Historical
ISO 8009-8:1985
Reusable rubber contraceptive diaphragms -- Part 8: Determination of twisting during compression of coil spring and flat spring diaphragms
Specifies a measuring method. This method is not applicable to diaphragms with springs designed to form an arc when compressed. Compression of the rim of the article across its diameter using a suitable apparatus. Determination of the deviation of the rim from the horizontal plane.
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International Organization for Standardization [iso]