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Polyethylene vs polypropylene plastic for caps of shampoo and emulsion products
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 knowwhich 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?
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2 Replies
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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.
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chemicalmatt said: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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