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As a first step, a team of Dow Corning scientists compared the effects of both Dexron III and Dexron VI on established generations (Gen 1, Gen 2) of FVMQ (fluorosilicone, FSR) elastomers.
Table 3 shows tensile and tear data for a silicone elastomer, VMQ poly(dimethylsiloxane/methylvinylsiloxane) copolymer, and a fluorosilicone elastomer, FVMQ poly(methyl-3,3,3-trifluoropropyl/methylvinylsiloxane) copolymer, containing silica filler and 10 phr MP1500.
30-33) have been published recently advocating the use of FVMQ in methanol-fuel systems because of their good low temperature flexibility and retention of physical properties over a broad range of temperature.
The unique physical properties of fluorosilicone compounds (FVMQ) have never been in greater demand than they are today.
Laboratory and customer tests reveal the physical properties of FVMQ to be much less sensitive to testing at elevated temperatures when compared to FKM.
As noted, due to the temperatures involved, the incumbent materials have traditionally been FKM, VMQ and FVMQ. Until the recent introduction of HT-ACM elastomers, there had been no cost-effective alternative material available which could bridge the gap between the standard ACM and AEM hoses operating at 150[degrees]C/160[degrees]C and these higher temperatures.
Silvan, Flexlab, Brazil; "Innovative perfluoroelastomer with improved low temperature sealing capability," Fabiano Merli, Solvay, Italy; "New family of FVMQ fluorosilicone elastomers with productivity of LSR processing," Chris Tan, Momentive; "Millable polyurethane rubber for demanding applications," Thomas Jablonowski, TSE Industries; "Advanced calendering lines for rubber goods," Renato Lualdi, Comerio Ercole SpA, Italy; "Ceramized silicone rubber composites--modification by ion bombardment," Darius Bielinski, Technical University of Lodz, Poland; "Application of environmentally-friendly surfactant in producing purified natural rubber," K.
At the high end of performance and cost are constructions utilizing fluorinated polymers, such as FVMQ and FKM.
For turbocharger hose applications, silicone rubber (VMQ) outer layers, strengthened with reinforcing fabric, are combined with a fluorosilicone (FVMQ) hose liner.
Before HT-ACM became available, sealing and hose applications requiring long-term performance in this temperature range incorporated the use of organic fluorocarbon polymer (FKM), silicone (VMQ) or fluorosilicone (FVMQ).
FSR (FVMQ) and HCR (VMQ) are crepe-like materials that are best suited for fabricating components with extruding, molding and calendering processes.
Compared with a typical silicone (VMQ) compound, the FVMQ compounds exhibit:
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