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Ammonium dichromate

Description References
Ammonium dichromate
Ammonium dichromate structure
Chemical Name:
Ammonium dichromate
ammoniumdichromat;ammoniumbichromaat;ammoniumdichromaat;AMMONIUM BICHROMATE;AMMONIUM DICHROMATE;diammoniumdichromate;bichromated’ammonium;ammonio(bicromatodi);ammonio(dicromatodi);AMMONIUM PYROCHROMATE
Molecular Formula:
Formula Weight:
MOL File:

Ammonium dichromate Properties

Melting point:
170 °C (dec.)(lit.)
vapor density 
8.7 (vs air)
H2O: 1 M at 20 °C, clear, colorless
Orange to red
PH Range
3 - 4
Oxidising Properties
The substance or mixture is classified as oxidizing with the subcategory 2
Water Solubility 
360 g/L (20 ºC)
170 °C
Stability Strong oxidizer - contact with flammable materials may cause fire. Reactions carried out in closed vessels may lead to explosion. Incompatible with organic materials, strong reducing agents.
CAS DataBase Reference
7789-09-5(CAS DataBase Reference)
EWG's Food Scores
EPA Substance Registry System
Ammonium dichromate(VI) (7789-09-5)
  • Risk and Safety Statements
Signal word  Danger
Hazard statements  H302-H318-H360-H400-H272-H301-H312-H314-H317-H330-H334-H340-H350-H360FD-H372-H410
Precautionary statements  P201-P210-P260-P280-P304+P340+P310-P305+P351+P338-P221-P303+P361+P353-P304+P340-P320-P405-P501a
Hazard Codes  E,T+,N
Risk Statements  45-46-60-61-2-8-21-25-26-34-42/43-48/23-50/53
Safety Statements  53-45-60-61
RIDADR  UN 1439 5.1/PG 2
WGK Germany  3
RTECS  HX7650000
Autoignition Temperature 218°C
HazardClass  5.1
PackingGroup  II
HS Code  28415000
Toxicity LDLo scu-gpg: 25 mg/kg EQSSDX 1,1,75
NFPA 704
2 1

Ammonium dichromate price More Price(6)

Manufacturer Product number Product description CAS number Packaging Price Updated Buy
Sigma-Aldrich 402826 Ammonium dichromate ACS reagent, ≥99.5% 7789-09-5 100g $109 2021-03-22 Buy
Sigma-Aldrich 450138 Ammonium dichromate 99.999% trace metals basis 7789-09-5 25g $168 2021-03-22 Buy
Alfa Aesar 043180 Ammonium dichromate 99.999% (metals basis) 7789-09-5 25g $130 2021-03-22 Buy
Alfa Aesar 043180 Ammonium dichromate 99.999% (metals basis) 7789-09-5 100g $466 2021-03-22 Buy
Alfa Aesar 013444 Ammonium dichromate, ACS 99.5% min 7789-09-5 500g $79.8 2021-03-22 Buy

Ammonium dichromate Chemical Properties,Uses,Production


Ammonium dichromate is a salt consisting of ammonium ions and dichromate ions. It can be used as in pyrotechinics, photography as well as lithography. It can be used as a catalyst and a source of pure nitrogen in the laboratory. It can also be used as the mordant of dyeing pigment. It has application in the manufacturing of alizarin, chrome alum, leather tanning and oil purification. Moreover, it can be used for the production of phosphor raster of television screen through acting as the photoactive site. Finally, there are also reports using it for combustion synthesis of perovskite LnCrO3 powder and oxidation of hydroquinones, catechols and phenols.


Havard, Jennifer M., et al. "Design of Photoresists with Reduced Environmental Impact. 1. Water-Soluble Resists Based on Photo- Cross-Linking of Poly(vinyl alcohol)." Plos One 8.4(1999):-.
Kingsley, J. J., and L. R. Pederson. "Combustion synthesis of perovskite LnCrO3 powders using ammonium dichromate." Materials Letters 18.1-2 (1993): 89-96.
Fischer, Alfred, and George N. Henderson. "Oxidation of hydroquinones, catechols, and phenols using ceric ammonium nitrate and ammonium dichromate coated on silica: an efficient and convenient preparation of quinones." Synthesis 1985.6/7 (1985): 641 -643.
Suzuki, S. "Determination of Chromium Atom Density on Deep UV Exposed Ammonium-Dichromated Gelatin Films with Ultraviolet Absorption Spectra." Journal of the Electrochemical Society135.10 (1988):2615-2620.

Chemical Properties

bright orange-red crystals

Chemical Properties

Ammonium dichromate is a combustible, orange-red crystalline solid which is used in solution.


Bright orange-red monoclinic crystals; odorless; hygroscopic; decomposes at 180°C; density 2.115 g/cm3 at 25°C; readily dissolves in water (26.67 g/100 g at 20°C).


