568-390 GREEN HNBR (HSN) 70 ORINGS

APG stocks the HS70390, an AS568-390 green HNBR (Hydrogenated Nitrile) 70 Shore A O-Ring built to an inside diameter of 20.953 in (532.21 mm), a cross section of 0.21 in (5.33 mm), and an outside diameter of 21.373 in (542.87 mm). An o-ring delivers dependable bidirectional sealing in a compact groove envelope.

It resists modern refrigerants, ozone and weathering, and sour gas and amine inhibitors. That behavior comes from the compound itself: HNBR (Hydrogenated Nitrile) is valued for strong resistance to rapid gas decompression and the oil resistance of nitrile with substantially better heat capability. Service temperature is rated from -40°F (-40°C) through 325°F (162.8°C). Exposure to chlorinated hydrocarbons or esters will shorten service life.

Common environments for this compound include engine timing systems, automotive air conditioning, and heavy-duty powertrain.

Order part number HS70390, sold individually. Check the compound against your process media, pressure and temperature before committing to a design.