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  1. tom1953

    Caustic soda with PTFE

    This reference https://www.finemech.com/tech_resources/chemical_resistance.pdf suggests that PTFE should be good for caustic soda (sodium hydroxide) up to 50% and up to 120C.
  2. tom1953

    Want to learn more about HNBR

    There's a Rubber Engineering Forum . . .
  3. tom1953

    Table Tennis Rubbers

    https://www.megaspin.net/store/extra/rubber-guide.asp
  4. tom1953

    Table Tennis Rubbers

    I'm not suggesting you re- or double-post, but, FYI, there is a Rubber Engineering Forum (http://www.eng-tips.com/threadminder.cfm?pid=335) that is monitored by rubber industry experts. This question might have been better posted there.
  5. tom1953

    Hydrolysis degradation of polyurethane

    Millable (solid, vulcanized) polyester urethanes with hydrolysis stabilizer can have very good, but finite, resistance to 80-90C water, the lifetime being depending on the type and level of hydrolysis stabilizer. Also, there are some new polyester grades being developed that have excellent...
  6. tom1953

    Hytrel Equivalents

    PolyOne Corporation (www.polyone.com) sells small quantities of Hytrel and other polymers. Good Luck! tom
  7. tom1953

    Fumed silica in thermoplastics

    FWIW, fumed silica does generally improve properties and abrasion resistance in vulcanized rubber compounds, typically with some silane coupling agent assisting. tom
  8. tom1953

    Material Selection for TPE/steel overmolding

    Was the TPU a polyether or polyester type? Polyester types will be very much less affected by oil than polyether types. A recent study I did showed 1-8% swell with polyester millable (solid, peroxide vulcanized) urethanes vs. 20-40% for polyether millable urethanes. Also, a vulcanized, millable...
  9. tom1953

    What particles does the Polybutadiene leave in the water?

    Unfortunately, I don't have any first-hand knowledge of NSF 61, but do know that companies (custom mixers and product manufacturers) have developed compounds that have been tested or certified to be NSF 61 compliant. I don't know if there's a listing of materials that are NSF61-compliant. Sorry...
  10. tom1953

    What particles does the Polybutadiene leave in the water?

    Presumably you're talking about balls made out of polybutadiene rubber (BR). This would mean a rubber compound which probably contains, besides the BR itself, curatives (peroxide or, more commonly, sulfur and sulfur-containing accelerators), fillers, plasticizers, process aids, and...
  11. tom1953

    Improving longevity of rubber keypad (access control etc...)

    Maybe a material that's better for abrasion resistance and tearing, like urethane, would give longer life than silicone (which isn't known for either of these properties)
  12. tom1953

    epdm foaming process

    It's a delicate balance, to be sure. I suggest you consult with your EPDM supplier for assistance. Uniroyal used to have a nice tech service center with an extrusion/hot air/microwave line where they'd fine-tune curing and foaming of EPDM compounds. That product line is now owned by Lion...
  13. tom1953

    Need advice regarding artificial rubber.

    FWIW, this might be a better topic for the Rubber Engineering forum (http://eng-tips.com/threadminder.cfm?pid=335). btrueblood, my experience (and quite a few references I've seen) is that urethanes generally have higher tear strength than nitrile rubber, and not all urethanes are "too slippery...
  14. tom1953

    HDPE Wicker

    UV exposure can definitely affect physical properties, as the effect is one of breaking polymer chains. tom
  15. tom1953

    HDPE Wicker

    It sounds like the UV protectants you're using are not adequate for your needs. Is this a new problem or a continuing one? If it's new, then maybe something has changed in the UV additives or the HDPE. If it's a continuing problem, then maybe looking at different types and/or amounts of UV...
  16. tom1953

    Plastics--Perfumes

    Chris, FYI, the link to ThermoShift http://www.phantomplastics.com/page22.php isn't working. tom
  17. tom1953

    looking for a flexible material with memory retention

    Pat, Rubber can be injection molded as well (some types more easily than others). tom
  18. tom1953

    Moldable and durable polymer with excellent UV characteristics

    EPDM rubber can be very resistant to UV when a significant amount of carbon black is included in the formula. EPDM is widely used for roofing, which typically will last several decades.
  19. tom1953

    Polymer compatibe with Carbonic acid

    There are chemical resistance charts on the Internet which should be of use, including: http://www.coleparmer.com/techinfo/ChemComp.asp http://calgasket.com/TLARGI%2022test5.htm http://www.wildenpump.com/specs/Chemical-Resistance-Guide.pdf tom
  20. tom1953

    UV and Visible Transparent Polymers

    Sorry for my apparent indiscretion, but I wanted to point out a polymer that a customer had recently done some light transmission testing on, and gotten some good results, and thought I'd mention these types of products in case the original inquirer wanted another option to consider. For future...

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