49 CFR 172 Special Provision B56 (B-Codes)
These provisions apply only to bulk packagings. Except as otherwise provided in this subchapter, these special provisions do not apply to UN portable tanks or IBCs.
| Code | B56 |
|---|---|
| Description | Water-tight, sift-proof, closed-top, metal-covered hopper cars are also authorized if the particle size of the hazardous material is not less than 149 microns. |
| HazMat with this Code |