S70MD243 is an AS568-243 red Silicone 70 Shore A O-Ring measuring an inside diameter of 4.109 in (104.37 mm), a cross section of 0.139 in (3.53 mm), and an outside diameter of 4.387 in (111.43 mm). In service, this o-ring compresses into its gland to block fluid or gas migration across a joint.
Silicone is specified here for very good compression set resistance across its range and exceptionally wide service temperature range. The compound resists many oxidizing chemicals, dry heat, and ozone and UV exposure. Rated temperature range runs from -80°F (-62.2°C) to 450°F (232.2°C) in continuous service. It should not be specified for service in hydrocarbon fuels and oils or steam above its rated range.
The compound is metal detectable for HACCP and foreign-body control programs. It sees regular use in ovens and heated equipment, food and beverage processing, and pharmaceutical manufacturing.
Reference part number S70MD243 when ordering; the item is sold individually. Nominal inside diameter is listed as 4 1/8 inch. As always, verify media compatibility and operating conditions against the requirements of your specific application.
Description -243 RED SILICONE 70D O-RING
Actual Cross Section 0.139 inch (3.53 mm)
Actual Inside Diameter 4.109 inch (104.37 mm)
Actual Outside Diameter 4.387 inch (111.43 mm)
Measurement System Imperial
Product Category O-Rings - FDA / Metal Detectable