Is a fluoroelastomer designed to retain the high heat and the chemical resistance of general use grades of Viton® fluoroelastomer, while improving the low temperature flexibility of the material.
Viton is a brand of synthetic rubber and fluoropolymer elastomer commonly used in O-rings, chemical-resistant gloves, and other molded or extruded goods. The name is a registered trademark of DuPont Performance Elastomers L.L.C. . Viton fluoroelastomers are categorized under the ASTM D1418 and ISO 1629 designation of FKM. In the toughest of environments – amid high temperatures and harsh chemicals – Viton™ fluoroelastomers provide peak performance and resistance. Specified for fuel systems seals and hoses, O-rings, and gaskets, Viton™ fluoroelastomers can outperform the competition. Viton™ with APA.  Viton ® GFLT, like Viton ® GLT, exhibits significantly improved low temperature flex characteristics compared to standard types of fluoroelastomer. In addition, Viton ® GFLT provides the same superior resistance to fluids that is typical of the F types of Viton ® fluoroelastomer. Types of DuPont ™ Viton ® Extreme ™ Fluoroelastomers that contain copolymerized vinylidene fluoride(VF2) are subject to attack by high pH materials, including caustics and amines. Viton ® Extreme ™ ETP-600S is a copolymer of ethylene, tetrafluoroethylene (TFE), and perfluoromethylvinyl ether (PMVE). This unique combination of monomers provides outstanding resistance to fluids and is an example of an ETP polymer. There is a range of GLT products to accommodate various processing conditions. Viton® GFLT: Viton® GFLT is a fluoroelastomer designed to retain the high heat and the superior chemical resistance of the GF High Performance types, while improving the low temperature performance of the material. Viton® GFLT shows a 6 to 10°C lower Tg than general use Viton® grades. Glass transition temperatures (Tg) of materials are indicative of low temperature performance in typical elastomer applications. Viton® GLT shows an 8 to 12 C lower Tg than general use Viton® grades. There is a range of GLT products to accommodate various processing conditions. Viton® GFLT:Viton® GFLT is a fluoroelastomer designed to retain the high heat and the superior chemical resistance of the GF High Performance types, while improving the low temperature performance of the material. Viton® GFLT shows a 6 to 10 C lower Tg than general use Viton® grades.  Viton® GLT: Viton® GLT is a fluoroelastomer designed to retain the high heat and the chemical resistance of general use grades of Viton® fluoroelastomer, while improving the low temperature flexibility of the material. Viton® GFLT: Viton® GFLT is a fluoroelastomer designed to retain the high heat and the superior chemical resistance of the GF High Performance types, while improving the low temperature performance of the material. Viton® GFLT shows a 6 to 10°C lower Tg than general use Viton® grades. Fluorocarbon (FKM). Fluorocarbon is a well-known high performance rubber. It has excellent resistance to high temperature, ozone, weather, oxygen, mineral oil, fuels, hydraulic fluids, aromatics and many organic solvents and chemicals. Viton GLT has a more broad usable thermal range of -45 C to +275 C and outstanding in aggressive HTS-type oils, applied in aerospace applications. Viton ETP is usually applied in the chemical industrial field. Viton is generally compatible with hydrocarbons, but incompatible with ketones such as acetone, and organic acids such as acetic acid. O-rings made of Viton are typically color-coded as black, but new gaskets, seals and O-rings should be green FKM or black FKM, but with a green mark on the outer edge. Viton fluoroelastomers are categorized under the ASTM D1418 and ISO 1629 designation of FKM. Viton V91A O-Rings. Viton® (fluorocarbon rubber) has excellent resistance to high temperatures, ozone, oxygen, mineral oil, synthetic hydraulic fluids, fuels, aromatics and many organic solvents and chemicals making it a good choice for an o-ring material. Low temperature resistance is normally not favorable and for static applications is limited to approximately -15 °F (-26 °C) although in certain situations it is suitable down to -40 °F (-40 °C) Under dynamic conditions, the lowest service temperature is between 5 °F and 0 °F (-15 °C and -18 °C).
https://en.wikipedia.org/wiki/Viton https://www.chemours.com/Viton/en_US/ http://globaloring.com/Downloads/Viton-Selection-Guide.pdf http://www.pspglobal.com/nfvitongrades.html https://www.oringsusa.com/html/viton.html http://www.pspglobal.com/nfvitongrades.html http://www.alliedmetrics.com/seals/o-rings/viton-o-rings.php https://en.wikipedia.org/wiki/Viton http://viton-orings.com/
what is glt material