Fire protective intumescent mastic composition and method employing same
AssigneePPG Industries, Inc.
InventorsThomas A. Ward, Stanley T. Greer, William G. Boberski, Jerome A. Seiner
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Abstract
An intumescent curable composition has as its principal constituents an epoxy resin; a curing agent; and an additive component which is composed of a mixture of materials which provide a source of phosphorus, zinc, boron and an expansion gas. The aforesaid composition is capable of forming a carbonaceous char upon exposure to heat or flame.
Claims44
A process for protecting a substrate from fire and excessive heat comprising:
- I. applying to the surface of a substrate a coating of a char-forming intumescent curable composition comprising:
- (a) an epoxy resin;
- (b) a curing agent adapted to cure said epoxy resin;
- and
- (c) an additive component, comprising a mixture of materials adapted to provide a source of
- (a) phosphorus,
- (b) zinc,
- (c) boron, and
- (d) an expansion gas upon thermal decomposition;
- said composition being capable of forming a carbonaceous char upon exposure to heat or flame;
- II. overlaying the intumescent composition with a mesh member;
- and
- III. allowing the intumescent composition to cure.
A method of reducing the rate of temperature rise in a substrate when it is subjected to fire conditions, which comprises applying to the surface of the substrate a curable composition which when exposed to fire conditions intumesces, characterized in that said composition comprises:
- (a) an epoxy resin;
- (b) a curing agent adapted to cure said epoxy resin;
- and
- (c) an additive component, comprising a mixture of materials adapted to provide a source of
- (i) phosphorus,
- (ii) zinc,
- (iii) boron, and
- (iv) an expansion gas upon thermal decomposition;
- said composition being adapted to provide a carbonaceous char when exposed to fire conditions retaining its integral structure and adhering to the substrate without external reinforcement, with the proviso that when applied onto a 10W29 steel beam at a thickness of about 0.60 inches and subjected to Underwriter's Laboratories test, UL-263, the char that is formed is capable of maintaining the steel at a temperature below 1000.degree. F. for a period of at least about 2 hours.
An intumescent, curable composition, comprising
- (a) an epoxy resin;
- (b) a curing agent adapted to cure said epoxy resin;
- and
- (c) an additive component, comprising a mixture of materials adapted to provide a source of
- (a) phosphorus;
- (b) zinc;
- (c) boron;
- and
- (d) expansion gas upon thermal decomposition;
- said composition being capable of forming a carbonaceous char upon exposure to heat or flame.
A substrate which demonstrates a reduced rate of temperature rise when it is subjected to fire conditions, characterized by having applied on the substrate surface a curable composition which when exposed to fire conditions intumesces, said composition, comprising:
- (a) an epoxy resin;
- (b) a curing agent adapted to cure said epoxy resin;
- and
- (c) an additive component, comprising a mixture of materials adapted to provide a source of
- (i) phosphorus,
- (ii) zinc,
- (iii) boron, and
- (iv) an expansion gas upon thermal decomposition;
- said composition being adapted to provide a carbonaceous char when exposed to fire conditions retaining its integral structure and adhering to the substrate without external reinforcement, with the proviso that when applied onto a 10W49 steel beam at a thickness of about 0.60 inches and subjected to Underwriter's Laboratories test, UL-263, the char that is formed is capable of maintaining the steel at a temperature below 1000.degree. F. for a period of at least about 2 hours.
Dependencies are inferred from the claim text.