BS 4028:1989
Superseded
A superseded Standard is one, which is fully replaced by another Standard, which is a new edition of the same Standard.
A superseded Standard is one, which is fully replaced by another Standard, which is a new edition of the same Standard.
Specification for reusable contraceptive diaphragms
Hardcopy , PDF
08-15-1997
English
11-30-1989
Foreword
Committees responsible
Specification
0 Introduction
1 Scope
2 Classification
3 Materials
4 Design
5 Dimensions
6 Tensile properties of the rubber dome
7 Mechanical properties of rim and spring in coil
spring diaphragms and flat spring diaphragms
8 Freedom from visible defects
9 Packaging and labelling
Appendices
A Reference sampling plans and compliance levels for
assessing compliance of diaphragms with this British
Standard
B Guidance on determination of properties of diaphragms
that have been stored after purchase
C Method for determination of size
D Method for determination of dome thickness
E Method for determination of tensile properties
F Method for accelerated ageing
G Method for determination of compression resistance of
coil spring diaphragms and flat spring diaphragms
H Method for determination of twisting during
compression of coil spring diaphragms and flat spring
diaphragms
J Methods for determination of freedom from visible
defects
K Recommendations for storage of diaphragms and the use
of lubricants
Table
1 Distances for testing twisting during compression
Figures
1 Example of compression testing apparatus
2 Example of a diaphragm twist testing apparatus
3 Mounting and twisting diaphragms
4 Example of apparatus for inspection over a lamp
5 Example of apparatus for inspection by inflation
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