ISO 8009-7:1985

Reusable rubber contraceptive diaphragms — Part 7: Determination of compression resistance 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 article across its diameter with a mass of 280 g using a suitable apparatus. Determination of the change in diameter after 15 s.