A novel method of improving the water and leaching resistances and durability of a fire retardant-treated wood product by using a chemical fire retardant composition in which crosslinking polyvinyl acetate (XPAVc or X-PVAc) is applied as a protective coating on wood over the fire retardant layer. An additional crosslinking polyvinyl acetate coating layer or one or more layers of acrylic, alkyd, epoxy, lacquer, polyester, polyurethane, silicone coatings, vinyl ester, or the like may further cover the cured crosslinking polyvinyl acetate primer and then dried or cured.

A multimodal coating and method of coating a substrate are disclosed. The coating includes a structural framework: and a medium embedded in the structural framework forming an intumescent coating, the intumescent coating configured to undergo intumescent expansion of an outermost coating of the medium upon heating.

An intumescent mesh has a flexible grid with a plurality of strands that form a series of openings in the flexible grid, and an intumescent coating applied to the flexible grid. The intumescent coating is made of an expandable graphite and a polymer-based carrier as ingredients and having an activation temperature above which the intumescent coating swells. The grid is sized such that the intumescent coating permits airflow through the flexible grid until the intumescent coating is exposed to temperatures at or above the activation temperature, whereupon the intumescent coating swells to seal the openings and prevent air flow through the flexible grid.

A reinforcing fabric configured for intumescent material expansion includes a woven fabric. The woven fabric has a plurality of composite yarns. Each composite yarn includes a fire resistant component and a crimping component. The crimping component is bonded to the fire resistant component, where the fire resistant component is in a crimped state and the crimping component is in a relaxed state when bonded. The woven fabric is woven with the plurality of the composite yarns with the fire resistant component maintained in the crimped state and the crimping component maintained in the relaxed state in each of the composite yarns. When the woven fabric is imbedded in an intumescent material, the woven fabric is configured to reinforce the intumescent material during heat expansion, and mechanical loads from the expanding intumescent material, in a controlled and predictable manner.

The invention as disclosed herein includes a composition for increasing the fire resistance of a substrate. The composition is composed of a solvent; a polymer binder; a carbon-based flame retardant; a fire retardant compound, such as a phosphorous based flame retardant compound or a char forming flame retardant; a heat absorbing compound; and a phyllosilicate material. Also included are methods of reducing the flammability of a substrate or of increasing the fire resistance of a substrate by applying the composition of the invention, wherein the inflammability of the substrate is improved when compared to an identical substrate that is not coated with the composition. Fire resistant coatings prepared from the composition of the invention are disclosed. The assemblies described herein exhibit improved fire resistance as compared to an identical assembly that does not include the coating.

A scrim is described comprising a plurality of fibers and a coating disposed on the scrim wherein the coating comprises a binder and a flame retardant additive. The scrim has a basis weight less than or equal to 200 grams/m.sup.2 and passes the UL94-V0 flammability standard. The scrim may be incorporated into other articles and methods. Also described is a flame retardant coating composition.

The present invention is directed to compounds that generate nitrogen gas and enhance char formation upon combustion and to intumescent coating compositions containing them. The compounds of the present invention typically comprise a reaction product of: (i) a nitrogen-containing compound; and (ii) a siloxane-containing compound. The nitrogen-containing compound (i) and the siloxane-containing compound (ii) are covalently bonded directly to each other.

A novel method of improving the water and leaching resistances and durability of a fire retardant-treated wood product by using a chemical fire retardant composition in which crosslinking polyvinyl acetate (XPAVc or X-PVAc) is applied as a protective coating on wood over the fire retardant layer. An additional crosslinking polyvinyl acetate coating layer or one or more layers of acrylic, alkyd, epoxy, lacquer, polyester, polyurethane, silicone coatings, vinyl ester, or the like may further cover the cured crosslinking polyvinyl acetate primer and then dried or cured.

An intumescent composition capable of withstanding temperature cycling as low as 60 C. without cracking is contemplated. The composition also exhibits enhanced durability due to its resistance to water absorption, its acceptable cure times, and (when exposed to fire conditions) its well-adhered, foamed char layer.

A composition for an intumescent coating contains a binder system and an intumescent composition. The binder system contains an alkoxy-functional organic polymer, which contains an alkoxy-functional silane group; and a styrene-acrylate copolymer. The composition is useful as a coating, in particular a fire-protection coating.