5-Mercaptotetrazol-1-acetic acid
HMT May 2026- UN / ID
- UN 0448
- Hazard class
- 1.4C
- Packing group
- n/a (multiple — see tabs)
- ERG guide
- —
- Special provisions
- —
- Source
- 49 CFR §172 (2026/05)
5-Mercaptotetrazol-1-acetic acid
Hazardous Materials Table
Source: 49 CFR §172 (2026/05)(3) Hazard Class1.4Explosives |
(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.***)
|
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| (8A) Exceptions | None | |
|---|---|---|
| (8B) Non-bulk | 62 | see 49 CFR §173.62 |
| (8C) Bulk | None |
(9) Quantity Limits 
| (9A) Passenger aircraft/rail | Forbidden |
|---|---|
| (9B) Cargo aircraft only | 75 kg |
(10) Vessel stowage 
| (10A) Location | |
|---|---|
| (10B) Other |
(3) Hazard Class1.4Explosives |
(4) Identification number |
(5) Packing Group |
|||||||
(6) Labels |
|||||||||
(1) Symbols |
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| 101 |
|---|
(8) Packing Authorizations (§173.***) 
| (8A) Exceptions | None | |
|---|---|---|
| (8B) Non-bulk | 62 | see 49 CFR §173.62 |
| (8C) Bulk | None |
(9) Quantity Limits 
| (9A) Passenger aircraft/rail | Forbidden |
|---|---|
| (9B) Cargo aircraft only | 75 kg |
(10) Vessel stowage 
| (10A) Location | |
|---|---|
| (10B) Other |
(3) Hazard Class1.4Explosives |
(4) Identification number |
(5) Packing Group |
|||||||
(6) Labels |
|||||||||
(7) Special Provisions (§172.102)
|
|||||||||
(8) Packing Authorizations (§173.***)
|
|||||||||
| (8A) Exceptions | None | |
|---|---|---|
| (8B) Non-bulk | 62 | see 49 CFR §173.62 |
| (8C) Bulk | None |
(9) Quantity Limits 
| (9A) Passenger aircraft/rail | Forbidden |
|---|---|
| (9B) Cargo aircraft only | 75 kg |
(10) Vessel stowage 
| (10A) Location | |
|---|---|
| (10B) Other |
(3) Hazard Class1.4Explosives |
(4) Identification number |
(5) Packing Group |
|||||||
(6) Labels |
|||||||||
(7) Special Provisions (§172.102)
|
|||||||||
(8) Packing Authorizations (§173.***)
|
|||||||||
| (8A) Exceptions | None | |
|---|---|---|
| (8B) Non-bulk | 62 | see 49 CFR §173.62 |
| (8C) Bulk | None |
(9) Quantity Limits 
| (9A) Passenger aircraft/rail | Forbidden |
|---|---|
| (9B) Cargo aircraft only | 75 kg |
(10) Vessel stowage 
| (10A) Location | |
|---|---|
| (10B) Other |
(3) Hazard Class1.4Explosives |
(4) Identification number |
(5) Packing Group |
||||||||
(6) Labels |
||||||||||
(7) Special Provisions (§172.102)
|
||||||||||
(8) Packing Authorizations (§173.***)
|
||||||||||
| (8A) Exceptions | None | |
|---|---|---|
| (8B) Non-bulk | 62 | see 49 CFR §173.62 |
| (8C) Bulk | 62 | see 49 CFR §173.62 |
(9) Quantity Limits 
| (9A) Passenger aircraft/rail | Forbidden |
|---|---|
| (9B) Cargo aircraft only | 75 kg |
(10) Vessel stowage 
| (10A) Location | |
|---|---|
| (10B) Other |
(3) Hazard Class1.4Explosives |
