BS 231:1975
Withdrawn
A Withdrawn Standard is one, which is removed from sale, and its unique number can no longer be used. The Standard can be withdrawn and not replaced, or it can be withdrawn and replaced by a Standard with a different number.
Specification for pressboard for electrical purposes
Hardcopy , PDF
15-12-1995
English
30-09-1975
Cooperating organizations
Foreword
Specification
1. Scope
2. References
3. Definitions
4. Classification
5. Composition
6. Finish
7. Thickness
8. Density
9. Electric strength proof test
10. Tensile strength
11. Compressibility
12. Shrinkage
13. Flexibility
14. Cohesion between plies
15. Oil absorption
16. Machineability
17. Conductivity of aqueous extract
18. pH value of aqueous extract
19. Moisture content
20. Mineral ash
21. Freedom from conducting particles
22. Conductivity of organic extract
Appendices
A. Conditioning of test pieces
B. Drying of test pieces
C. Measurement of thickness
D. Determination of density and oil absorption
E. Electric strength proof test
F. Tensile strength
G. Compressibility
H. Shrinkage
J. Flexibility
K. Cohesion between plies
L. Conductivity of aqueous extract
M. pH value
N. Moisture content
P. Mineral ash
Q. Freedom from conducting particles
R. Conductivity of organic extract
Tables
1. Nominal thickness
2. Density
3. Tensile strength
4. Compressibility
5. Shrinkage in air
6. Flexibility
7. Oil absorption
8. Conductivity of aqueous extract
9. pH value of aqueous extract
10. Drying period
Figures
1. Electric strength proof test in air at 90 deg C
2. Electric strength proof test in oil at 90 deg C
3. Electrode arrangement for electric strength test
4. Compression test apparatus
5. Diagrammatic arrangement of apparatus for test
for conducting particles
6. Conductivity cell for organic extract
Four types from 0.8 to 6.0 mm with preferred thicknesses. Composition, finish, thickness, density, requirements for electrical, mechanical and chemical properties. Methods of test appended.
| Committee |
GEL/15
|
| DocumentType |
Standard
|
| Pages |
26
|
| PublisherName |
British Standards Institution
|
| Status |
Withdrawn
|
| Standards | Relationship |
| PNE-EN 20105-B02 | Identical |
| BS 970-5:1972 | Specification for wrought steels in the form of blooms, billets, bars and forgings Carbon and alloy spring steels for the manufacture of hot formed springs |
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