HazMat Tool — substance information

Phosphorus, amorphous

HMT May 2026
UN / ID
UN 1338
Hazard class
4.1
Packing group
III
ERG guide
ERG 133
Special provisions
SP A1, SP A19, SP B1, SP B9, SP B26, SP IB8, SP IP3, SP T1, more…
Source
49 CFR §172 (2026/05)

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Phosphorus, amorphous


Phosphorus is a chemical element; it has symbol P and atomic number 15. All elemental forms of phosphorus are highly reactive and are therefore never found in nature. Elemental phosphorus can be prepared artificially, the two most common allotropes being white phosphorus and red phosphorus. With 31P as its only stable isotope, phosphorus has an occurrence in Earth's crust of about 0.1%, generally as phosphate rock. Wikipedia

Substance Data

Source: PubChem (HSDB, 04.12.2019)

CAS-Number

7723-14-0

Flash Point

n/a

Boiling Point

n/a

Emergency Response Guide No. 133

Hazardous Materials Table

Source: 49 CFR §172 (2026/05)

(3) Hazard Class

4.1
Flammable solids

(4) Identification number Help

UN 1338

(5) Packing Group Help

III

(6) Labels Help

Flammable solids (4.1)

(7) Special Provisions (§172.102) Help

×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.
A1
A19
B1
B9
B26
IB8
IP3
T1
TP33

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

(8A) Exceptions151see 49 CFR §173.151
(8B) Non-bulk213see 49 CFR §173.213
(8C) Bulk243see 49 CFR §173.243

(9) Quantity Limits Help

(9A) Passenger aircraft/rail25 kg
(9B) Cargo aircraft only100 kg

(10) Vessel stowage Help

(10A) Location
(10B) Other

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.

Prohibited Must not be loaded, transported, or stored together in the same vehicle or facility.
Permitted May be loaded, transported, or stored together.
Restricted May be loaded, transported, or stored together only with restrictions.

Similar substances

UN / IDProper shipping nameHazard class
NA 1955Organic phosphate, mixed with compressed gas or Organic phosphate compound, mixed with compressed gas or Organic phosphorus compound, mixed with compressed gas2.3
UN 1381Phosphorus, white dry or Phosphorus, white, under water or Phosphorus white, in solution or Phosphorus, yellow dry or Phosphorus, yellow, under water or Phosphorus, yellow, in solution4.2
UN 3017Organophosphorus pesticides, liquid, toxic, flammable, flash point not less than 23 degrees C6.1
Ammunition, smoke (water-activated contrivances), without white phosphorus or phosphides, with burster, expelling charge or propelling charge, see Contrivances, water-activated, etc. (UN 0249)
UN 2784Organophosphorus pesticides, liquid, flammable, toxic, flash point less than 23 degrees C3
UN 0245Ammunition smoke, white phosphorus with burster, expelling charge, or propelling charge1.2H
UN 0246Ammunition, smoke, white phosphorus with burster, expelling charge, or propelling charge1.3H
UN 0244Ammunition, incendiary, white phosphorus, with burster, expelling charge or propelling charge1.3H
UN 0243Ammunition, incendiary, white phosphorus, with burster, expelling charge or propelling charge1.2H
Phosphorus (white or red) and a chlorate, mixtures ofForbidden
Ammunition, smoke (water-activated contrivances), white phosphorus, with burster, expelling charge or propelling charge, see Contrivances, water-activated, etc. (UN 0248)
UN 1339Phosphorus heptasulfide, free from yellow or white phosphorus4.1
UN 1340Phosphorus pentasulfide, free from yellow or white phosphorus4.3
UN 1341Phosphorus sesquisulfide, free from yellow or white phosphorus4.1
UN 1343Phosphorus trisulfide, free from yellow or white phosphorus4.1