Bonding polypropylene?
 

Seems a lot of bits on bikes are made out of polypropylene (PP) which is, I've read, a difficult plastic to bond as it is resistant to a lot of adhesives / solvents.

My question is whether Araldite will work? more specifically the slow cure precision one, not rapid set.

Re: Bonding polypropylene
 

Hmmmmmm, I suppose it's worth a try, if it's all you've got, I generally use this stuff, in th crack and if needed plastic weld the back.

Cheers Mark.

Re: Bonding polypropylene
 

Thing is, if it's not going to work I'm not going to risk it. One of the headlight lugs has snapped so if it wont glue I have to order a whole headlight... at quite some expense...

Re: Bonding polypropylene
 

As said I use the two part stuff I linked to, that works most of the time, but if you'll have to order a new one, no harm trying is there ?

Re: Bonding polypropylene
 

You can buy PP specific two part adhesive, when I used to use it in my last job I got it from rs components www.rswww.com.

Depends what you expect from glue, structual stuff I would buy as above, if it's just cosmetic stuff that wont be subject to any stress then araldite will be fine IMO .

Re: Bonding polypropylene
 

It holds the headlights in place so I'd say structural. I might just pick up some new ones to be on the safe side but have just tested some araldite on 2 pieces of PP and will let it go off overnight...

Re: Bonding polypropylene
 

Plastic weld it

Re: Bonding polypropylene?
 

Have managed to do this on my old SV using industrial strength glue.

Re: Bonding polypropylene
 

I test ran another bit of PP with araldite, flexed it a bit this morning and it snapped, not strong enough.

I don't have a plastic welder and they look pricey, more expensive than just getting a new headlight.

Think I'll just bite the bullet and sell mine on eBay to someone with the gear to fix it.

Re: Bonding polypropylene?
 

£5 for a cheap soldering iron, less than a decent bottle of glue ;)