HazMat Tool — substance information

Elevated temperature liquid, n.o.s., at or above 100 C and below its flash point (including molten metals, molten salts, etc.)

HMT May 2026

UN / ID: UN 3257
Hazard class: 9
Packing group: III
ERG guide: ERG 128
Special provisions: SP IB1, SP T3, SP TP3, SP TP29
Source: 49 CFR §172 (2026/05)

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Elevated temperature liquid, n.o.s., at or above 100 C and below its flash point (including molten metals, molten salts, etc.)

Emergency Response Guide No. 128

Hazardous Materials Table

Source: 49 CFR §172 (2026/05)

(3) Hazard Class

9
Miscellaneous hazardous materials

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, 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

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

85	see 49 CFR §176.84

Source: 49 CFR §176.84

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.

No compatibility information for class 9 in 49 CFR §177.848 included.

Scope & sources (important)Click to show CFR references

This check evaluates segregation per 49 CFR §177.848. Additional loading/unloading and handling requirements may still apply; see 49 CFR §177 Subpart B (Loading and Unloading):

§177.834 - General requirements
§177.835 - Class 1 materials
§177.837 - Class 3 materials
§177.838 - Class 4 (flammable solid) materials, Class 5 (oxidizing) materials, and Division 4.2 (pyroforic liquid) materials
§177.839 - Class 8 (corrosive) materials
§177.840 - Class 2 (gases) materials
§177.841 - Division 6.1 and Division 2.3 materials
§177.842 - Class 7 (radioactive) material
§177.843 - Contamination of vehicles

Similar substances

UN / ID	Proper shipping name	Hazard class
UN 3256	Elevated temperature liquid, flammable, n.o.s., with flash point above 37.8 C, at or above its flash point	3
UN 3111	Organic peroxide type B, liquid, temperature controlled	5.2
UN 3113	Organic peroxide type C, 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 3233	Self-reactive liquid type C, 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 3114	Organic peroxide type C, 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