Sealing technology manual for the process industry - VMQ

Products and materials • O-rings made of 70 VMQ 117055 and 78 VMQ 166898 • Molded parts made of 70 VMQ 117055 and 76 VMQ 176643 • Diaphragms made of 70 VMQ 117055 • Clamp seals made of 70 VMQ 117055 VMQ silicone rubbers are highly polymeric vinyl-methyl- polysiloxanes. Silicone is quite widespread as a material in butterfly valve seals. Due to its low volumetric expansion under the influence of media and its high elasticity, the butterfly valve switches reliably until the end of its service life. Another argument for VMQ in contact with food and phar- maceuticals is its purity, clearly visible in the transparency of the material, even if the mechanical strength and chem- ical resistance are not optimal, especially during intense cleaning operations. General properties • Excellent thermal and heat resistance • Best low-temperature flexibility • Little temperature dependency of the technological properties • Excellent weathering, aging and ozone resistance • High gas permeability • Very good physiological properties • Very good dielectric properties • Good resistance to synthetic, animal and vegetable oils, glycols, fire-resistant hydraulic fluids and various solvents • Not resistant in low-molecular esters and ethers, aliphatic and aromatic hydrocarbons • Temperature-resistant from –60 °C to +200 °C (–76 °F to +392 °F) 70 VMQ 117055, 76 VMQ 176643 and 78 VMQ 166898 Application profile VMQ as a silicone rubber has very good applicability in an- imal and vegetable fats, oils and waxes and essential oils. Moreover, the material also allows application in high tem- perature ranges. VMQ also has good properties in the ap- plication of CIP/SIP media for continuous operation plants in the food and pharmaceutical industries, with the excep- tion of steam sterilization. VMQ should not be used in con- centrated acids (e.g. nitric acid, formic acid), concentrated oxidizing media (e.g. peracetic acid) or in water and steam above +100 °C (+212 °F), esters and ethers and aromatic hydrocarbons. Furthermore, it should be noted that VMQ does not swell, but loses hardness and tensile strength un- der the influence of the wrong media. VMQ RULES AND STANDARDS 70 VMQ 117055 76 VMQ 176643 78 VMQ 166898 FDA-compliant (CFR 21 Part 177.2600) + + + EU Reg. 1935/2004 EU Reg. 2023/2006 + + + 3-A® Sanitary Standards Class I + USP Ch. 87 (in vitro) USP Ch. 88 (in vivo), Class VI – 121 °C (250 °F) + + Download Data sheet 70 VMQ 117055 Download Data sheet 76 VMQ 176643 Download Data sheet 78 VMQ 166898 Elastomeric materials 36

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