British Standards Institution

Phenolic Moulding Materials
 N BS 771

Annotation

General

This International Standard specifies requirements for the physical and chemical properties of phenolic moulding materials, classified by type and grade according to their use and properties.

Types

Four types of phenolic moulding material are specified, as follows:

— Type A: General purpose

— Type C: Heat resistant

— Type D: Impact resistant

— Type E: Electrical applications

Filler

The type of filler to be used in each type of phenolic moulding material is not specified.

Resin

Abbreviations are used to indicate the type of phenolic resin, as follows:

— One-step phenolic resin: PF 1

— Two-step phenolic resin: PF 2

Grades

The various types of material are further sub-divided into grades based on the property levels and requirements.

EXAMPLE

PF 2A1 is a phenolic moulding material made from two-step resin, intended for general applications. The last digit indicates a particular grade of one type of material.