Fire-resistant piping material

Patent metadata

Field	Value
Publication number	US-8962115-B2
Application number	US-73335910-A
Country	US
Kind code	B2
Filing date	Aug 29, 2007
Priority date	Aug 29, 2007
Publication date	Feb 24, 2015
Grant date	Feb 24, 2015

Abstract

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.

First claim

The invention claimed is:

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.

Assignees

• Okabe Masashi
• Ichihara Koji
• Kimura Hideharu
• Sanni Toshifumi
• Sekisui Chemical Co Ltd

Inventors

• Okabe Masashi
• Ichihara Koji
• Kimura Hideharu
• Sanni Toshifumi

Classifications

• B32B27/18

  characterised by the use of special additives · CPC title

• F16L59/145

  providing fire-resistance · CPC title

• C08K3/04 Primary

  Carbon · CPC title

• C08L27/06 Primary

  Homopolymers or copolymers of vinyl chloride · CPC title

• B32B1/08

  Tubular products · CPC title