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Explanation: IMO 'bursting disc' and 'rupture disc' (or disk for a US audience) are both accceptable. 'Diaphragm' is usually used in an engineering context (unlike an architectural context) to refer to something flexible, and bursting/discs are usually not flexible.
Ken Cox Local time: 11:29 Native speaker of: English PRO pts in category: 39
Notes to answerer
Asker: Yes, that's how we I'd use/understand diaphragm in too (both in Chemistry as well as in other contexts).