High temperature heat transfer barrier and vapor barrier and methods
AssigneeW. R. Grace & Co.-Conn.
InventorsLarry S. Shu, Paul Cirignano
Life of this patent
Estimating the term…
Abstract
The use of a relatively tin vermiculite coating layer, preferably spray-applied as an aqueous dispersion of delaminated vermiculite platelets, over a (primary) spray-applied hydratable cementitious fireproofing coating, has been found surprisingly to provide fireproofing protection that equals or exceeds that provided by fireproofing used alone. Accordingly, the time, effort, and costs normally incurred by the need to achieve thick coating layers in conventional fireproofing are considerably decreased.
Claims15
A coating system for providing fireproofing protection to a substrate, comprising:
- an hydratable cementitious fireproofing composition providing as a powder in a container, said composition operative upon the addition of water to be spray-applied as a coating onto a substrate comprised of metal, wood, metal, composite material, glass, or mixture thereof, said fireproofing composition comprising;
- a cementitious binder in the amount of at least 30% by weight of said fireproofing composition, said binder comprising gypsum Plaster of Paris, Portland cement, aluminous, cement, pozzoalanic cement, or mixture thereof;
- and said fireproofing composition further comprising at least one light-weight aggregate in the amount of 1-5% by weight selected from the group consisting of expanded vermiculite, perlite, shredded polystyrene, or mixture thereof;
- an accelerator provided in a container, said accelerator operative to be injected during spray-application of said fireproofing composition at an application site;
- and
- an aqueous dispersion provided in a container, of delaminated vermiculite platelets operative to provide an overlying coating over said hydratable cementitious fireproofing composition when said fireproofing composition is spray-applied on to a substrate surface.
Method for protecting a steel beam or panel, comprising:
- (A) spray-applying onto a steel beam or panel, using an injected accelerator, a hydratable cementitious fireproofing composition, said fireproofing composition comprising a cementitious binder in the amount of at least 30% by weight of said fireproofing composition, said binder comprising gypsum, Plaster of Paris, Portland cement, aluminous cement, pozzolanic cement, or mixture thereof;
- and said fireproofing composition further composition at least one light-weight aggregate in the amount of 1-5% by weight, said light-weight aggregate selected from the group consisting of expanded vermiculite perlite, shredded polystyrene, or mixture thereof, said fireproofing coating being spray-applied at a coverage rate of 0.2-1.2 board feet per pound based on the dry weight of the fireproofing composition;
- and (B) spray-applying onto said spray-applied coating of fireproofing composition at a coverage rate of 50-200 square feet per gallon a secondary coating comprising an aqueous dispersion of delaminated vermiculite platelets.
Dependencies are inferred from the claim text.