(4) Identification number |
(5) Packing Group |
||||||||
(6) Labels |
||||||||||
(7) Special Provisions (§172.102)
|
||||||||||
| 110 |
|---|
(8) Packing Authorizations (§173.***) 
| (8A) Exceptions | None | |
|---|---|---|
| (8B) Non-bulk | 62 | see 49 CFR §173.62 |
| (8C) Bulk | 62 | see 49 CFR §173.62 |
(9) Quantity Limits 
| (9A) Passenger aircraft/rail | Forbidden |
|---|---|
| (9B) Cargo aircraft only | 75 kg |
(10) Vessel stowage 
| (10A) Location | |
|---|---|
| (10B) Other |
(3) Hazard Class1.4Explosives |
(4) Identification number |
(5) Packing Group |
|||||||
(6) Labels |
|||||||||
(7) Special Provisions (§172.102)
|
|||||||||
| 50 |
|---|
(8) Packing Authorizations (§173.***) 
| (8A) Exceptions | None | |
|---|---|---|
| (8B) Non-bulk | 62 | see 49 CFR §173.62 |
| (8C) Bulk | None |
(9) Quantity Limits 
| (9A) Passenger aircraft/rail | Forbidden |
|---|---|
| (9B) Cargo aircraft only | 75 kg |
(10) Vessel stowage 
| (10A) Location | |
|---|---|
| (10B) Other |
(3) Hazard Class1.4Explosives |
(4) Identification number |
(5) Packing Group |
|||||||
(6) Labels |
|||||||||
(7) Special Provisions (§172.102)
|
|||||||||
(8) Packing Authorizations (§173.***)
|
|||||||||
| (8A) Exceptions | None | |
|---|---|---|
| (8B) Non-bulk | 62 | see 49 CFR §173.62 |
| (8C) Bulk | None |
(9) Quantity Limits 
| (9A) Passenger aircraft/rail | Forbidden |
|---|---|
| (9B) Cargo aircraft only | 75 kg |
(10) Vessel stowage 
| (10A) Location | |
|---|---|
| (10B) Other |
(3) Hazard Class1.4Explosives |
(4) Identification number |
(5) Packing Group |
|||||||
(6) Labels |
|||||||||
(7) Special Provisions (§172.102)
|
|||||||||
(8) Packing Authorizations (§173.***)
|
|||||||||
| (8A) Exceptions | None | |
|---|---|---|
| (8B) Non-bulk | 62 | see 49 CFR §173.62 |
| (8C) Bulk | None |
(9) Quantity Limits 
| (9A) Passenger aircraft/rail | Forbidden |
|---|---|
| (9B) Cargo aircraft only | 75 kg |
(10) Vessel stowage 
| (10A) Location | |
|---|---|
| (10B) Other |
(3) Hazard Class1.4Explosives |
(4) Identification number |
(5) Packing Group |
|||||||
(6) Labels |
|||||||||
(1) Symbols |
|||||||||
| 51 |
|---|
(8) Packing Authorizations (§173.***) 
| (8A) Exceptions | None | |
|---|---|---|
| (8B) Non-bulk | 62 | see 49 CFR §173.62 |
| (8C) Bulk | None |
(9) Quantity Limits 
| (9A) Passenger aircraft/rail | Forbidden |
|---|---|
| (9B) Cargo aircraft only | 75 kg |
(10) Vessel stowage 
| (10A) Location | |
|---|---|
| (10B) Other |
(3) Hazard Class1.4Explosives |
(4) Identification number |
(5) Packing Group |
||||||||
(6) Labels |
||||||||||
(7) Special Provisions (§172.102)
|
||||||||||
| 16 |
|---|
(8) Packing Authorizations (§173.***) 
| (8A) Exceptions | 171 | see 49 CFR §173.171 |
|---|---|---|
| (8B) Non-bulk | 62 | see 49 CFR §173.62 |