Yellow needles made by chromic acid acting on ammonium hydroxide. The product is produced by crystallization. Ammonium dichromate was used interchangeably with potassium dichromate for sensitizing gelatin, albumen, gums, and other colloids that were used for pigment processes. Ammonium dichromate is more sensitive than the potassium alternative.


It is used in oxidimetric standard.


Source of pure nitrogen (esp in the laboratory); in pyrotechnics (Vesuvius fire); in lithography and photo engraving; in special mordant, catalysts, and porcelain finishes; intermediate in the manufacture of pigments; of magnetic recording materials.

General Description

Ammonium dichromate is a bright orange red crystalline solid. Ammonium dichromate is readily ignited and burns producing a voluminous green residue. If heated in a closed container, the container may rupture due to the decomposition of the material. Ammonium dichromate may also act as a strong oxidizing agent if mixed with or contaminated with combustible material. Ammonium dichromate is soluble in water.

Air & Water Reactions

Water soluble.

Reactivity Profile

Ammonium dichromate is an oxidizing reagent, Ammonium dichromate readily reacts with reducing materials, in large quantity Ammonium dichromate may produce a violent reaction. Direct exposure to heat or shock will explode it. When heated to decomposition Ammonium dichromate emits toxic fumes of ammonia and nitrogen oxides [Sax, 9th ed., 1996, p. 205].


Dusts and solutions are toxic, irritating to eyes and skin; dangerous fire risk. Strong oxidizing agent may explode in contact with organic materi- als. TLV: 0.05 mg(Cr)/m 3 ; Confirmed human car- cinogen.

Health Hazard

Inhalation causes irritation or ulceration of the mucous membranes of the nose, throat or respiratory tract. Respiratory irritation can produce symptoms resembling those of asthma. Continuing irritation of the nose may lead to perforation of the nasal septum. External contact can cause eye irritation and conjunctivitis, irritation and ulceration of skin wounds, and rash or external ulcers. If ingested, irritates mucous membrane and causes vomiting.

Safety Profile

Confirmed human carcinogen. Poison by inhalation, ingestion, skin contact, and subcutaneous routes. See also CHROMIUM COMPOUNDS. An unstable oxidizer. Moderately flammable; reacts with reducing agents.

Potential Exposure

It is used in dyeing, leather tanning and to make fireworks and chromic oxide; in lithography and photoengraving; in manufacture of special mordants and catalysts.


UN1439 Ammonium dichromate, Hazard Class: 5.1; Labels: 5.1-Oxidizer.

Purification Methods

It crystallises from weak aqueous HCl (ca 1mL/g). It decomposes rapidly on heating. (Possible carcinogen and is POISONOUS)


An unstable oxidizer; freezing/melting point5(decomposes below MP) 180 C; decomposition becomes self-sustaining and violent at about 225 C. Contact with combustible, organic or other easily oxidized materials, strong acids; hydrazine and other reducing agents; alcohols, sodium nitrite may cause fire and explosions.

Waste Disposal

Consult with environmental regulatory agencies for guidance on acceptable disposal practices. Generators of waste containing this contaminant (≥100 kg/mo) must conform with EPA regulations governing storage, transportation, treatment, and waste disposal. Add a large volume of a reductant solution (hypo, bisulfite or ferrous salt and acidify with sulfuric acid). Neutralize when reduction is complete and flush to sewer with large volume of water.

Ammonium dichromate Preparation Products And Raw materials

Raw materials

Preparation Products

Ammonium dichromate Suppliers

Global( 146)Suppliers
Supplier Tel Fax Email Country ProdList Advantage
career henan chemical co
+86-371-86658258 CHINA 29959 58
Hubei Jusheng Technology Co.,Ltd.
027-59599243 CHINA 28229 58
Chongqing Chemdad Co., Ltd
+86-13650506873 CHINA 37282 58
ShenZhen Ipure Biology import and export company co.,ltd
18071025641 18071025641 CHINA 11336 58
Mainchem Co., Ltd. +86-0592-6210733
+86-0592-6210733 CHINA 32439 55
Chemwill Asia Co.,Ltd. 86-21-51086038
86-21-51861608;;; CHINA 23975 58
J & K SCIENTIFIC LTD. 400-666-7788 010-82848833-
86-10-82849933; China 96815 76
Meryer (Shanghai) Chemical Technology Co., Ltd. 400-660-8290 21-61259100-
86-21-61259102 China 40264 62
Alfa Aesar 400-610-6006
021-67582001/03/05 China 30159 84
Adamas Reagent, Ltd. 400-600-9262 China 13915 59

View Lastest Price from Ammonium dichromate manufacturers

Image Release date Product Price Min. Order Purity Supply Ability Manufacturer
2021-07-02 Ammonium dichromate
US $15.00-10.00 / KG 1KG 99%+ HPLC Monthly supply of 1 ton Zhuozhou Wenxi import and Export Co., Ltd
2019-07-14 Ammonium dichromate
US $1.00 / KG 1KG 99% 25kg career henan chemical co

Ammonium dichromate Spectrum

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