568-218 FLUOROSILICONE 70 DURO ORINGS

This o-ring is supplied in AS568-218 blue Fluorosilicone (FVMQ) 70 Shore A built to an inside diameter of 1.234 in (31.34 mm), a cross section of 0.139 in (3.53 mm), and an outside diameter of 1.512 in (38.4 mm), catalogued under part number FS70218. It compresses into its gland to block fluid or gas migration across a joint.

Fluorosilicone (FVMQ) is specified here for standard choice for static aerospace fuel system seals and silicone's low-temperature flexibility combined with fuel resistance. Expect good resistance to ozone and weathering, extreme cold, and aromatic fuels and jet fuel. Rated temperature range runs from -80°F (-62.2°C) to 350°F (176.7°C) in continuous service. Applications involving hydrazine or ketones call for a different compound.

It sees regular use in military ground vehicles, aviation fuel systems, and high-altitude equipment.

Order part number FS70218, sold individually. Unit weight is approximately 1.5351 g and nominal inside diameter is listed as 1 1/4 inch. As always, verify media compatibility and operating conditions against the requirements of your specific application. If you need a size, durometer or compound that is not listed, APG can cross-reference from a print, a sample or a competitor part number.