TPE, TPV or TPA--Plastic Material Selection Help!! 2

[mong1234]

I am trying to find a replacement plastic material with the following properties:

1. Injection Moldable
2. Shore A hardness between 30 and 45
3. UV-Stable
4. Temp. range of -40F to 180F
5. No mineral oils used in construction

Tried using Krayton (DYNAFLEX G7930-1001-0) and Santoprene 8211-35; which both have the physical properties we need; but ended up leeching oils past 80F.

Want to use this material in a form of a molded gasket between 2 fiberglass profiles--and are having issues with the mineral oils from the current material (Krayton) leeching into the fiberglass over time.

Need some suggestions on material options for this gasket (it has a failry complicated 3d profile).

 

[patprimmer]

Polyurethane

Liquid Silicone Rubber (well sort of injection mouldable with the correct equipment).

Polyester block elastomers such as Hytrel or Arnitel (the softest grades might just qualify, but I am out of date on current range availability).

Regards
Pat
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[Pud]

Agree with Pat - PU or polyester TPE.

Note that both are very critical regarding moisture content prior to moulding.

Cheers

Harry

http://www.tynevalleyplastics.co.uk