FVMQFluorosilicone Rubber
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Utilizing a one- and two-week screening process, the project team performed benchmark testing of different FVMQ rubber base technologies to understand the impact on performance properties after exposure to Dexron VI ATF at 150[degrees]C.
Starting with the correct type of FVMQ base is critical for meeting specified property-retention and sealing-performance requirements when exposed to current ATFs at high operating temperatures.
The comparative data indicated which compound technology worked best and aided FVMQ compound optimization to help achieve acceptable property retention with long-term exposure to ATFs at 150[degrees]C.
At the high end of performance and cost are constructions utilizing fluorinated polymers, such as FVMQ and FKM.
They were introduced to fulfill the performance deficiencies of standard ACM and/or AEM TDI hoses (150[degrees]C to 160[degrees]C) and provide a more cost-effective alternative to the more expensive current high-temperature solutions, such as FKM, VMQ and FVMQ hoses.
Laboratory and customer tests reveal the physical properties of FVMQ to be much less sensitive to testing at elevated temperatures when compared to FKM.
FVMQ offers high temperature and hot oil resistance while maintaining total cost.
The permeation rates of NBR, HNBR and FVMQ were compared to those of FKM, fluoroplastics and Nylon 12 using the cup method (ref.
After norrealization for thickness, the results for FVMQ were generally similar to those for a 44% acrylonitrile HNBR.
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.
Table 3 - tensile and tear data for VMQ and FVMQ vulcanizates
Hingham, MA 02043 (617) 740-2020 Richard Mastromatteo, President Woodford Garrigus, Technical Service Equipment: Three #3 Banburies, two 84" mills, three 60" mills, 40" mill, two refiners, 10", 8", 6" and 4" extruders Mixing capabilities: Specialty polymers including fluoroelastomer, fluorosilicone and silicone; specification compounding to meet ASTM, SAE, and Military requirements to FKM & FVMQ & Special alloys of FKM offered Capacity: 7.