The discussion focuses on identifying suitable materials for constructing pipes that can withstand approximately 200 psig and 250°F while being completely non-conductive. Participants explore various material options, including polymers, ceramics, and glass, considering their durability and suitability for high-temperature applications involving gases and electricity.
The discussion contains multiple competing views regarding the best material options, and no consensus has been reached on a single solution. Participants express differing opinions on the suitability and properties of various materials.
Participants highlight limitations related to the cost of materials, the need for specific designs, and the potential for contamination in high-pressure applications. There are also unresolved questions about the mechanical properties and long-term performance of the suggested materials.
This discussion may be useful for engineers, researchers, or hobbyists interested in material selection for high-pressure, high-temperature applications, particularly those involving non-conductive requirements.
rppearso said:Does anyone know of any good materials to make pipe out of that can withstand around 200 psig, 250 F and is completely non conductive? Would also be nice if it was durable to external bumps and drops as well. Was thinking carbon fiber but that won't handle high temperature.
ChaseRLewis73 said:Those specs aren't that high, your looking for either a 'high temp' polymer like teflon (they don't melt until 350-450F typically) or a ceramic.
You can also just use normal pipe with an insulating wrap depending on your need. That would probably be cheapest. Next step is teflon coated pipe then after that reinforced hightemp polymer hose.
Have to know more info to give better idea.
rppearso said:It absolutly can not be a conductor, I am going to run different experements with varoius gases at high temperatures using electricity.
Is the polymer hose ridgid or can it be made rigid? Do they make high pressure ceramic piping? Is ceramic durable?
Enthalpy said:PTFE would be very bad because it creeps horribly, even a moderate stress and room temperature.
Many plastics would perform properly at +120°C and that little pressure. Don't overkill because heat resistance is what makes plastics expensive - and they can be VERY expensive. Have a look at Matweb and Goodfellow for instance, or better, at plastic manufacturers.
One other solution is just glass. Some chemistry labs still have a craftsman capable of manufacturing any shape - or choose among existing hardware, for instance at a chemistry provider, as you'll probably find an acceptable shape among the many existing ones. With some wall thickness, 17b is easy to withstand.
Carbon fibres conduct electricity. Glass fibres would not but their resin isn't very inert and may react with you gas.
Enthalpy said:Nothing against, except things like fused silica cost an awful lot... It's made from selected quartz crystals, you know?
The cheap ceramic is glass (together with porcelain and a few more).
Enthalpy said:If you want to avoid contamination, which may well be the case for gas lasers, fused silica may be better, as it is cleaner than glass. But watch the cost!