Plastics properties in general vary considerably. The conductivity will vary depends on the drying process of the paint. If you need only an approximation, the manufacture would give you a range. For specific value you will have to test it yourself. I have found that if the paint was applied in...
For joul Tomson effect to take place, the gas has to expand from high pressure to low pressure. The temperature of expanded gas can be found from the gas tables distributed by NIST. You take the difference between the enthropy at two state and using C calculate the change in tepmerature. Fast...