Inorganic Acids & Bases
REACH
Chromium trioxide
CAS Number
1333-82-0
EC Number
215-607-8
What is Chromium trioxide?
Chromium trioxide (CAS 1333-82-0), also known as chromic trioxide, is a strong inorganic oxidizing agent used primarily in metal surface treatment and electroplating.
Where is Chromium trioxide used?
- Hard chrome electroplating: electrolyte bath depositing wear-resistant chromium coatings on industrial components, tooling and hydraulic parts
- Metal surface treatment: conversion coatings that improve corrosion resistance and paint adhesion on aluminum and steel
- Leather tanning: fixes hides for durable leather in footwear and upholstery
- Specialty printing and packaging: oxidizing agent in pigment production and surface etching
Good to know: Classified as a substance of very high concern under REACH; strict regulatory compliance documentation is required.
Commercial specifications
- Technical grade, purity typically 99% or higher
- Drums and bulk quantities
Other Names (Synonyms)
red oxide of chromium|monochromium trioxide|chromic trioxide|chromic oxide|chromic anhydride|anhydride chromique|Chromium(VI) oxide|CrO3
What are the physical properties of Chromium trioxide?
Melting Point 197 °C
Boiling Point 330 °C
Density 2.70 g/cm³
Flash Point 250°C
Appearance Chromium trioxide is a dark-red crystalline substance. It is odorless
Color Reddish-violet
Form macroporous
Water Solubility Highly soluble
Vapor Pressure 0Pa at 25℃
pH <1 (100g/l, H2O, 20℃)
How is Chromium trioxide classified and handled safely? Learn More
Danger
GHS03· Oxidizing GHS05· Corrosive GHS06· Toxic GHS07· Irritant GHS08· Health Hazard GHS09· Environmental Hazard
Hazard Statements
H271 May cause fire or explosion; strong Oxidizer
H272 May intensify fire; oxidizer
H290 May be corrosive to metals
H301 Toxic if swallowed
Precautionary Statements
P203 Obtain, consult and follow expert instructions for use.
P210 Keep away from heat, hot surfaces, sparks, open flames and other ignition sources. No smoking.
P220 Keep away from clothing and other combustible materials.
P233 Keep container tightly closed.
Which trade and regulatory codes apply to Chromium trioxide?
HS Code 28191000
UN Number 1463
ADR Class 5.1
Packing Group II
Storage Class 5.1A - Strongly oxidizing hazardous materials
WGK (Germany) 3