BS 234:1971
Withdrawn
A Withdrawn Standard is one, which is removed from sale, and its unique number can no longer be used. The Standard can be withdrawn and not replaced, or it can be withdrawn and replaced by a Standard with a different number.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 loaded and unloaded ebonite for electrical purposes
Hardcopy , PDF
15-11-1997
English
25-06-1971
Cooperating organizations
Foreword
Specification
1. General
1.1 Scope
1.2 Compliance
1.3 Finish
1.4 Freedom from embedded metallic particles
1.5 Machining
2. Dimensions and tolerances
2.1 Dimensions of sheets, rods and tubes
2.2 Tolerances on dimensions
3. Test requirements
3.1 Test pieces
3.2 Plastic yield
3.3 Cross-breaking strength
3.4 Permittivity and loss tangent (tan delta)
4. Supplementary test requirements
4.1 Electric strength
4.2 Leakage resistance
Appendices
A. Proof test for plastic yield
B. Determination of cross-breaking strength
C. Permittivitiy and loss tangent (audio-
frequency test)
D. Permittivity and loss tangent (radio-
frequency test)
E. Proof test for electric strength
F. Leakage resistance test
Tables
1. Dimensional tolerances for sheets
2. Dimensional tolerances for rods
3. Dimensional tolerances for tubes
4. Maximum variation in wall thickness of any one
tube (all types)
5. Test requirements
Figures
1. Plastic yield test piece
2. Plastic yield test piece in clamp
3. Electrodes for permittivity and loss tangent
test (audio-frequency)
4. Schering bridge for permittivity and loss
tangent tests
5. Electrodes for electric strength proof test
6. Recommended system of electrodes for leakage
resistance test
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