HazMat Tool — substance information

Acetylene, dissolved

HMT 15 June 2026

UN / ID: UN 1001
Hazard class: 2.1
Packing group: —
ERG guide: ERG 116
Special provisions: SP N86, SP N88
Source: 49 CFR §172 (15 June 2026)

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Acetylene, dissolved

Acetylene (systematic name: ethyne) is a chemical compound with the formula C2H2 and structure HC≡CH. It is a hydrocarbon and the simplest alkyne. This colorless gas is widely used as a fuel and a chemical building block. It is unstable in its pure form and thus is usually handled as a solution Wikipedia

Substance Data

Source: PubChem (HSDB, 30.11.2019)

CAS-Number

74-86-2

Flash Point

n/a

Boiling Point

n/a

Emergency Response Guide No. 116

Hazardous Materials Table

Source: 49 CFR §172 (15 June 2026)

(3) Hazard Class

2.1
Flammable gases

(4) Identification number

UN 1001

(5) Packing Group

n/a

(6) Labels

Cargo Aircraft Only (Cargo Aircraft Only)

(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.

N86	UN pressure receptacles made of aluminum alloy are not authorized. Browse special provision N86
N88	Any metal part of a UN pressure receptacle in contact with the contents may not contain more than 65% copper, with a tolerance of 1%. Browse special provision N88

(8) Packing Authorizations (§173.***)

(8A) Exceptions	None
(8B) Non-bulk	303	see 49 CFR §173.303
(8C) Bulk	None

(9) Quantity Limits

(9A) Passenger aircraft/rail	Forbidden
(9B) Cargo aircraft only	15 kg

(10) Vessel stowage

(10A) Location

Stowage category “D” means the material must be stowed “on deck only” on a cargo vessel or on a passenger vessel carrying a number of passengers limited to not more than the larger of 25 passengers or one passenger per each 3 m of overall vessel length, but the material is prohibited on a passenger vessel in which the limiting number of passengers is exceeded.

Source: 49 CFR §172.101(k)

(10B) Other

25	see 49 CFR §176.84
40	see 49 CFR §176.84
57	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.

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 3138	Ethylene, acetylene and propylene in mixture, refrigerated liquid with at least 71.5 percent ethylene with not more than 22.5 percent acetylene and not more than 6 percent propylene	2.1
UN 1060	Methyl acetylene and propadiene mixtures, stabilized	2.1
	Acetylene silver nitrate	Forbidden
	Acetylene (liquefied)	Forbidden
	Acetylene, solvent free	Forbidden
UN 2452	Ethylacetylene, stabilized	2.1
	Dibromoacetylene	Forbidden
	Dichloroacetylene	Forbidden
	Diiodoacetylene	Forbidden
	Propadiene mixed with methyl acetylene, see Methyl acetylene and propadiene mixtures, stabilized