PTFE low temperature resistance features and notices
PTFE is an excellent material with high and low temperature resistance. We usually see the temperature performance is -196 ℃ ~ 260 ℃ in the data sheet. Then PTFE can really resist low temperature -196 ℃ ? Taifno will answer for you as following.
The answer is yes. However, PTFE in the process of temperature drop, to-196 ℃ will occur serious embrittlement. Actually, the hardness, strength, size, distortion and other aspects of the PTFE material will be changed with temperature drop.
We all know that PTFE at high temperature, its size changes larger, pure PTFE dimensional stability needs to be improved. Teflon at low temperatures, there are also dimensional instability. In general, the lower the temperature, the harder it will harden, the easier the material will be to become brittle and the size shrinkage rate will increase. In low temperature conditions, the relative deflection will be smaller. Therefore, PTFE in refrigeration machinery, low temperature freezers, vacuum seals and other environments work, the design should consider its low temperature resistance performance and size changes on the strength, sealing effect. And the dimensional change at low temperature resistance is a non-linear change, different specifications and shapes of PTFE products,the dimensional change rate is not exactly.
In general, PTFE is able to withstand temperatures as low as -196 ° C, because of the cold shrinkage of PTFE which increases with decreasing temperature, too low temperature conditions often result in PTFE hardening, embrittlement or overall shape shrinkage during use, such as vacuum sealing products ,due to the temperature is too low, the seal may fail after shrinking, so considering its strength and rate of change of low temperature shrinkage, we recommend safe low temperature control within -70 ℃.