Posted: Fri Jul 29, 2011 10:02 am
In my experience, epoxy will ignore grease. It sort of pushes it out of the way. The only things I've found that it won't adhere to are polyolefins, commonly used to make heat-shrink tubing.
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If that's the case, how do people cast epoxy pistons if grease doesn't work?saefroch wrote:In my experience, epoxy will ignore grease. It sort of pushes it out of the way. The only things I've found that it won't adhere to are polyolefins, commonly used to make heat-shrink tubing.
Just make sure the bottle doesn't have an interrupted thread, otherwise you're not going to be able to get it out.aEx155 wrote:The greased bottle would be inside the fitting, and I would pour epoxy between the bottle and the fitting. That way I would have a bottle-PVC adapter instantly.
Really? I was gonna cast some epoxy around a bottle for part of my stirling engine...I know that epoxy has a hard time adhering to PET (the plastic that soda bottles are made from)
the dessicant cartridge on our FT-IR spectrophotometer at work?Gun Freak wrote:Suggestions for ~3" diameter clear pipe?
If you don't use epoxy you can still use a plastic bottle. Polyurethane-based adhesives do a better job of adhering to the plastic, and one of the most commonly used ones (in water rocketry, for gluing bottles together for longer pressure vessels) is PL Premium Construction adhesive. It does foam a bit, but if that isn't a problem, it's something you can use. Another, slightly weaker (but non-foaming) alternative is Sikaflex 11FC.Gun Freak wrote:Yeah I'll go dig one out of my closet