Ok, it's not baking soda. The kit "RapidFx dual adhesive system" has two components: Adhesive and Welding Powder. Adhesive appears to be a standard low-viscosity cyanoacrylate. Welding powder is a noticeably heavy white powder that seems to flow almost like a liquid in the unopened bottle (a 25 ml plastic bottle/spout of the adhesive weighs 35 grams; the similar bottle of the powder weighs about 50 grams). The MSDS I found online reveals it as 99% glass, 1% silica. Under the microscope it is almost exclusively clear beads, approximately spherical, almost all between about .003 and .006 inches diameter. Many (most ?) of them had a tiny bubble near the center; I doubt that it affects things except to reduce the density by some fraction of a percent. It is possible that the beads were coated with something. There was an occasional filament but they were clearly artifacts of production, not an intentional part of the material. So -- this is a filled material, not a reinforced one. I would expect it to be quite strong in compression but less so in tension. Tensile strength might depend strongly on the adhesive bond to the glass beads. I'll do a few rough comparison tests between glass and baking powder fillers when I have a chance. Yrs, d At 08:23 PM 5/4/2015, sailingfc @dslextreme.com wrote: >Haven't tried this stuff, but it looks to be the same as cyanoacrylate >(Crazy Glue) and common baking soda. I've used this combination for years. >Just sprinkle baking soda on the bead of liquid and you have a rock hard >glue bead. Don't use the gel crazy glue, it's too thick and won't absorb >with the baking soda, which will leave you a blob of crazy glue with no >baking soda "dissolved" in it. Great to know. I have some of the other stuff on order, if it's the same I'll cuss and let you know. Either way I'll let you know. They also have some light-cured stuff, comes with a UV flashlight. Yrs, d |
Please note - During the past 17 years of operation, several gigabytes of
Vanagon mail messages have been archived. Searching the entire collection
will take up to five minutes to complete. Please be patient!
Return to the archives @ gerry.vanagon.com
The vanagon mailing list archives are copyright (c) 1994-2011, and may not be reproduced without the express written permission of the list administrators. Posting messages to this mailing list grants a license to the mailing list administrators to reproduce the message in a compilation, either printed or electronic. All compilations will be not-for-profit, with any excess proceeds going to the Vanagon mailing list.
Any profits from list compilations go exclusively towards the management and operation of the Vanagon mailing list and vanagon mailing list web site.