015-54-7
0.01% 0.01% Retarder NoGS
Sodium sulfate anhydrous
7757-82-6
0.01% 0.01% Accelerator LT-UNK
Mold-resistant Drywall Paper Facing
5.25% 5.25% Structure Component LT-P1  
Cellulose, microcrystalline
9004-34-6
85.07% 4.47% Cellulose Fiber LT-UNK
Limestone
1317-65-3
5.27% 0.28% Filler LT-UNK
2,5-Furandione, dihydro-, mono-C15-20-alkenyl derivs.
68784-12-3
4.62% 0.24% Sizing Agent LT-UNK
Kaolin, calcined
92704-41-1
3.79% 0.20% Filler LT-UNK
2-Pyridinethiol, 1-oxide, sodium salt
3811-73-2
0.55% 0.03% Biocide LT-P1
Starch
9005-25-8
0.42% 0.02% Binder LT-UNK
Bentonite
1302-78-9
0.28% 0.01% Retention Agent LT-UNK
Ethylenevinylacetate copolymer
24937-78-8
0.01% 0.01% Adhesive LT-UNK

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Known or Potential Residuals
Known or Potential Residuals for Chemical
CASRN NAME GS SCORE TYPE FREQUENCY % WT CHEM % WT PRODUCT SOURCE
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Other Process Chemicals
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Sources
Sources for Common Product Data
Source Uploaded Document Linked Document
American Gypsum MSDS
Borax (gypsum)
ClassicRoc SDS
Continental SDS
Diloflo CA-30 SDS
Dow Preservatives
Dow US8362051B2
DuPont US6800361B2
Dupont Wallboard Biocides
EPA DCOIT
EPA Dowicide A
EPA Fungiblock CT 1000
EPA2009
EPRI2010
Fly Ash Catalysts
FPInnovations US10011528B2
GA EPD - Glass Mat
GA-235-2019
Georgia-Pacific US10427979B2
Gold Bond SDS
Gold Bond XP HPD
Gold Bond XP PDS
Gold Bond XP SDS
Guard Rey HPD
Guard Rey TDS
Gypsum Additives
Gypsum Wallboard Closed-loop Recycling
Hercules US8404365B2
Hyonic PFM-33 TDS
Keltrol
Knauf ES2655415T3
M-Bloc HPD
M-Bloc PDS
M2Tech HPD
M2Tech PDS
M2Tech SDS
M30 TDS
Mold curb Plus PDS
Mold Curb Type X HPD
Mold Defense PDS
Mold Tough Firecode X HPD
Mold Tough Firecode X PDS
Natrasol 250 TDS
PABCO Gypsum SDS
Panel Rey HPD
Papcel
Quickrete SDS
ToughRock Mold-Guard PDS
ToughRock SDS
ToughRock SDS
Type X EPD
USG
USG US10421250
USG US20150030862A1
USG US20170246838A1
USG US20180010301A1
USG US4372814A
USG US8617718B2
Yost