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I cannot say for certain so take my advice with a grain of salt, but if you cannot use PTFE, than HDPE is almost as good. Very few chemicals I have ever used have ever interacted with it and if you need something unreactive, HDPE is a pretty safe bet on top of being abundantly available. PET, although very transparent, is very hit and miss when it comes to ...


Your link almost certainly explains the alkanes. It says commercial paraffins are mostly in the 22 to 38 range That's exactly the range we are seeing in the chromatogram. I'd consider this the answer.

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