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Re: A negative report regarding SVO
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Okay, so now we need to hear from someone who knows whether or not EDPM - the most common material for pump diaphragms - is or is not affected by B100.
In plumbing systems, it is EDPM, and NOT butyl rubber, that you want to have in contact with the glycol - either ethylene or propylene glycol - that runs through heat systems. A different kettle of fish, for sure, but I can't find my website for the chemical compatibility of various "rubbers" and "plastics"...
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A reference I checked has this to say:
Butyl Rubber, Ethylene Polypropylene Rubber, e.g. EPDM, EPT, EPR: Good resistance to ozone and weather. Especially suitable for aggressive chemicals. <font color="red"> Unsuitable for oils and fats. </font>
In another spot, it lists for diesel oil (they don't list biodiesel)
Buna-N: resistant to 104 F
EPDM, EPT: Not recommended
Neoprene: conditionaly resistant to 68 F
Viton: resistant to 104 F
I'm wondering about the lower temperature limits for Buna-N and Viton in this reference. I believe PSD injector o-rings are made of Viton (or maybe Buna-N), and they operate at well above 104 F.
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