Proof Rings

Cortest proof rings were first commercially available in 1977 as our original product to meet the testing requirements of NACE TM 0177 test method which is used to determine materials that meet the NACE material requirement of MR 0175. The proof ring test system is the most widely used method for evaluating sulfide stress corrosion behavior of materials. Its compact size, accuracy, and ease of use provide an economical means for testing multiple specimens simultaneously in a fume hood. Proof rings are precision machined from a single piece of proprietary alloy steel, and are then individually tested to obtain the relationship between load and ring deflection. Each ring is supplied with a unique test report, and are accurate to within 1% at full load.