[tonypol]

I am trying to find the pouring code for plastic used to make batteries, because i have a 48v battery bank made up of 24x 2v cells, and a couple of them have minor leaks were the top lid of the battery seals to the side wall. I have been unable to locate any type of sealant that can withstand the concentration of acid used in batteries, so instead I wish to match the plastic codes so I can plastic weld the joins

[rjb]

Tonypol,

The plastic used in most lead-acid batteries is polypropylene. It is fairly resistant to Sulphuric acid and should be fine for the typical H2SO4 conc. in a Pb-acid battery of 28-33%. Interesting link below...

http://www.engineeringtoolbox.com/polypropylene-pp-chemical-resistance-d_435.html

Kind Regards

R

[Enthalpy]

Some polyolefin, agreed! Polypropylene, polyethylene...

There may be an alternative. You know the white glue sold in solid rods that you apply melted by a hot glue gun? They smell paraffinic/waxy and are most probably a polyolefin - I bet it's EPDM from its elasticity and creep behaviour.

I would give this glue a try, after maybe checking EPDM's behaviour in sulphuric acid. These rods are meant to serve as glue and make easily good tight joints - it needs less training than plastic welding.

And once you have such a glue gun, you'll use it everywhere, it's just a nicely working toy.