-339 BLACK EPDM 70D O-RING

Part number E70339 is an AS568-339 black EPDM (EPR) 70 Shore A O-Ring built to an inside diameter of 3.225 in (81.92 mm), a cross section of 0.21 in (5.33 mm), and an outside diameter of 3.645 in (92.58 mm). An o-ring seats in a machined groove and forms a leak-tight barrier when compressed between two mating surfaces.

Expect good resistance to dilute acids and alkalis, brake fluid, and phosphate ester hydraulic fluids. That behavior comes from the compound itself: EPDM (EPR) is specified for very good flexibility at low temperature and good electrical insulating characteristics. Continuous operating temperature is published at -65°F (-53.9°C) to 300°F (148.9°C). Exposure to mineral oil-based lubricants or aromatic hydrocarbons will shorten service life.

Maintenance and OEM teams specify it across water and steam systems, outdoor equipment, and solar and roofing assemblies.

Reference part number E70339 when ordering; the item is sold individually. Unit weight is approximately 6.977 g and nominal inside diameter is listed as 3 1/4 inch. Application requirements vary, so validate compatibility with your process conditions prior to installation. APG can cross-reference from an existing part number, a drawing or a physical sample if this size is not an exact match.