HazMat Tool — substance information

Elevated temperature liquid, flammable, n.o.s., with flash point above 37.8 C, at or above its flash point

HMT 15 June 2026

UN / ID: UN 3256
Hazard class: 3
Packing group: III
ERG guide: ERG 128
Special provisions: SP IB1, SP T3, SP TP3, SP TP29
Source: 49 CFR §172 (15 June 2026)

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Elevated temperature liquid, flammable, n.o.s., with flash point above 37.8 C, at or above its flash point

Emergency Response Guide No. 128

Hazardous Materials Table

Source: 49 CFR §172 (15 June 2026)

(3) Hazard Class

3
Flammable liquids

This entry is signed with "G". The letter "G" identifies proper shipping names for which one or more technical names of the hazardous material must be entered in parentheses, in association with the basic description. (See §172.203(k)).

(7) Special Provisions (§172.102)

×Note:
Special provisions may be very complex. The extracts are taken from 49 CFR §172.102. Please be careful with the information, as necessary, additional conditions may be applied that are not written here. Please check the original source and report bugs.

IB1

_{Authorized IBCs:} Metal (31A, 31B and 31N).
_{Additional Requirement:} Only liquids with a vapor pressure less than or equal to 110 kPa at 50 °C (1.1 bar at 122 °F), or 130 kPa at 55 °C (1.3 bar at 131 °F) are authorized.

Browse special provision IB1

Minimum test pressure (bar)	2.65
Minimum shell thickness	§ 178.274(d)(2)
Pressure-relief requirements	Normal
Bottom opening requirements	§ 178.275(d)(2)

Browse special provision T3

TP3

The maximum degree of filling (in %) for solids transported above their melting points and for elevated temperature liquids shall be determined by the following:
TP3

Where: d_f and d_r are the mean densities of the liquid at the mean temperature of the liquid during filling and the maximum mean bulk temperature during transport respectively.

Browse special provision TP3

TP29

A portable tank having a minimum test pressure of 1.5 bar (150.0 kPa) may be used provided the calculated test pressure is 1.5 bar or less based on the MAWP of the hazardous materials, as defined in § 178.275 of this subchapter, where the test pressure is 1.5 times the MAWP.

Browse special provision TP29

(8) Packing Authorizations (§173.***)

(8A) Exceptions	None
(8B) Non-bulk	None
(8C) Bulk	247	see 49 CFR §173.247

(9) Quantity Limits

(9A) Passenger aircraft/rail	Forbidden
(9B) Cargo aircraft only	Forbidden

(10) Vessel stowage

(10A) Location	A Stowage category “A” means the material may be stowed “on deck” or “under deck” on a cargo vessel or on a passenger vessel. Source: 49 CFR §172.101(k)
(10B) Other	n/a

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 3257	Elevated temperature liquid, n.o.s., at or above 100 C and below its flash point (including molten metals, molten salts, etc.)	9
UN 3111	Organic peroxide type B, liquid, temperature controlled	5.2
UN 3115	Organic peroxide type D, liquid, temperature controlled	5.2
UN 3117	Organic peroxide type E, liquid, temperature controlled	5.2
UN 3119	Organic peroxide type F, liquid, temperature controlled	5.2
UN 3231	Self-reactive liquid type B, temperature controlled	4.1
UN 3235	Self-reactive liquid type D, temperature controlled	4.1
UN 3237	Self-reactive liquid type E, temperature controlled	4.1
UN 3239	Self-reactive liquid type F, temperature controlled	4.1
UN 3112	Organic peroxide type B, solid, temperature controlled	5.2
UN 3116	Organic peroxide type D, solid, temperature controlled	5.2
UN 3118	Organic peroxide type E, solid, temperature controlled	5.2
UN 3120	Organic peroxide type F, solid, temperature controlled	5.2
UN 3113	Organic peroxide type C, liquid, temperature controlled	5.2
UN 3534	Polymerizing substance, liquid, temperature controlled, n.o.s.	4.1