HazMat Tool — substance information

Copper acetylide

HMT 15 June 2026

UN / ID: n/a
Hazard class: Forbidden
Packing group: —
ERG guide: —
Special provisions: —
Source: 49 CFR §172 (15 June 2026)

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Copper acetylide

Copper(I) acetylide, copper carbide or cuprous acetylide, is claimed to be a chemical compound with the formula Cu2C2. It is proposed to consists of Cu+ cations and acetylide anions −C≡C−, with the triple bond between the two carbon atoms. Although never characterized by X-ray crystallography, the material has been claimed at least since 1856. One form is claimed to be a monohydrate with formula Cu2C2·H2O Wikipedia

Hazardous Materials Table

Source: 49 CFR §172 (15 June 2026)

(3) Hazard Class

Forbidden

(4) Identification number

n/a

(5) Packing Group

n/a

(6) Labels

n/a

(7) Special Provisions (§172.102)

(8) Packing Authorizations (§173.***)

(8A) Exceptions	n/a	see 49 CFR §173. n/a
(8B) Non-bulk	n/a	see 49 CFR §173. n/a
(8C) Bulk	n/a	see 49 CFR §173. n/a

(9) Quantity Limits

(9A) Passenger aircraft/rail	n/a
(9B) Cargo aircraft only	n/a

(10) Vessel stowage

(10A) Location	n/a see
(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.

This Hazmat is classified as "Forbidden". This means the material may not be offered for transportation or transported in the applicable mode of transport.

Similar substances

UN / ID	Proper shipping name	Hazard class
	Silver acetylide (dry)	Forbidden
	Mercury acetylide	Forbidden