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 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?