Hardware interface
Bead or flange must sit in the existing housing. A family photo is not that measurement.
custom rubber diaphragm
Use this page to decide whether a quoted custom rubber diaphragm will actually interface with the existing equipment, and which compound and ASTM or equivalent detail decides compatibility rather than preference. The layout is a decision roadmap. It is not a carbon or ESG story and it is not a contraceptive or medical product page.
Compatibility path for a custom rubber diaphragm line
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1
Seat
Record housing inner and outer seats or the drawing the factory must follow.
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2
Medium
Name the fluid or gas. Preference for a familiar compound is not a compatibility result.
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3
Temperature
Write service °F or °C. A catalogue snippet is that factory’s claim for that line.
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4
Retain
Keep the approved piece so a later production lot can be compared on the same axes.
Checks that belong on the quoted custom rubber diaphragm, not on a brochure
Compound vs medium
Nitrile, FKM, silicone and EPDM are questions against the named fluid, not a preference list.
ASTM pair
The method and the condition it was run under belong to the quoted grade. A plant ISO letter does not replace them.
Substitute rule
An alternative custom rubber diaphragm is accepted only after the changed axes are written and re-issued.
Who provides which evidence
Named factory
Dimensional page, lot test, packing and Incoterms. Origin of melt or finishing when the receiving plant will ask.
Buyer plant
Housing seats, medium, temperature, and whether a food-contact or REACH SVHC file is actually filed.
This desk
Same-basis list, visible substitutions, no invented compatibility chart and no percentage saving.
What stays unsigned
Rubber Diaphragm Sourcing does not stamp a media-resistance table as its own result.
What has to be verified before an alternative custom rubber diaphragm is accepted is the housing match, the compound against the medium, the temperature band and the document that names the quoted lot. Read the request checklist before the first factory email leaves.
Compound trade-off this desk will not settle for you
Designers sometimes ask whether a thermoplastic elastomer can replace a vulcanized rubber diaphragm to cut cycle time. That is a real selection dispute, not a slogan. A TPE or TPU insert can be useful on a low-stroke, low-temperature cover that is over-molded onto a rigid housing. A transfer-pump or regulator membrane that sees compression set, tear, and continuous heat still usually stays on crosslinked NBR, EPDM, silicone or fluoroelastomer (FKM). This desk will write both options as separate lines. It will not convert a TPE quote into a drop-in for a vulcanized custom rubber diaphragm without the buyer restating Shore A, temperature in °F or °C, and the ASTM or equivalent method.
Compression set and tear strength belong on the factory document when the buyer asked. They are not published site ratings. A plant ISO 9001 letter does not replace a lot test. REACH SVHC or FDA 21 CFR 177 files stay attached to the named grade, not to Rubber Diaphragm Sourcing.
Send the housing and the medium together
Write drawing or seats, compound ask, quantity and destination. Optional budget and supplier preference can travel with the requirement.
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