# US 2016/0258157 A1 · Low weight and density fire-resistant gypsum panel

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- Number: US 2016/0258157 A1
- Document ID: US20160258157A1
- Status: Published application
- Kind: A1
- Application number: 15/158,000
- Filed: 2016-05-18
- Published: 2016-09-08
- Earliest claimed: 2005-06-09
- Assignees: United States Gypsum Company
- Applicants: United States Gypsum Company
- Inventors: Qiang YU; Weixin D. SONG; Srinivas VEERAMASUNENI
- Web page: https://patentgrep.com/patent/US20160258157A1

## CPC

- C04B 28/14: containing calcium sulfate cements {(gypsum-paper plates E04C)}
- B32B 13/08: of paper or cardboard
- C04B 20/06: Expanding clay, perlite, vermiculite or like granular materials
- C04B 22/16: containing phosphorus in the anion, e.g. phosphates
- C04B 24/20: Sulfonated aromatic compounds
- C04B 24/383: {Cellulose or derivatives thereof}
- C04B 28/145: {Calcium sulfate hemi-hydrate with a specific crystal form}
- E04C 2/043: {of plaster (E04C2/049 takes precedence)}
- E04C 2/28: combinations of materials fully covered by groups E04C2/04 and E04C2/08
- B32B 2307/3065: Flame resistant or retardant, fire resistant or retardant
- B32B 2307/536: Hardness
- B32B 2307/72: Density
- B32B 2419/00: Buildings or parts thereof
- B32B 2607/00: Walls, panels
- B32B 2607/02: Wall papers, wall coverings
- C04B 2103/408: {Dispersants}
- C04B 2111/0062: {Gypsum-paper board like materials}
- C04B 2111/28: Fire resistance, i.e. materials resistant to accidental fires or high temperatures
- C04B 2111/34: Non-shrinking or non-cracking materials
- C04B 2201/20: for the density
- Y02W 30/91: Use of waste materials as fillers for mortars or concrete
- Y10T 156/1052: with cutting, punching, tearing or severing
- Y10T 428/27: Web or sheet containing structurally defined element or component, the element or component having a specified weight per unit area [e.g., gms/sq cm, lbs/sq ft, etc.]
- Y10T 428/31678: Of metal
- Y10T 428/31982: Wood or paper
- Y10T 428/31989: Of wood
- C04B: LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE {(roofing granules E04D7/005)}; CERAMICS (devitrified glass-ceramics C03C10/00); REFRACTORIES; TREATMENT OF NATURAL STONE
- B32B: LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- E04C: STRUCTURAL ELEMENTS; BUILDING MATERIALS (for bridges E01D; specially designed for insulation or other protection E04B; elements used as building aids E04G; for mining E21; for tunnels E21D; structural elements with broader range of application than for building engineering F16, particularly F16S)
- Y02W: CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
- Y10T: TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION

## Abstract

An about ⅝ inch to ¾ inch thick low weight, low density gypsum panel with fire resistance capabilities sufficient to provide a Thermal Insulation Index of at least 17.0 minutes which when subjected to U419 test procedures will not fail for at least 30 minutes and, in selected embodiments, also has outstanding water resistance properties.

## Claims

### Claim at position 1

1-12. (canceled)

### Claim 13

A gypsum panel with a density of about 27 to about 37 pounds per cubic foot and a Thermal Insulation Index greater than 17.0 minutes comprising:
(a) about 1360-1460 lb/msf set gypsum;
(b) about 1.5-1.8% by weight pregelatinized starch;
(c) about 0.10-0.15% by weight phosphate;
(d) about 0.75-1.0% by weight dispersant;
(e) about 0.1-0.3% by weight mineral, glass or carbon fiber; and
(f) foam voids in an amount effective to provide the specified panel density,
wherein the percentages by weight are based on the weight of the set gypsum and the lb/msf values are for a nominally ⅝ inch thick panel and subject to proportional adjustment for thicker or thinner panels.

### Claim at position 3

14-28. (canceled)