BS 771:1992
Current
The latest, up-to-date edition.
Specification for phenolic moulding materials
Hardcopy , PDF
English
15-11-1992
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Committees responsible
National foreword
Specification
1. Scope
2. Normative references
3. Definitions
4. Requirements
5. Test specimens
6. Methods of test
7. Marking
Tables
1. Classification
2. Limits on properties of phenolic moulding materials
Specifies requirements for the chemical and physical properties of phenolic moulding materials, classified by grade and type according to their properties and use. Coverage includes: definitions, marking and test specimens. Also includes detailed tables.
| Committee |
PRI/42
|
| DevelopmentNote |
Also numbered as ISO 800 Supersedes 86/40314 DC, BS 771-1(1980) and BS 771-2(1980) (10/2005)
|
| DocumentType |
Standard
|
| Pages |
14
|
| PublisherName |
British Standards Institution
|
| Status |
Current
|
| Supersedes |
1.1 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.
1.2 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
1.3 Filler
The type of filler to be used in each type of phenolic moulding material is not specified but is usually as shown in the following examples:
| Type of moulding material | Filler |
| A | Wood flour |
| C | Mineral filler |
| D | Cotton |
| E | Mica |
1.4 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
1.5 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.
1.6 Classification
Table 1 shows the types and the grades of phenolic moulding material covered by this International Standard, together with their applications and distinguishing properties.
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