OK, maybe I'm covering old ground, or reopening old wounds.
I was reading wikipedia about Polyoxymethylene (POM, e.g. Delrin) which crossed my mind for some random reason, and I found this:
I proceeded to Henkel's (Loctite's) web site, and found the following:
There are also lots of other CA variants that may or may not be better than 401 for our purposes.
I think I will contact the Loctite people and ask; this looks promising enough to be worth writing them.
I was reading wikipedia about Polyoxymethylene (POM, e.g. Delrin) which crossed my mind for some random reason, and I found this:
(Underline added.) So, if it works for Delrin, does it work for Polypropylene?In order to get a high bond strength without specialized tools, treatments, or roughening, one can use Loctite 401 prism adhesive combined with Loctite 770 prism primer to get bond strengths of ~1700psi.
I proceeded to Henkel's (Loctite's) web site, and found the following:
- They do have a number of products that bear the Prism™ moniker, but 401 and 770 are no among them.
- 401 is one of many CA formulations that Loctite has.
- The product description for 770 states:
(Underline added.) "Not recommended in assemblies where high peel strength is required" worries me a bit. There is another primer, 7239, which might be better.LOCTITE® SF 770 is a primer used to make polyolefin and other low-energy surfaces suitable for bonding with LOCTITE instant adhesives. The cured performance of LOCTITE® instant adhesives is ensured on such treated surfaces. It is only recommended for difficult-to-bond substrates which include polyethylene, polypropylene, polytetrafluoroethylene (PTFE) and thermoplastic rubber materials. LOCTITE SF 770 is not recommended in assemblies where high peel strength is required.
A search for sources to buy 7239 turned up only European results.LOCTITE® SF 7239 is a colorless, solvent-based, general purpose primer that improves the bonding efficiency of instant adhesives on all plastics. It is particularly effective on polyolefin, thermoplastic rubber and other low surface energy plastics that are normally difficult substrates to bond. The primer has a good ‘on-part-life’ and provides for a good aesthetic appearance of the bond line.
There are also lots of other CA variants that may or may not be better than 401 for our purposes.
I think I will contact the Loctite people and ask; this looks promising enough to be worth writing them.