IASH Community Forum : Specifications, testing and test methods
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 Subject : Polymeric material compatibility tests.. 11/17/2021 11:12:35 AM 
Dr. Mickael Sicard
Posts: 2
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Dear all,

I have a question about the dimensions of the O-rings tested during the certification of alternative fuels (ASTM reports). I have not found it. Does anyone have the information?
In our compatibility studies, we use seals with dimensions of 25.12 x 1.78 (mm).

Thanks in advance for your help.
Best regards,

Mickaël.
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 Subject : Re:Polymeric material compatibility tests.. 11/19/2021 07:39:47 AM 
Dr. Robert E. Morris
Posts: 11
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In the Navy alternative fuel fit for purpose protocol for diesel fuel, o-rings are to be tested in accordance with ASTM D1414, which does not explicitly define the size of the test o-ring.

Sec. 10.3: "Test Specimen- shall be a suitable section cut from the sample O-ring. A 52 mm section has been found to be satisfactory on sample O-rings of 17 mm or larder I.D. On smaller O-rings, a section of approximately 3 mm shall be cut from the sample and discarded."

It is also noted in D1414 that testing of whole O-rings is not recommended because of air entrapment inside the O-ring, causing different conditions on the inside and outside surfaces.

I know the USAF has done a lot with material compatabilty; check some of the earlier IASH conference proceedings.
 Subject : Re:Polymeric material compatibility tests.. 12/06/2021 11:16:48 AM 
Dr. Steven Zabarnick
Posts: 2
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John Graham should be able to help you. [email protected]
 Subject : Re:Polymeric material compatibility tests.. 12/06/2021 11:33:34 AM 
Dr. Mickael Sicard
Posts: 2
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Many thanks Steve!
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 Subject : Re:Polymeric material compatibility tests.. 12/16/2021 05:01:07 PM 
Ms. Melanie Thom
Posts: 2
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The o-ring testing being done in aviation gasoline also has the same "open" selection of o-ring sizes. I personally have found that using -226 for tensile/elongation and -210, cut, for compression set works well. This doesn't provide any information for testing already done in jet fuel, but gives a nice place to start for any future testing.
 
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