Gypsum board/intumescent material ceiling boards
US6270915A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Jun 4, 1999 |
| Grant date | Aug 7, 2001 |
| Priority date | — |
| Expiry date | Jun 4, 2019 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10T428/232
- WIPO fieldCivil engineering
- WIPO sectorOther fields
Abstract
A gypsum board/intumescent material ceiling board includes a gypsum board and a fire-resistive barrier. A first major surface of the gypsum board is an upper side for abutting framing and a second major surface of the gypsum board is an underside for facing a room interior. The fire-resistive barrier is a layer of intumescent coating material applied to and coextensive with one of the major surfaces of the gypsum board. The intumescent coating material contains expandable graphite and a corrosion inhibitor in sufficient quantities to provide a corrosion inhibiting layer on metal surfaces, such as the surfaces of metal fasteners, with which the intumescent coating material comes in contact. In addition, the intumescent coating material has a pH greater than 7.0 to reduce corrosive properties of the intumescent material and provide a chemical environment conducive to the forming of the corrosion inhibiting layer by the corrosion inhibitor.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.