Ask X3What does 49 CFR 173.136 (Class 8—Definitions) require?
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Based on 49 CFR 173.136, a "corrosive material" (Class 8) is defined as:
* A liquid or solid that causes irreversible damage to human skin at the site of contact within a specified period of time.
* A liquid, or a solid that may become liquid during transport, that has a severe corrosion rate on steel or aluminum based on the criteria in § 173.137(c)(2).
To determine if a material is corrosive, you should use authorized *in vitro* test methods or historical data whenever practical. Furthermore, skin corrosion test data produced by September 30, 1995, using the specific older procedures outlined in the regulation, may still be used for classification and packing group assignment. If human experience or other data shows the hazard is different than test results indicate, PHMSA may revise the classification or determine the material is not subject to the subchapter requirements.