HazMat Tool — substance information
Thiourea dioxide
HMT May 2026Thiourea dioxide
Thiourea dioxide or thiox is an organosulfur compound that is used in the textile industry. It functions as a reducing agent. It is a white solid, and exhibits tautomerism in solution. Wikipedia
| Emergency Response Guide No. 135 |
Hazardous Materials Table
Source: 49 CFR §172 (2026/05)(3) Hazard Class4.2Spontaneously combustible materials |
(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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| IB6 | |
|---|---|
| IP2 | |
| T3 | |
| TP33 | |
| W31 |
(8) Packing Authorizations (§173.***) 
| (8A) Exceptions | None | |
|---|---|---|
| (8B) Non-bulk | 212 | see 49 CFR §173.212 |
| (8C) Bulk | 241 | see 49 CFR §173.241 |
(9) Quantity Limits 
| (9A) Passenger aircraft/rail | 15 kg |
|---|---|
| (9B) Cargo aircraft only | 50 kg |
(10) Vessel stowage 
| (10A) Location | |
|---|---|
| (10B) Other | n/a |
(3) Hazard Class4.2Spontaneously combustible materials |
(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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| IB8 | |
|---|---|
| IP3 | |
| T1 | |
| TP33 | |
| W31 |
(8) Packing Authorizations (§173.***) 
| (8A) Exceptions | None | |
|---|---|---|
| (8B) Non-bulk | 213 | see 49 CFR §173.213 |
| (8C) Bulk | 241 | see 49 CFR §173.241 |
(9) Quantity Limits 
| (9A) Passenger aircraft/rail | 25 kg |
|---|---|
| (9B) Cargo aircraft only | 100 kg |
(10) Vessel stowage 
| (10A) Location | |
|---|---|
| (10B) Other | n/a |
Packing group comparison
Multiple packing groups apply to this entry. See assignment criteria in 49 CFR §173 Subpart D. Details are in the tabs above; differences are highlighted.
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.
| Hazard class | 8![]() | 7![]() | 6.1![]() | 5.2![]() | 5.1![]() | 4.3![]() | 4.2![]() | 4.1![]() | 3![]() | 2.3B![]() | 2.3A![]() | 2.2![]() | 2.1![]() | 1.6![]() | 1.5![]() | 1.4![]() | 1.3![]() | 1.1/1.2![]() |
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8 ![]() |
| Must not be loaded, transported, or stored together in the same vehicle or facility. | |
| May be loaded, transported, or stored together. | |
| May be loaded, transported, or stored together only with restrictions. |