On Tue, Sep 4, 2018 at 2:11 AM Björn bjornmail@gmail.com [harryproa] <harryproa@yahoogroups.com.au> wrote:
So what are the downsides to low viscosity?Higher price?
generally, but I have found an Aus supplier who sells it at about the same price as his 'normal' epoxy, both of which are considerably cheaper than the usual suppliers, whose infusion prices are usually about 30% higher than their 'normal'.
Lower strength?
Can be. The stuff above is a little less strong, but not enough to make a difference in what we are doing.
More toxic?
Seems to be. The viscosity is lowered by adding a diluent, which ideally is reactive. The infusion resins I have used have been smellier than conventional and more aggressive in terms of attacking plastic containers and gloves. The current hardener, if poured into a container, evaporates and leaves a white sludgy powder.
What makes normal epoxy thicker, and these special infusion versions thinner?
Raw epoxy is viscous. Diluents are added to make it usable. 100% reactive in WEST and similar, solvents in "rot proofing" epoxies.
Which leads to the question, "why don't we add solvent to normal epoxy and use it for infusion". The vacuum will boil off the solvent leaving the resin. The solvent would probably not be very good for the vac pump oil, and would be a fire risk. It is on the list of things to try.
On Fri, Aug 24, 2018 at 11:06 PM '.' eruttan@yahoo.com [harryproa] <harryproa@yahoogroups.com.au> wrote:I think many epoxy vendors treat infusion as a buzz word.
I have vendors tell me all about their infusion epoxy with a 600+ cps. Seems ridiculous, or they are doing some other type of one sided infusion, perhaps.
Boatdesign has posts from years ago suggesting 300 cps is the max to infuse with, and i imagine less is more.
I mean, yes, i guess it is possible to do with thicker, but certainly as the part grows in size and complexity, where you are more pushing the limits, the low cps and longer gel.
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Posted by: Rob Denney <harryproa@gmail.com>
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