Type X Drywall
Common Product
MasterFormat 09 29 00 Gypsum Board

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

Drywall is composed of gypsum plaster pressed between a paper lining. The key material is gypsum (calcium sulfate), which is available in different hydration levels, and in anhydrous form. Natural gypsum stone is calcium sulfate-dihydrate (CaSO4*...

More about Type X Drywall

Drywall is composed of gypsum plaster pressed between a paper lining. The key material is gypsum (calcium sulfate), which is available in different hydration levels, and in anhydrous form. Natural gypsum stone is calcium sulfate-dihydrate (CaSO4*2H2O). The anhydrous calcium sulfate can be found in nature as anhydrite (CaSO4). Gypsum also occurs in large quantities as the industry by-product, otherwise known as flue-gas desulphurized (FGD) gypsum. There are not significant differences in the composition of finished drywall products made using these different source materials, but natural gypsum is preferred over FGD gypsum because the FGD drywall production process can release mercury into the environment. In 2018, production of synthetic gypsum surpassed production of natural gypsum in the U.S. The amount of FGD and natural gypsum used in drywall varies regionally. Products tend to be composed primarily of one type or the other. Boards can also contain around 1-10% recycled scraps from the drywall manufacturing process and drywall installation or demolition. This common product profile characterizes a type X drywall product made with FGD gypsum. Type X drywall is fire rated drywall that is more fire resistant than standard drywall. It is specified in many building codes for use in a variety of commercial and residential applications. Examples include interior and exterior walls near furnaces and utility rooms, and in the walls and ceilings of attached garages adjacent to the main living area. It has greater thickness and special core additives (mainly vermiculite and fiberglass) which provide additional fire resistance, higher rigidity, and enhanced sound attenuation as compared to regular 1/2” gypsum board. 5/8” (16mm) type X North American gypsum boards are manufactured to ASTM C1396, Standard Specification for Gypsum Board.

A historical version of this Common Product can be found here: https://pharosproject.net/common-products/2204418

