HazMat Tool — substance information
Reference only — not a shipping paper, placard mandate, or CVI record.
Methazoic acid
HMT 15 June 2026- UN / ID
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- Hazard class
- Forbidden
- Packing group
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- ERG guide
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- Special provisions
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- Source
- 49 CFR §172 (15 June 2026)
Methazoic acid
Metrizoic acid is a pharmaceutical drug that was used as an iodinated contrast medium for X-ray imaging. Its uses included angiography (imaging of blood vessels and heart chambers) and urography (imaging of the urinary tract), but its approval for use has been discontinued in the United States by the FDA. It was used in form of its salts, metrizoates. Due to its high osmolality, metrizoic acid had a risk of inducing allergic reactions higher than that of lower osmolar contrast media Wikipedia
Hazardous Materials Table
Source: 49 CFR §172 (15 June 2026)(3) Hazard classForbidden |
(4) Identification number |
(5) Packing Group |
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(6) Labels — |
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(7) Special Provisions (§172.102)
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(8) Packing Authorizations (§173.***) 
| (8A) Exceptions | — |
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| (8B) Non-bulk | — |
| (8C) Bulk | — |
(9) Quantity Limits
| (9A) Passenger aircraft/rail | — |
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| (9B) Cargo aircraft only | — |
(10) Vessel stowage
| (10A) Location | — |
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| (10B) Other | — |
Segregation chart for load, transport, and storage
This chart shows whether loading, transport, or storage with other hazard classes is permitted, prohibited, or restricted. Based on 49 CFR §177.848.
This Hazmat is classified as "Forbidden". This means the material may not be offered for transportation or transported in the applicable mode of transport.