Fire-retarding laminated element and a method of controlling expansion of expandable, fire-retarding foaming-agent layers

US4762746A · kind A · utility

Assignee

• Odenwald-Chemie GmbH · DE

Inventors

• Ludwig Wesch · Heidelberg, DE
• Edgar Weiss · Alzenau, DE

Key dates

• Filing date: Jul 21, 1987
• Grant date: Aug 9, 1988
• Expiry date: Jul 21, 2007

Classification

• Technology area (CPC Y): Emerging Cross-Sectional Technologies
• CPC primary: Y10T428/249991
• WIPO field: Basic materials chemistry
• WIPO sector: Chemistry

Abstract

A fire resistant fire-retarding laminate includes foaming-agent layers combined with at least one restricting layer, which restrains expansion of the foaming-agent layer under heat and fire exposure and improves the mechanical integrity of the composite without any substantial heat induced expansion of its own. Instead of glass or graphite fillers, special non-graphitic carbon fillers are used in fibrous or platelet-like form. Incompletely carbonized material amoung others can be used. Such fillers provide improved restraint on the expansion of the foaming-agent layer and cooperate to preserve its structural integrity.