Name % Wt Whole Function GS Score Sources
Flue Gas Desulfurization (FGD) gypsum
88.50% Structure Component NoGS
Cellulose, microcrystalline
9004-34-6
3.67% Cellulose Fiber LT-UNK
Water
7732-18-5
3.30% Moisture BM-4
Starch
9005-25-8
0.96% Binder LT-UNK
VERMICULITE
1318-00-9
0.96% Fire Resistance NoGS
Potassium sulfate
7778-80-5
0.48% Accelerator LT-UNK
Fiberglass
65997-17-3
0.36% Core Strength, Fire Resistance LT-UNK
Boric acid
10043-35-3
0.29% Strengthener LT-1
Protein hydrolysate
9015-54-7
0.24% Retarder NoGS
Quartz
14808-60-7
0.22% Impurity LT-1
Starch
9005-25-8
0.20% Binder, Sizing Agent LT-UNK
Dextrin
9004-53-9
0.19% Humectant LT-UNK
Limestone
1317-65-3
0.19% Filler, Retention Agent LT-UNK
Kaolin, calcined
92704-41-1
0.14% Filler LT-UNK
Metaphosphoric acid (H3P3O9), trisodium salt
7785-84-4
0.11% Core Strength LT-UNK
Sodium polynaphthalenesulfonate
9084-06-4
0.07% Dispersant LT-P1
Poly(oxy-1,2-ethanediyl), alpha-sulfo-omega-hydroxy-, C8-10-alkyl ethers, ammonium salts
68891-29-2
0.06% Foaming Agent LT-UNK
Potassium
7440-09-7
0.02% Impurity LT-P1
Acetic acid ethenyl ester, polymer with ethenol
25213-24-5
0.02% Adhesive LT-UNK
Sodium
7440-23-5
0.01% Impurity LT-P1
Bentonite
1302-78-9
0.01% Filler, Retention Agent 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
Type X Drywall Core
95.77% 95.77% Structure Component BM-1  
Flue Gas Desulfurization (FGD) gypsum
92.41% 88.50% Structure Component NoGS
Water
7732-18-5
3.45% 3.30% Moisture BM-4
Starch
9005-25-8
1.00% 0.96% Binder LT-UNK
VERMICULITE
1318-00-9
1.00% 0.96% Fire Resistance NoGS
Potassium sulfate
7778-80-5
0.50% 0.48% Accelerator LT-UNK
Fiberglass
65997-17-3
0.38% 0.36% Core Strength, Fire Resistance LT-UNK
Boric acid
10043-35-3
0.30% 0.29% Strengthener LT-1
Residuals in Processed Drywall Gypsum (FGD)
0.27% 0.26% Residuals BM-1
Quartz
14808-60-7
84.64% 0.22% Impurity LT-1
Potassium
7440-09-7
7.77% 0.02% Impurity LT-P1
Sodium
7440-23-5
5.74% 0.01% 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
Protein hydrolysate
9015-54-7
0.25% 0.24% Retarder NoGS
Dextrin
9004-53-9
0.20% 0.19% Humectant LT-UNK
Metaphosphoric acid (H3P3O9), trisodium salt
7785-84-4
0.11% 0.11% Core Strength LT-UNK
Sodium polynaphthalenesulfonate
9084-06-4
0.07% 0.07% Dispersant LT-P1
Poly(oxy-1,2-ethanediyl), alpha-sulfo-omega-hydroxy-, C8-10-alkyl ethers, ammonium salts
68891-29-2
0.06% 0.06% Foaming Agent LT-UNK
Drywall Paper Facing
4.21% 4.21% Structure Component LT-UNK  
Cellulose, microcrystalline
9004-34-6
87.16% 3.67% Cellulose Fiber LT-UNK
Starch
9005-25-8
4.75% 0.20% Binder, Sizing Agent LT-UNK
Limestone
1317-65-3
4.52% 0.19% Filler, Retention Agent LT-UNK
Kaolin, calcined
92704-41-1
3.25% 0.14% Filler LT-UNK
Bentonite
1302-78-9
0.32% 0.01% Filler, Retention Agent LT-UNK
Acetic acid ethenyl ester, polymer with ethenol
25213-24-5
0.02% 0.02% 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
CASRN NAME GS Score TYPE FREQUENCY % WT CHEM % WT PRODUCT SOURCES
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HBN Resources (2)
HBN Resources for Product
TYPE TITLE
Report Post-Consumer Cullet In California
Report Optimizing Recycling: Criteria for Comparing and Improving Recycled Feedstocks in Building Products
Sources
Sources for Common Product Data
Source Uploaded Document Linked Document
Alpha Foamer SDS
Alpha Foamer TDS
Athena 2011
Borax (gypsum)
CertainTeed HPD
Certainteed Type X
ClassicRoc HPD
ClassicRoc SDS
Continental SDS
EcoSmart HPD
EPA2009
EPRI2010
Fire Rated Gypsum
Fire Rey X HPD
Fire Rey X TDS
FireBloc SDS
FireBloc Type X
FireBloc Type X HPD
Firecheck Type X Submittal
Firecode X HPD
Firecode X Submittal
Flame Curb Submittal
Flame Curb Type X HPD
FPInnovations US10011528B2
GA Type X EPD
Georgia Pacific US3616173A
Gold Bond SDS
Gold-bond Fireshield HPD
Gold-bond Fireshield TDS
Gypsum Additives
Gypsum Wallboard Closed-loop Recycling
History of Paper
PABCO Gypsum SDS
Panel Rey HPD
Papcel
Saint Gobain Type X HPD
Sheetrock SDS
Sizing Agents
ToughRock Fireguard X SDS
ToughRock Fireguard X TDS
ToughRock SDS
ToughRock SDS
USG
USG US20180340297A1
USG US4372814A
Vermiculite - Gypsum
Yost