Chromium trioxide
CAS 1333-82-0
EC 215-607-8
Formula CrO3
MW 118.01 g/mol
Inorganic Acids Mining & MetalsWater TreatmentTextile, Leather & PaperPrinting & Packaging Preservation & BiocideSurface Modification & WettingBleaching & Whitening
Description
Chromium trioxide (CAS 1333-82-0, EC 215-607-8, formula CrO3) is an inorganic chromium compound commercially known as chromic acid or chromic anhydride. It carries no E-code designation and is classified under HS code 28191000 within the inorganic acids category.
In metal surface treatment, chromium trioxide forms a dense oxide conversion layer on aluminium and zinc substrates, providing corrosion resistance and adhesion for subsequent coatings. In leather processing, it acts as a biocidal preservative by oxidising microbial cell components, inhibiting bacterial growth during hide storage and transport.
Chromium trioxide is subject to REACH authorisation requirements under Annex XIV due to its classification as a substance of very high concern (SVHC). It is available in technical and industrial grades as dark-red crystalline flakes or granules. Procurement teams should confirm current authorisation status and supply chain compliance documentation prior to ordering.
In metal surface treatment, chromium trioxide forms a dense oxide conversion layer on aluminium and zinc substrates, providing corrosion resistance and adhesion for subsequent coatings. In leather processing, it acts as a biocidal preservative by oxidising microbial cell components, inhibiting bacterial growth during hide storage and transport.
Chromium trioxide is subject to REACH authorisation requirements under Annex XIV due to its classification as a substance of very high concern (SVHC). It is available in technical and industrial grades as dark-red crystalline flakes or granules. Procurement teams should confirm current authorisation status and supply chain compliance documentation prior to ordering.
Physical Properties
| 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℃) |
Safety & Handling (Learn More)
Danger GHS03 GHS05 GHS06 GHS07 GHS08 GHS09
H
H271H272H290H301H310H311H312H314H317H318H330H334H335H340H341H350H360H361H370H372H400H410
P
P203P210P220P233P234P260P261P262P264P270P271P272P273P280P283P284P316P317P318P319P320P321P330P363P390P391P403P405P406P420P501P264+P265P301+P316P302+P352P304+P340P306+P360P308+P316P333+P317P342+P316P361+P364P362+P364P370+P378P403+P233P301+P330+P331P302+P361+P354P305+P354+P338P371+P380+P375
Trade & Regulatory
| HS Code | 28191000 |
| UN Number | 1463 |
| ADR Class | 5.1 |
| Packing Group | II |
| Storage Class | 5.1A - Strongly oxidizing hazardous materials |
| WGK (Germany) | 3 |
Other Names
trioxochromiumchromic oxidechromic trioxidechromic anhydrideChromic acidCHROMERGE(TM)Chromia (CrO3)
Related Products
Raw Materials
Need a chemical? Get a quote within 24 hours.