The Heartbreak Of Cure Inhibition And How To Find Out What's Causing It скачать в хорошем качестве

The Heartbreak Of Cure Inhibition And How To Find Out What's Causing It

Sometimes you mix two liquids together and they harden because they were made to do that. Other times it does not harden. Causes of not hardening are usually not enough mixing, or unmixed stuff stuck to the side of the mixing cup, or sometimes the chemistry of a cup, spoon, dust or other contaminants will prevent the stuff from hardening. This is cure inhibition. When this happens, the best way to find out why is to make several small batches while changing one variable at a time. For example, I used smaller cups, used a syringe to measure small amounts and there is a lot of dust. Some tests were done in the new cups and some with the old ones, some used the syringe and some didn't. Some were small batches and one was larger. While any of these things would be a possible cause, batches mixed in the small cups always had some unhardened gelcoat. Transferring with the syringe into the old, larger cups did not inhibit cure. It was the little cups. Most silicone rubber will not cure in contact with polyester resin or gelcoat, but Dragonskin 10 from Smooth-on will harden in contact with gelcoat. Other kinds of silicone can cure in contact with the Dragonskin 10. Clay containing sulpher will also inhibit cure of silicone rubber, so you have to use special Sulphur free clay to model things that will be molded using silicone rubber molds.