| (8C) Bulk | None |
(9) Quantity Limits 
| (9A) Passenger aircraft/rail | Forbidden |
|---|---|
| (9B) Cargo aircraft only | 75 kg |
(10) Vessel stowage 
| (10A) Location | |
|---|---|
| (10B) Other |
(3) Hazard Class1.4Explosives |
(4) Identification number |
(5) Packing Group |
||||||||
(6) Labels |
||||||||||
(7) Special Provisions (§172.102)
|
||||||||||
| 109 |
|---|
(8) Packing Authorizations (§173.***) 
| (8A) Exceptions | None | |
|---|---|---|
| (8B) Non-bulk | 62 | see 49 CFR §173.62 |
| (8C) Bulk | 62 | see 49 CFR §173.62 |
(9) Quantity Limits 
| (9A) Passenger aircraft/rail | Forbidden |
|---|---|
| (9B) Cargo aircraft only | 75 kg |
(10) Vessel stowage 
| (10A) Location | |
|---|---|
| (10B) Other |
(3) Hazard Class1.4Explosives |
(4) Identification number |
(5) Packing Group |
||||||||
(6) Labels |
||||||||||
(7) Special Provisions (§172.102)
|
||||||||||
(8) Packing Authorizations (§173.***)
|
||||||||||
| (8A) Exceptions | None | |
|---|---|---|
| (8B) Non-bulk | 62 | see 49 CFR §173.62 |
| (8C) Bulk | 62 | see 49 CFR §173.62 |
(9) Quantity Limits 
| (9A) Passenger aircraft/rail | Forbidden |
|---|---|
| (9B) Cargo aircraft only | 75 kg |
(10) Vessel stowage 
| (10A) Location | |
|---|---|
| (10B) Other |
(3) Hazard Class1.4Explosives |
(4) Identification number |
(5) Packing Group |
|||||||
(6) Labels |
|||||||||
(1) Symbols |
|||||||||
| 101 |
|---|
(8) Packing Authorizations (§173.***) 
| (8A) Exceptions | None | |
|---|---|---|
| (8B) Non-bulk | 62 | see 49 CFR §173.62 |
| (8C) Bulk | None |
(9) Quantity Limits 
| (9A) Passenger aircraft/rail | Forbidden |
|---|---|
| (9B) Cargo aircraft only | 75 kg |
(10) Vessel stowage 
| (10A) Location | |
|---|---|
| (10B) Other |
(3) Hazard Class1.4Explosives |
(4) Identification number |
(5) Packing Group |
|||||||
(6) Labels |
|||||||||
(7) Special Provisions (§172.102)
|
|||||||||
(8) Packing Authorizations (§173.***)
|
|||||||||
| (8A) Exceptions | None | |
|---|---|---|
| (8B) Non-bulk | 62 | see 49 CFR §173.62 |
| (8C) Bulk | None |
(9) Quantity Limits 
| (9A) Passenger aircraft/rail | Forbidden |
|---|---|
| (9B) Cargo aircraft only | 75 kg |
(10) Vessel stowage 
| (10A) Location | |
|---|---|
| (10B) Other |
(3) Hazard Class1.4Explosives |
(4) Identification number |
(5) Packing Group |
|||||||
(6) Labels |
|||||||||
(7) Special Provisions (§172.102)
|
|||||||||
(8) Packing Authorizations (§173.***)
|
|||||||||
| (8A) Exceptions | None | |
|---|---|---|
| (8B) Non-bulk | 62 | see 49 CFR §173.62 |
| (8C) Bulk | None |
(9) Quantity Limits 
| (9A) Passenger aircraft/rail | Forbidden |
|---|---|
| (9B) Cargo aircraft only | 75 kg |
(10) Vessel stowage 
| (10A) Location | |
|---|---|
| (10B) Other |
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.
