mabuse00 Posted July 25, 2020 Posted July 25, 2020 Another thing that just came to my mind:It is common practice to treat paper "nozzles" like the sidevents of hummers, stingers ect. with sodium waterglass to prevent paper erosion somewhat.The sodium variant is the most common, most readily available - because it is the cheapest.For the amounts we use, the price is irrelevant. So how about potassium- or lithium silicate?Have you ever compared all the three in terms of effectiveness in fireproofing and usability?
markx Posted August 5, 2020 Posted August 5, 2020 The following article might shed some light on the aspects regarding different silicate based solutions: https://core.ac.uk/download/pdf/26204220.pdf The potassium variety might be usable pretty much similar to the more common sodium silicate, but lithium forms an insoluble compound. As it turns out it is still possible to produce a colloidal form of the Li variety that remains in solution...
mabuse00 Posted November 17, 2020 Author Posted November 17, 2020 Interesting would be a comparison in heat resistance, but I havent found such information nowhere. Anyway:A bottle of lithium waterglass is ready for action. If anybody has some opinions on how a comparison with the sodium variant should idially be executed, please let me know...Focus is on typical pyro problems, papernozzles of stingers, hummers and such...My approach would be to press BP in tubes, drill holes and treat them, check out the erosion. Since additives tend to worsen the problem, repeating the test with Ti and coloured compositions comes to mind...
mabuse00 Posted March 13, 2022 Author Posted March 13, 2022 Meanwhile I made a comparison.My conclusion is that (at least in my test setups) waterglass does not help at all.I compared 10mm ID tubes with 2mm sidevents, with whistlemix and good BP, with sodium-, lithium- and without waterglass.When used, the waterglass was applied generously so it could soak into the holes.In each case, the tubes treated with wasterglass had identical erosion than those without.Do you have an opinion on that?Have you guys ever determined any advantage from waterglass?
Richtee Posted March 13, 2022 Posted March 13, 2022 (edited) I treat my cardboard mortar tubes with it. And, I’m trying it to prevent case burn thru on model rocket motors. Seems to help there. I don’t think one could get enough concentration for the hellfire of a nozzle to make much difference. Edited March 13, 2022 by Richtee
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