Fire-resistant piping material
It is an object to provide a fire-resistant piping material that can be fire-protection measures by itself and is excellent in construction workability. A single-layered fire-resistant piping material according to the present invention is constituted of a fire-resistant resin composition containing heat-expandable graphite in an amount of 1 to 10 parts by weight based on 100 parts by weight of a polyvinyl chloride-based resin. A multilayered fire-resistant piping material according to the present invention includes a tubular fire-resistant expandable layer made of a heat-expandable fire-resistant resin composition and a covering layer covering at least one of the outer surface and the inner surface of the fire-resistant expandable layer, and the fire-resistant expandable layer is formed of a fire-resistant resin composition containing heat-expandable graphite in an amount of 1 to 15 parts by weight based on 100 parts by weight of a polyvinyl chloride-based resin, and the covering layer is formed of a polyvinyl chloride-based resin composition not containing heat-expandable fire-resistant materials.
1. A fire-resistant pipe, comprising
a pipe wall having a hollow tubular interior space for conveying a fluid therethrough,
wherein the pipe wall consists of a triple layer construction,
wherein the pipe wall comprises
a tubular fire-resistant expandable layer made of a heat-expandable fire-resistant polyvinyl chloride-based resin composition,
a covering layer covering the outer surface of the fire-resistant expandable layer, and
a covering layer covering the inner surface of the fire-resistant expandable layer,
wherein the fire-resistant expandable layer comprises
a fire-resistant polyvinyl chloride-based resin composition containing a heat-expandable graphite having
an expansion volume in the range of 100 to 250 mL/g and a 1.3-time expansion temperature of 180 to 240° C. in an amount of 1 to 15 parts by weight based on 100 parts by weight of the polyvinyl chloride-based resin; and
wherein the covering layers comprise
a polyvinyl chloride-based resin composition not containing heat-expandable fire-resistant materials, and
wherein the pipe wall has a tensile strength of 30 MPa or greater,
wherein,
when the pipe is subjected to a fire-resistant test complying with ISO 834-1,
wherein the pipe is passed through a flooring material,
wherein the underside of the flooring material is heated,
wherein one end of the pipe is exposed to a heated side by 300 mm from the surface on the heated side of the flooring material, and
wherein the other end of the pipe is exposed to a non-heated side by 800 mm from the surface on the non-heated side of the flooring material,
the inner cross-sectional area S1 at the end of the pipe on the heated side and the inner cross-sectional area S2 at a minimum inner diameter of the pipe after burning satisfy the relationship:
( S 2 /S 1)×100≦50.