The NACE TM0192 is an RGD test that is designed by the National Association of Corrosion Engineers to be a preliminary material evaluation. It is instead meant to be a relative demonstration of how well a material can perform in RGD damage scenarios. While the NACE TM0192 standard includes a rating system, Alpine typically refers to the ISO 23936-2 procedure. However, the NACE TM0192 rating system is as follows:
The testing process uses the ISO standard fixture. The O-ring is loaded into a gas trap fixture, which allows the gas to contact one side of the seal. The fixture is then put into a vessel that will hold a CO2 pressure of 5.2 MPa at room temperature. The sample is exposed for 24 hours before being decompressed. The O-ring is then examined for damage both internally and externally. Based on what is found, the sample gets assigned a grade between 1 and 4.
The NACE TM0297 standard is like the NACE TM0192, except it uses much higher temperature and pressure conditions. While the NACE TM0297 standard includes a rating system, Alpine typically refers to the ISO 23936-2 procedure. However, the NACE TM0297 rating system is as follows:
The sample is exposed to a CO2 environment at 7-38 MPa and 50-230°C. It is exposed to this pressure for 24 hours before being decompressed. The sample is then inspected internally and externally, and given a grade based on a rating system defined in the standard. The grades range from 1 to 4.