In fact, PMQ silicones have almost a 100☌ lower operating temperature than the equivalent MQ silicone, with a working temperature of -100☌. With this compound, the methyl groups are replaced with phenyl groups, which dramatically improves the low operating temperatures of the material. However, its poor tensile strength means it’s not suitable for some O ring fabrication.Īlso known as PVMQ, this is phenyl methyl silicone. The resulting material has an impressive temperature range and better compression set than MQ. It is produced by processing MQ silicone into a format where the methyl groups of molecules are replaced with vinyl ones. However, it is sometimes used as a base and them processed to improve performance. We don’t often use this type of silicone in this format, as it doesn’t have the best elastomeric properties. At a molecular level, it contains repeating units of oxygen, which gives it excellent resistance to ozone, as well as UV and general damage from weathering. To give it its full name, this is methyl silicone, and is the simplest form of silicone compound. Specifically, we’ll consider MQ, VMQ, PMQ and FVMQ to see what they are and what benefits they can bring to components. We’re going to look at four of these compounds in more detail today. Standard silicone O rings are capable of handling temperatures from -60☌ to 230☌, whereas specialist compounds can be made to reach as low as -100☌ and as high as +300☌. It has amazing flexibility, low toxicity and excellent resistance to UV, oxygen, ozone and microbial growth.įor O ring materials, silicone has one of the greatest ranges of operating temperatures available. Silicone is widely used in a variety of industries, from food and medical to aerospace and more. As such, it’s key that you’re familiar with these names and the properties of such materials in order to use the right variant for the job. However, there are standardised names for the materials we use, as defined by the ISO. To an outsider, the names of some compounds can seem like a foreign language, potentially leading to confusion and misinterpretation. The world of silicone rubber is full of confusing acronyms.
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