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O-ring Oring o ring kit 0ring O’ring orang O-rings Orings 0rings O’rings orangs o rings kit gasket gaskets custom molded splice and vulcanized vulcanize compression molding mold molded FFKM Perfluoroelastomer Kalrez Canrez chemraz chemrez perlast kyflon parofluor parfluor FKM F FKM A FKM B FKM GF FKM GLT FKM GFLT FKM ULT FKM ETP VITON F VITON A VITON B VITON GF VITON GLT VITON GFLT VITON ULT VITON ETP NBR Buna-N BunaN Nitrile HNBR hydrogenated nitrile EPDM ep Aflas tfep tfe/p silicone silicon sil VMQ pvmq Fluorosilicone fluorosilicon fsil FVMQ polyurethane au PU Teflon PTFE FEP PFA Neoprene chloroprene SBR ACM Butyl Butadiene Isoprene Natural Rubber Hypalon PEEK ABS PETG PET Plastic rubber elastomer injection molding polycarbonate O-ring o-ring O ring oring 0-ring O’ring orang O-rings Orings 0rings O’rings orangs o rings Kit kit Gasket gasket gaskets gaskit Custom Molded custom molded custommolded Splice splice Vulcanized vulcanized vulcanised Vulcanize vulcanize vulcanise Compression Molding compression molding compression moulding Mold mold mould Mo O-ring supplier O-ring manufacturer O-rng suplier O-rng manufacturer O-ring suppliar O-ring manufacturar O-rign supplier O-rign manufacturer O-ring suplier O-ring manufacturer O-ring suppplier O-ring manufacturerr O-ring suppplier O-ring manufacturar O-ring supplier O-ring manufacturor O-ring suplier O-ring manufakturer O-ring supplier O-ring manufactorer O-rng supplier O-rng manufaturar O-ring Oring o ring kit 0ring O’ring orang O-rings Orings 0rings O’rings orangs o rings kit gasket gaskets custom molded splice and vulcanized vulcanize compression molding mold molded FFKM Perfluoroelastomer Kalrez Canrez chemraz chemrez perlast kyflon parofluor parfluor FKM F FKM A FKM B FKM GF FKM GLT FKM GFLT FKM ULT FKM ETP VITON F VITON A VITON B VITON GF VITON GLT VITON GFLT VITON ULT VITON ETP NBR Buna-N BunaN Nitrile HNBR hydrogenated nitrile EPDM ep Aflas tfep tfe/p silicone silicon sil VMQ pvmq Fluorosilicone fluorosilicon fsil FVMQ polyurethane au PU Teflon PTFE FEP PFA Neoprene chloroprene SBR ACM Butyl Butadiene Isoprene Natural Rubber Hypalon PEEK ABS PETG PET Plastic rubber elastomer injection molding polycarbonate O-ring o-ring O ring oring 0-ring O’ring orang O-rings Orings 0rings O’rings orangs o rings Kit kit Gasket gasket gaskets gaskit Custom Molded custom molded custommolded Splice splice Vulcanized vulcanized vulcanised Vulcanize vulcanize vulcanise Compression Molding compression molding compression moulding Mold mold mould Mo O-ring supplier O-ring manufacturer O-rng suplier O-rng manufacturer O-ring suppliar O-ring manufacturar O-rign supplier O-rign manufacturer O-ring suplier O-ring manufacturer O-ring suppplier O-ring manufacturerr O-ring suppplier O-ring manufacturar O-ring supplier O-ring manufacturor O-ring suplier O-ring manufakturer O-ring supplier O-ring manufactorer O-rng supplier O-rng manufaturar

  • Ian L

PVMQ Silicone - Material Profile

Updated: Dec 5, 2023

When it comes to Silicone O-rings and custom parts, most are familiar with standard VMQ Silicone or FVMQ Fluorosilicone. Less recognized is PVMQ Silicone, which is specifically formulated for extreme low temperature applications. Learn more about what makes PVMQ so special.



PVMQ Low Temperature Silicone O-ring

Common Types of Silicone


Silicone rubbers are silicon and oxygen (siloxane) based synthetic polymers. They are typically weather resistant and have versatile temperature ranges, but are limited by low abrasion resistance and tensile strength.

  • MQ Silicone: Methyl Silicone (MQ) is a relatively simple form of silicone rubber. MQ is not frequently used to manufacture O-rings and custom rubber parts due to it's lacking mechanical properties, however it can be processed to improve its characteristics.

  • VMQ Silicone: Vinyl Methyl Silicone (VMQ) is the most common form of silicone rubber. It has a versatile functional temperature range (typically around -60°C to 200°C) and good compression set, but still has mechanical limitations like poor abrasion resistance and relatively low tensile strength.

  • FVMQ Silicone: Fluorosilicone (FVMQ) is as it sounds: A fluorinated silicone polymer. As with other fluorinated polymers, FVMQ's molecular structure has improved stability, lending the material improved chemical resistance over standard VMQ. Unfortunately, FVMQ also has a slightly reduced temperature range (typically around -60°C to 175°C).

  • PVMQ Silicone: Phenyl Methyl Silicone (PVMQ) is a formulation of silicone that greatly improves the materials low temperature capabilities (typically around -80°C to 200°C).


What makes PVMQ Special


In standard MQ silicone, two methyl groups are bound to the siloxane backbone. This forms the primary structure of the polymer. With VMQ, some of the methyl groups in MQ are replaced with vinyl groups. One step further with PVMQ, some of the methyl groups in VMQ are replaced with phenyl groups.


As the blend ratio of phenyl groups are increased, the ratio of crystalized polymeric groups to amorphous polymeric groups is shifted, altering the materials physical properties and glass transition temperature. [1] The resulting PVMQ has a decreased tensile strength, modulus at 100%, and compression set. This equates to a mechanically worsened material. However, the low temperature performance of PVMQ is greatly improved by an extremely low glass transition temperature in relation to other silicone blends. [1]



Where can I get PVMQ parts?


With the request a quote page, you can get directly in contact with our team of specialists who will help get you the parts you need.



Sources:


[1] Lee, Jin Hyok, Jong Woo Bae, Myoung Chan Choi, Yu-Mi Yun, and Nam-Ju Jo. “Effect of Phenyl Vinyl Methyl Silicone (PVMQ) on Low Temperature Sealing Performance of Fluorosilicone Composites.” Elastomers and Composites 56, no. 4 (December 31, 2021): 209–16. doi:10.7473/EC.2021.56.4.209.


[2] Silicone rubber (Q, MQ, VMQ, PVMQ). (n.d.). Parker Hannifin Corporation. https://promo.parker.com/promotionsite/oring-ehandbook/us/en/ehome/Silicone-(Q,-MQ,-VMQ,-PVMQ)


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