Calcium is a chemical element with the symbol Ca and atomic number 20. As an alkaline earth metal, calcium is a reactive metal that forms a dark oxide-nitride layer when exposed to air. Its physical and chemical properties are most similar to its heavier homologues strontium and barium. It is the fifth most abundant element in Earth's crust, and the third most abundant metal, after iron and aluminium. Wikipedia

Emergency Response Guide No. 138

Data from the Hazardous Materials Table

Source: 49 CFR §172 (2018/07)

(3) Hazard Class

Dangerous when wet materials

(4) Identification number Help

UN 1401

(5) Packing Group Help


(6) Labels Help

Dangerous when wet materials (4.3)

(7) Special Provisions (§172.102) Help

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.

(8) Packing Authorizations (§173.***) Help

(8A) Exceptions151see 49 CFR §173.151
(8B) Non-bulk212see 49 CFR §173.212
(8C) Bulk241see 49 CFR §173.241

(9) Quantity Limits Help

(9A) Passenger aircraft/rail15 kg
(9B) Cargo aircraft only50kg

(10) Vessel stowage Help

(10A) Location
(10B) Other

Segregation Chart for Load, Transport, Storage

In this table a statement is contained for each hazard class whether the loading, transport or storage with other hazard classes is allowed, is not permitted or is restricted. The table is based on U.S.-Code 49 CFR §177.848.

red May not be loaded, transported, or stored together in the same transport vehicle or storage facility.
green Load, transport, storage together is not restricted.
yellow Load, transport, storage together is allowed under restrictions.

Substances with similar name

UN-NumberNameHazard Class
UN 1401Calcium4.3
UN 1855Calcium, pyrophoric or Calcium alloys, pyrophoric4.2
UN 1573Calcium arsenate6.1
UN 1574Calcium arsenate and calcium arsenite, mixtures, solid6.1
Calcium bisulfite solution, see Bisulfites, aqueous solutions, n.o.s.
UN 1402Calcium carbide4.3
UN 1403Calcium cyanamide with more than 0.1 percent of calcium carbide4.3
UN 1923Calcium dithionite or Calcium hydrosulfite4.2
Calcium hydrosulfite, see Calcium dithionite
UN 3485Calcium hypochlorite, dry, corrosive or Calcium hypochlorite mixture, dry, corrosive with more than 39% available chlorine (8.8% available oxygen)5.1
UN 1748Calcium hypochlorite, dry or Calcium hypochlorite mixture dry with more than 39% available chlorine (8.8% available oxygen)5.1
UN 2880Calcium hypochlorite, hydrated or Calcium hypochlorite, hydrated mixture, with not less than 5.5% but not more than 16% water5.1
UN 3486Calcium hypochlorite mixture, dry, corrosive with more than 10% but not more than 39% available chlorine5.1
UN 2208Calcium hypochlorite mixture, dry, with more than 10% but not more than 39% available chlorine5.1
UN 2844Calcium manganese silicon4.3
UN 1910Calcium oxide8
UN 1455Calcium perchlorate5.1
UN 1456Calcium permanganate5.1
UN 1360Calcium phosphide4.3
UN 1314Calcium resinate, fused4.1
UN 2907Isosorbide dinitrate mixture with not less than 60 percent lactose, mannose, starch or calcium hydrogen phosphate4.1
Quicklime, see Calcium oxide