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EPDM is acceptable for temperature applications between -70 degrees F (-57 degrees C) to 300 degrees F (149 degrees C). It is compatible for use with water and steam, silicone oil and grease, polar solvents (alcohols), acids, glycol-based brake fluids, ozone, and weathering. It is vulnerable to many oils, gasoline, and solvents. This material meets ASTM International standards.
This EPDM O-ring has a shore durometer of 70A. Shore durometer is the hardness of a material, and its resistance to permanent indentation. A higher durometer value indicates greater resistance to indentation on a scale of 0 to 100, with 100 indicating no indentation.
O-rings commonly provide a pressure and fluid seal between cylindrically shaped, overlapping mating surfaces and are commonly seen in engines, faucets, flanges, valves, and various cylinders. They are circular in shape, with a round cross section and a hole in the center, similar to a doughnut. O-rings are available in various sizes, and can be ordered based on required nominal inside diameter (ID), outer diameter (OD), and cross-sectional (CS) diameter.This EPDM O-ring meets standards defined by Aerospace Standard AS568A, which is the Aerospace Size Standard for Rubber O-Ring./window-frame.
Douglas Reed, a purchaser from the NY USA said:
"Item arrived on-time and in good condition in a sealed plastic bag. Labeling on the bag included general item description (EPDM O-ring black -228), part count and part and stock-keeping numbers, but omitted the size specifications. There was no obvious damage or defects and the part count was correct.
The rubber seem to be of good quality and is firm, smooth and dry, with a light residue of release-agent powder (this is acceptable). It should be noted that the cross-sections of the O-rings are not perfectly round; there is a very slight lip on the inner- and outer-most diameters. This is no doubt where the dies met for the molding process, and is unlikely to interfere with performance. Measurement of about half a dozen or so pieces revealed all actual dimensions (which differ from the nominal dimensions--I highly recommend consulting the "Product Details" section) to be within specified tolerances.
All-in-all, these seem to be fine quality O-rings, though not quite top-of-the-line. Still, for the price I paid at the time, they were an OUTSTANDING value. Recommended."