BS 3497:1979

Foreword
Cooperating organizations
Specification
0. Introduction
1. Scope
2. Definitions
3. Finish
4. Flatness
5. Preferred nominal thicknesses and permissible
    deviations
6. Flatwise electric strength at a temperature of
    90 deg C for boards of nominal thickness up to 25 mm
7. Surface electric strength at a temperature of
    90 deg C
8. Arc resistance and combustibility tests
9. Resistance to flatwise compression
10. Crushing strength
11. Flatwise shear strength
12. Flexural strength
13. Machinability
Appendices
A. Conditioning of test pieces
B. Flatwise electrical strength at a temperature of
    90 deg C for boards of nominal thickness up to 25 mm
C. Surface electrical strength at a temperature of
    90 deg C
D. Carbon arc test
E. Spirit burner test
F. Resistance to flatwise compression
G. Crushing strength
H. Flatwise shear strength
J. Flexural strength
Tables
1. Limiting values for carbon arc test
2. Limiting values for flexural strength
3. Dimensions and drying times for test pieces for
    flatwise electric strength test
Figures
1. Limiting values for flatwise electric strength test
2. Circuit diagram for carbon arc test
3. Apparatus for carbon arc test
4. Spirit burner
5. Shear strength assembly of punch, die and bolster
6. Arrangement of test piece for flexural strength test

Requirements and preferred nominal thicknesses (3 mm to 50 mm).