| PG n/a | PG n/a | PG n/a | PG n/a | PG n/a | PG n/a | PG n/a | PG n/a | PG n/a | PG n/a | PG n/a | PG n/a | PG n/a | PG n/a | PG n/a | PG n/a | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 1 | G | D | G | |||||||||||||
| 2 | 5-Mercaptotetrazol-1-acetic acid | Articles, explosive, n.o.s. | Cartridges for weapons, blank or Cartridges, small arms, blank | Cartridges for weapons, inert projectile or Cartridges, small arms | Cartridges, oil well | Cartridges, power device | Cases, cartridges, empty with primer | Cases, combustible, empty, without primer | Charges, propelling | Model rocket motor | Powder, smokeless | Rocket motors | Rockets, with expelling charge | Substances, explosive, n.o.s. | Tetrazol-1-acetic acid | Propellant, solid |
| 3 | 1.4C | 1.4C | 1.4C | 1.4C | 1.4C | 1.4C | 1.4C | 1.4C | 1.4C | 1.4C | 1.4C | 1.4C | 1.4C | 1.4C | 1.4C | 1.4C |
| 4 | UN 0448 | UN 0351 | UN 0338 | UN 0339 | UN 0278 | UN 0276 | UN 0379 | UN 0446 | UN 0491 | NA 0276 | UN 0509 | UN 0510 | UN 0438 | UN 0479 | UN 0407 | UN 0501 |
| 5 | n/a | n/a | n/a | n/a | n/a | n/a | n/a | n/a | n/a | n/a | n/a | n/a | n/a | n/a | n/a | n/a |
| 6 | 1.4C | 1.4C | 1.4C | 1.4C | 1.4C | 1.4C | 1.4C | 1.4C | 1.4C | 1.4C | 1.4C | 1.4C | 1.4C | 1.4C | 1.4C | 1.4C |
| 7 | n/a | 101 | n/a | n/a | n/a | 110 | 50 | n/a | n/a | 51 | 16 | 109 | n/a | 101 | n/a | n/a |
| 8A | None | None | None | None | None | None | None | None | None | None | 171 | None | None | None | None | None |
| 8B | 62 | 62 | 62 | 62 | 62 | 62 | 62 | 62 | 62 | 62 | 62 | 62 | 62 | 62 | 62 | 62 |
| 8C | None | None | None | None | 62 | 62 | None | None | None | None | None | 62 | 62 | None | None | None |
| 9A | Forbidden | Forbidden | Forbidden | Forbidden | Forbidden | Forbidden | Forbidden | Forbidden | Forbidden | Forbidden | Forbidden | Forbidden | Forbidden | Forbidden | Forbidden | Forbidden |
| 9B | 75 kg | 75 kg | 75 kg | 75 kg | 75 kg | 75 kg | 75 kg | 75 kg | 75 kg | 75 kg | 75 kg | 75 kg | 75 kg | 75 kg | 75 kg | 75 kg |
| 10A | 02 | 02 | 02 | 02 | 02 | 02 | 02 | 02 | 02 | 02 | 02 | 02 | 02 | 02 | 02 | 02 |
| 10B | 25 | 25 | 25 | 25 | 25 | 25 | 25 | 25 | 25 | 25 | 25 | 25 | 25 | 25 | 25 | 25 |
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![]() |
1.1/1.2 ![]() | ||||||||||||||||||
1.3 ![]() | ||||||||||||||||||
1.4 ![]() | ||||||||||||||||||
1.5 ![]() | ||||||||||||||||||
1.6 ![]() | ||||||||||||||||||
2.1 ![]() | ||||||||||||||||||
2.2 ![]() | ||||||||||||||||||
2.3A ![]() | ||||||||||||||||||
2.3B ![]() | ||||||||||||||||||
3 ![]() | ||||||||||||||||||
4.1 ![]() | ||||||||||||||||||
4.2 ![]() | ||||||||||||||||||
4.3 ![]() | ||||||||||||||||||
5.1 ![]() | ||||||||||||||||||
5.2 ![]() | ||||||||||||||||||
6.1 ![]() | ||||||||||||||||||
7 ![]() | ||||||||||||||||||
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. |
Similar substances
| UN / ID | Proper shipping name | Hazard class |
|---|---|---|
| UN 0495 | Propellant, liquid | 1.3C |
| UN 0497 | Propellant, liquid | 1.1C |