Home Cosmetic Science Talk General Off Topic Polyethylene vs polypropylene plastic for caps of shampoo and emulsion products

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  • Polyethylene vs polypropylene plastic for caps of shampoo and emulsion products

    Posted by abdullah on August 19, 2022 at 1:52 pm

    up to know i was just purchasing caps locally for my products without thinking about the material. becouse of some problems i want to import it now from another county. they say the we have Polyethylene and polypropylene caps. they will be flip top caps.
    i got some information from google but i just want to know

    which cap material shoud i use or is better if the product is shampoo, emulsions and some aha and bha liquid solutions? Polyethylene or polypropylene

    by better i mean if both are ok, which one seals the closure and prevent air coming in and out better?

    abdullah replied 1 year, 6 months ago 2 Members · 2 Replies
  • 2 Replies
  • chemicalmatt

    Member
    August 19, 2022 at 5:44 pm

    Go with the Polypropylene (PP) material for closures. Those are the most common and also chemically resistant. Always check samples with your primary container neck finish too: just because the spec is 24/410 for both doesn’t mean the fitment will be same especially if there is rough flashing on threads or a neck height slightly off. Valve-seal neck finish is best but trickiest to maintain quality assurance unless you get bottle & cap from same molder.  

  • abdullah

    Member
    August 20, 2022 at 3:53 am

    Go with the Polypropylene (PP) material for closures. Those are the most common and also chemically resistant. Always check samples with your primary container neck finish too: just because the spec is 24/410 for both doesn’t mean the fitment will be same especially if there is rough flashing on threads or a neck height slightly off. Valve-seal neck finish is best but trickiest to maintain quality assurance unless you get bottle & cap from same molder.  

    thanks 

    that is a good idea to get bottle and cap from same molder.

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