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. 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 Subscribe to view
Cellulose, microcrystalline
9004-34-6
3.67% Cellulose Fiber Subscribe to view
Water
7732-18-5
3.30% Moisture Subscribe to view
Starch
9005-25-8
0.96% Binder Subscribe to view
VERMICULITE
1318-00-9
0.96% Fire Resistance Subscribe to view
Potassium sulfate
7778-80-5
0.48% Accelerator Subscribe to view
Fiberglass
65997-17-3
0.36% Core Strength, Fire Resistance Subscribe to view
Boric acid
10043-35-3
0.29% Strengthener Subscribe to view
Protein hydrolysate
9015-54-7
0.24% Retarder Subscribe to view
Quartz
14808-60-7
0.22% Impurity Subscribe to view
Starch
9005-25-8
0.20% Binder, Sizing Agent Subscribe to view
Dextrin
9004-53-9
0.19% Humectant Subscribe to view
Limestone
1317-65-3
0.19% Filler, Retention Agent Subscribe to view
Kaolin, calcined
92704-41-1
0.14% Filler Subscribe to view
Metaphosphoric acid (H3P3O9), trisodium salt
7785-84-4
0.11% Core Strength Subscribe to view
Sodium polynaphthalenesulfonate
9084-06-4
0.07% Dispersant Subscribe to view
Poly(oxy-1,2-ethanediyl), alpha-sulfo-omega-hydroxy-, C8-10-alkyl ethers, ammonium salts
68891-29-2
0.06% Foaming Agent Subscribe to view
Potassium
7440-09-7
0.02% Impurity Subscribe to view
Acetic acid ethenyl ester, polymer with ethenol
25213-24-5
0.02% Adhesive Subscribe to view
Sodium
7440-23-5
0.01% Impurity Subscribe to view
Bentonite
1302-78-9
0.01% Filler, Retention Agent Subscribe to view
Manganese
7439-96-5
<0.01% Impurity Subscribe to view
Zinc, elemental
7440-66-6
<0.01% Impurity Subscribe to view
Nickel
7440-02-0
<0.01% Impurity Subscribe to view
Chromium
7440-47-3
<0.01% Impurity Subscribe to view
Vanadium, elemental
7440-62-2
<0.01% Impurity Subscribe to view
T Lead
7439-92-1
<0.01% Impurity Subscribe to view
Selenium, elemental
7782-49-2
<0.01% Impurity Subscribe to view
T Arsenic
7440-38-2
<0.01% Impurity Subscribe to view
Cobalt
7440-48-4
<0.01% Impurity Subscribe to view
Zirconium
7440-67-7
<0.01% Impurity Subscribe to view
Uranium
7440-61-1
<0.01% Impurity Subscribe to view
T MERCURY
7439-97-6
<0.01% Impurity Subscribe to view
Thorium
7440-29-1
<0.01% Impurity Subscribe to view
T CADMIUM
7440-43-9
<0.01% Impurity Subscribe to view
Beryllium, elemental
7440-41-7
<0.01% Impurity Subscribe to view
Antimony, elemental
7440-36-0
<0.01% Impurity Subscribe to view
Name % Wt Part % Wt Whole Function GS Score Sources
Type X Drywall Core
95.77% 95.77% Structure Component Subscribe to view  
Flue Gas Desulfurization (FGD) gypsum
92.41% 88.50% Structure Component Subscribe to view
Water
7732-18-5
3.45% 3.30% Moisture Subscribe to view
Starch
9005-25-8
1.00% 0.96% Binder Subscribe to view
VERMICULITE
1318-00-9
1.00% 0.96% Fire Resistance Subscribe to view
Potassium sulfate
7778-80-5
0.50% 0.48% Accelerator Subscribe to view
Fiberglass
65997-17-3
0.38% 0.36% Core Strength, Fire Resistance Subscribe to view
Boric acid
10043-35-3
0.30% 0.29% Strengthener Subscribe to view
Residuals in Processed Drywall Gypsum (FGD)
0.27% 0.26% Residuals Subscribe to view
Quartz
14808-60-7
84.64% 0.22% Impurity Subscribe to view
Potassium
7440-09-7
7.77% 0.02% Impurity Subscribe to view
Sodium
7440-23-5
5.74% 0.01% Impurity Subscribe to view
Manganese
7439-96-5
1.10% <0.01% Impurity Subscribe to view
Zinc, elemental
7440-66-6
0.32% <0.01% Impurity Subscribe to view
Nickel
7440-02-0
0.11% <0.01% Impurity Subscribe to view
Chromium
7440-47-3
0.07% <0.01% Impurity Subscribe to view
T Lead
7439-92-1
0.06% <0.01% Impurity Subscribe to view
Vanadium, elemental
7440-62-2
0.06% <0.01% Impurity Subscribe to view
Selenium, elemental
7782-49-2
0.04% <0.01% Impurity Subscribe to view
T Arsenic
7440-38-2
0.03% <0.01% Impurity Subscribe to view
Cobalt
7440-48-4
0.02% <0.01% Impurity Subscribe to view
T MERCURY
7439-97-6
0.01% <0.01% Impurity Subscribe to view
Thorium
7440-29-1
0.01% <0.01% Impurity Subscribe to view
Uranium
7440-61-1
0.01% <0.01% Impurity Subscribe to view
Zirconium
7440-67-7
0.01% <0.01% Impurity Subscribe to view
Antimony, elemental
7440-36-0
<0.01% <0.01% Impurity Subscribe to view
Beryllium, elemental
7440-41-7
<0.01% <0.01% Impurity Subscribe to view
T CADMIUM
7440-43-9
<0.01% <0.01% Impurity Subscribe to view
Protein hydrolysate
9015-54-7
0.25% 0.24% Retarder Subscribe to view
Dextrin
9004-53-9
0.20% 0.19% Humectant Subscribe to view
Metaphosphoric acid (H3P3O9), trisodium salt
7785-84-4
0.11% 0.11% Core Strength Subscribe to view
Sodium polynaphthalenesulfonate
9084-06-4
0.07% 0.07% Dispersant Subscribe to view
Poly(oxy-1,2-ethanediyl), alpha-sulfo-omega-hydroxy-, C8-10-alkyl ethers, ammonium salts
68891-29-2
0.06% 0.06% Foaming Agent Subscribe to view
Drywall Paper Facing
4.21% 4.21% Structure Component Subscribe to view  
Cellulose, microcrystalline
9004-34-6
87.16% 3.67% Cellulose Fiber Subscribe to view
Starch
9005-25-8
4.75% 0.20% Binder, Sizing Agent Subscribe to view
Limestone
1317-65-3
4.52% 0.19% Filler, Retention Agent Subscribe to view
Kaolin, calcined
92704-41-1
3.25% 0.14% Filler Subscribe to view
Bentonite
1302-78-9
0.32% 0.01% Filler, Retention Agent Subscribe to view
Acetic acid ethenyl ester, polymer with ethenol
25213-24-5
0.02% 0.02% Adhesive Subscribe to view

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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