On Tue, Sep 13, 2011 at 02:05:30PM -0600, mathog wrote: > FYI, > > Finally, I tried gluing two pieces at right angles using a high melt > hot glue. The hot glue gun > claims to run at 395F, and the glue stick was nothing special, just > generic high temperature > hot melt. Mixed results. After it cooled and was allowed to set > overnight I tried to > tear the two pieces apart by hand, pulling in opposite directions, and > they held together. > However, I was able to snap the pieces apart by folding it at the > junction. (Applying quite > a lot of torque to the junction.) The glue completely let go of the > top of the "T", all of it > stayed on the vertical part. At this point it was easy to peel the > rest of the glue off. > Seems like the bonding was good perpendicular to the surface, but > pretty weak > parallel to it. If the piece wasn't physically abused it would likely > hold together in an > air shroud. I had read somewhere that the hot glue melts the > polypropylene so that it was > effectively a weld, but that is not how it turned out with this glue. > Neither piece of plastic > was distorted where the glue had been, so clearly not melted. There > are specialty hot melts made > of polyethylene or polypropylene, and those may actually weld this > material.
This is my expectation with /consumer/ hot glues--they're good for temporary work, but are not a long-term adhesive. Did you try some of the hobby plastic adhesives? Plastruct has a "Plastic Weld" solvent cement. They list ABS, Butyrate, Styrene, Acrylic, and "more". Perhaps "more" includes your propylne. Another brand is "Tenax 7R". The former is MEK and the latter MC; both need careful handling. Finally, you could try the PVC Priming Fluid or even PVC Pipe Adhesives. These are all solvent glues and will weld the materials. -- David N. Lombard, Intel, Irvine, CA I do not speak for Intel Corporation; all comments are strictly my own. _______________________________________________ Beowulf mailing list, Beowulf@beowulf.org sponsored by Penguin Computing To change your subscription (digest mode or unsubscribe) visit http://www.beowulf.org/mailman/listinfo/beowulf
