49 CFR 172 Special Provision 21 (Numeric Codes)

These provisions are multi-modal and apply to bulk and non-bulk packagings.
Code21
DescriptionThis material must be stabilized by appropriate means (e.g., addition of chemical inhibitor, purging to remove oxygen) to prevent dangerous polymerization (see §173.21(f) of this subchapter).
HazMat with this Code


Back - Show all Numeric Codes