Polysulphide Compatability

[vonsteimel]

I'm looking for details related to Polysulphide Sealants and their compatibility with specific plastics.

I've spent about an hour googling and cannot not find reference to their compatibility with Polypropylene and Polyethylene. I've looked at MSDS & TDS and everything in between. There is specific mention not to use Polysulphide Sealants with ABS, PVC and Polycarbonate but no mention about Polypropylene and Polyethylene. From the TDS's I've seen, Polysulphide Sealants are safe to use on Nylon & Epoxy plastics but what about Polypropylene and Polyethylene?

I'm not really looking for alternatives, as I've got a bunch of Polysulphide and want to use it on Polypropylene and Polyethylene in a variety of applications.

Will Polysulphide "attack" Polypropylene or Polyethylene?
Thanks,

VS

 

[unclesyd]

I check all my literature on Polysulfide Marine Caulk and none of them list any polyolefin as a candidate for using the caulk.
I've nver seen it tried on polyrthylene or polypropylene in or around the boatyards/ It maybe possible to use it if you can use a surface activator ofr the olefins. Even then it would be a touch and go proposition.
In our Electolytic Chemical process we has numerous part made from polyethylene and polypropylesne and we never tried to use an adhesive for component stack up.
Having said all of the above, they do use an adhesive for some polyerthylens, UHMW. The 3M material uses acrylic or rubber adhesive.for their tapes.

You might do search for "activator for polyolefins".

 

[cczechowicz]

Polyethylene and Polypropylene are the two most difficult materials to stick to due to their low surface energy.
3M has a 9495LE Double coated product or 9472LE transfer adhesive which is your best bet.