TECHNICAL WHITEPAPER Low Temperature Properties of …

Page 1 of 6 Copyright 2005 Zeus Industrial Products, Inc. TECHNICAL WHITEPAPER Low Temperature Properties of Polymers Introduction Most plastics at room Temperature show their familiar Properties of flexibility (a low Young s modulus) and high resistance to cracking but when the Temperature decreases this can change rapidly and many common plastics become brittle with low failure stresses. Low temperatures can be more harmful to plastics than high temperatures. Catastrophic failures can occur if materials selection does not take account of the low Temperature Properties of plastics. What are low temperatures for plastics? Plastics consist of long chain molecules that are entangled with one another. The degree of entanglement varies with the length and exact shape of the polymer molecule. A basic model to visualize this is to consider a bowl of cooked spaghetti it is tangled up and each strand of spaghetti can be thought of as a long chain polymer molecule.

The application requirements chart (above) also includes details of plastics that are capable of use in low temperature applications and this can be combined with the LOX compatibility chart to give first guidance on possible low temperature plastics. The fluorocarbon family (PTFE, PCTFE, FEP etc.) is particularly well suited for low temperature

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