HazMat Tool — substance information
Reference only — not a shipping paper, placard mandate, or CVI record.
Isopropyl isobutyrate
HMT 15 June 2026- UN / ID
- UN 2406
- Hazard class
- 3
- Packing group
- II
- ERG guide
- ERG 127
- Special provisions
- SP IB2, SP T4, SP TP1
- Source
- 49 CFR §172 (15 June 2026)
Isopropyl isobutyrate
In organic chemistry, a propyl group is a three-carbon alkyl substituent with chemical formula −CH2CH2CH3 for the linear form. This substituent form is obtained by removing one hydrogen atom attached to the terminal carbon of propane. A propyl substituent is often represented in organic chemistry with the symbol Pr (not to be confused with the element praseodymium). An isomeric form of propyl is obtained by moving the point of attachment from a terminal carbon atom to the central carbon atom, named isopropyl or 1-methylethyl Wikipedia
| Emergency Response Guide No. 127 |
Hazardous Materials Table
Source: 49 CFR §172 (15 June 2026)(3) Hazard class3Flammable liquids |
(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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| IB2 | |
|---|---|
| T4 | |
| TP1 |
(8) Packing Authorizations (§173.***) 
| (8A) Exceptions | 150 | see 49 CFR §173.150 |
|---|---|---|
| (8B) Non-bulk | 202 | see 49 CFR §173.202 |
| (8C) Bulk | 242 | see 49 CFR §173.242 |
(9) Quantity Limits 
| (9A) Passenger aircraft/rail | 5 L |
|---|---|
| (9B) Cargo aircraft only | 60 L |
(10) Vessel stowage 
| (10A) Location | |
|---|---|
| (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.
| 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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3 ![]() | ||||||||||||||||||
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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 |
|---|---|---|
| tert-Butyl peroxyisobutyrate, with more than 77 percent in solution | Forbidden | |
| UN 2045 | Isobutyraldehyde or Isobutyl aldehyde | 3 |
| UN 2385 | Ethyl isobutyrate | 3 |
| UN 2528 | Isobutyl isobutyrate | 3 |
