Potassium nitrate

Potassium nitrate is a chemical compound with a sharp, salty, bitter taste and the chemical formula KNO3. It is an ionic salt of potassium ions K+ and nitrate ions NO3−, and is therefore an alkali metal nitrate. It occurs in nature as a mineral, niter (or nitre in the UK). It is a source of nitrogen, and nitrogen was named after niter. Wikipedia

Substance Data

Source: TOXNET

CAS-Number

7757-79-1

Flash Point

n/a

Boiling Point

n/a

Emergency Response Guide No. 140

Data from the Hazardous Materials Table

Source: 49 CFR §172 (2018/07)

(3) Hazard Class

5.1
Oxidizers

(4) Identification number

UN 1486

(5) Packing Group

III

(6) Labels

(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.

A1	Single packagings are not permitted on passenger aircraft. Browse special provision A1
A29	Combination packagings consisting of outer expanded plastic boxes with inner plastic bags are not authorized for transportation by aircraft. Browse special provision A29
B120 IB8	see 49 CFR §172.102
IP3	Flexible IBCs must be sift-proof and water- resistant or must be fitted with a sift- proof and water-resistant liner. Browse special provision IP3
T1	see 49 CFR §172.102
TP33	The portable tank instruction assigned for this substance applies for granular and powdered solids and for solids which are filled and discharged at temperatures above their melting point which are cooled and transported as a solid mass. Solid substances transported or offered for transport above their melting point are authorized for transportation in portable tanks conforming to the provisions of portable tank instruction T4 for solid substances of packing group III or T7 for solid substances of packing group II, unless a tank with more stringent requirements for minimum shell thickness, maximum allowable working pressure, pressure-relief devices or bottom outlets are assigned in which case the more stringent tank instruction and special provisions shall apply. Filling limits must be in accordance with portable tank special provision TP3. Solids meeting the definition of an elevated temperature material must be transported in accordance with the applicable requirements of this subchapter. Browse special provision TP33
W1	This substance in a non friable prill or granule form is not subject to the requirements of this subchapter when tested in accordance with the UN Manual of Test and Criteria (IBR, see §171.7 of this subchapter) and is found to not meet the definition or criteria for inclusion in Division 5.1. Browse special provision W1

(8) Packing Authorizations (§173.***)

(8A) Exceptions	152	see 49 CFR §173.152
(8B) Non-bulk	213	see 49 CFR §173.213
(8C) Bulk	240	see 49 CFR §173.240

(9) Quantity Limits

(9A) Passenger aircraft/rail	25 kg
(9B) Cargo aircraft only	100 kg

(10) Vessel stowage

(10A) Location	A 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	n/a

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.

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

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

Substances with similar name

UN-Number	Name	Hazard Class
	Chlorate of potash, see Potassium chlorate
UN 1626	Mercuric potassium cyanide	6.1
UN 1643	Mercury potassium iodide	6.1
UN 2257	Potassium	4.3
UN 1677	Potassium arsenate	6.1
	Potassium bisulfite solution, see Bisulfites, aqueous solutions, n.o.s.
UN 1870	Potassium borohydride	4.3
UN 1484	Potassium bromate	5.1
UN 2427	Potassium chlorate, aqueous solution	5.1
UN 1679	Potassium cuprocyanide	6.1
UN 1929	Potassium dithionite or Potassium hydrosulfite	4.2
UN 1812	Potassium fluoride, solid	6.1
UN 3422	Potassium fluoride solution	6.1
UN 2628	Potassium fluoroacetate	6.1
UN 1811	Potassium hydrogendifluoride solid	8
UN 3421	Potassium hydrogendifluoride solution	8
	Potassium hydrosulfite, see Potassium dithionite
UN 1814	Potassium hydroxide, solution	8
UN 1487	Potassium nitrate and sodium nitrite mixtures	5.1
UN 1492	Potassium persulfate	5.1
UN 2012	Potassium phosphide	4.3
UN 1422	Potassium sodium alloys, liquid	4.3
UN 3404	Potassium sodium alloys, solid	4.3
UN 1382	Potassium sulfide, anhydrous or Potassium sulfide with less than 30 percent water of crystallization	4.2
UN 1847	Potassium sulfide, hydrated with not less than 30 percent water of crystallization	8