View Full Version : Bonding plastic and rubber
07-23-2009, 06:36 AM
I need to bond some 0.5mm nitrile rubber to black plastic sheet.
Which plastic is as yet undecided on one end, and likely to be SLS Nylon on the other end. Id prefer Black plastic. This is to make a rubber bellows to seal out stray light and dust form in front of a lens.
Ive tried a few googles, but Im having a hard time coming up with an actual adhesive to do this. because I could do with having black plastic my options seem limited to acetal / UHMWPE in easily available plastics. (not easy to glue...)
The part is a flat plate 6mm thick.
Any suggestions gratefully recieved
07-23-2009, 06:53 AM
I know that 3M has a glue that is specifically for nitrile rubber.
I think it was this, but I'm not sure.
Sometimes, glues might have nitrile in the name, but that doesn't necessarily mean it bonds to them.
Not sure about the plastic end. You might want to give them a call as they are pretty knowledgeable.
07-23-2009, 08:06 AM
Try this site. It may provide the information you need.
It's basically a site to glue anything to anything.
07-23-2009, 08:32 AM
Just checked rubber to plastic on the chart, if the "Barge Glue" recommended is the same stuff we used to glue speaker cloths to frets with, it's like the proverbial sh!t to a blanket. A glue sniffers dream.
07-23-2009, 09:56 AM
Just about anything to anything
And the grandaddy of glue advice sites as already been mentioned
If you can't find among those you probably can't glue it
Loctite "All plastics" works very well. It will even glue teflon as I have found in my experiments. Bond shear strength is around 4000 to 6000 psi.
07-23-2009, 02:10 PM
thanks all, got some pointers now :)
shame the loctite doesnt appear to be available in bigger bottles
Acetal glues just fine with ordinary cyanoacrylate adhesives. You can buy those by the gallon. I imagine that the Loctite product is available in larger quantities if you check with a distributor.
07-23-2009, 03:01 PM
Where do you get cyanoacrylate glue by the gallon Evan?Alistair
07-23-2009, 04:09 PM
You can get larger quantities of CA at woodworking supply places that cater to industry. We used it to assemble crown molding, and it's good stuff. Ours came with a spray can of accelerator. It was a fairly handy way to hold things together.
Hobby shops used to sell larger quantities as well, I think one name for it was Zap.
As I said earlier you can buy large quantities from a distributor. Loctite products for instance are avialable in up to 2 kilogram bottles int the range of 800 to 900 dollars. That works out to less than 50 cents per gram as opposed to the usual retail price in consumer packages of around $2 per gram for Loctite products. Smaller quantites are also available with many of the products in 1 lb bottles for $150 to $200. Loctite is high priced though.
The Chinese are making very good glues lately. It seems they have a particularly high level of expertise in the chemical and biochemical industries. DX sells 20 gram bottles of cyanoacrylate glue for $1.81 usd.
07-24-2009, 07:29 AM
Im not sure why I didnt think of CA... but anyway I glued some test pieces last night and the ordinary CA we have here works fine. Plenty strong enough :)
Don't put the bellows anyplace near a lens untill the CA has had a chance to very completely outgas. Leave it well aways for several hours or else you run a high risk of fogging the optics. Trust me, I know from experience. :rolleyes:
07-24-2009, 02:35 PM
That would be the white traces you get from CA sometimes I assume.
Ill try not to b**ger the optics, the Projectors are not cheap, about 5K ea IIRC, and similarly the camera lenses are not cheap either....