Product Overview
Chromium Trioxide is a professional plating salt supplied by QLQ for zipper, hardware and metal-finishing plants. Standard packing: 50KG/DRUM. Regular supply for customers in Bangladesh, Pakistan, India and other markets, with export-standard packing and documentation.
Product Identity (Encyclopaedia Card)
| Property | Value |
|---|
| Chemical name | Chromium Trioxide |
| Chemical formula | CrO3 |
| CAS number | 1333-82-0 |
| Appearance | Dark red to purple flakes |
| Grade / type | Electroplating grade |
| Standard packing | 25-50 kg steel or fibre drum, palletised for export |
What it is and what it does. Chromium trioxide (chromic acid) is the electrolyte of the chrome plating bath - both decorative chrome over nickel and hard chrome for wear resistance.
- Dark red to purple flakes, extremely soluble and strongly oxidising.
- Decorative chrome runs at 150-250 g/L with a small amount of sulfate as catalyst; hard chrome at 180-250 g/L with a much higher current density.
- Uniquely, chromium is plated from a solution in which the metal is not the main constituent - the anodes are lead alloys and the metal is supplied by the chromic acid itself.
Typical Use in a Plating / Finishing Line
| Item | Typical guidance |
|---|
| Decorative chrome bath | 150-250 g/L CrO3 at a 100:1 chromic acid to sulfate ratio, 20-45 C |
| Hard chrome bath | 180-250 g/L, 50-60 C, 15-60 A/dm2 |
| Anodes | Lead-tin or lead-antimony anodes are standard |
| Ventilation | Chromic acid mist is a serious health hazard - the tank needs a proper exhaust |
Safety, Handling & Storage
| Item | Requirement |
|---|
| Hazard classification | Carcinogenic (GHS08) + corrosive + oxidising — strong sensitiser |
| Personal protective equipment | Full face shield, nitrile gloves, dust mask or respirator, coverall; closed handling to avoid dust |
| Spill / first aid | Collect dry where possible; reduce residues with sodium bisulfite solution, then treat as chromium-bearing waste |
| Storage | Sealed containers in a dry, locked store away from acids, reducing agents and combustible material; containment tray required |
| Transport | Classified and packed according to IATA/IMDG for the hazard class; UN number and packing group stated on the shipping documents |
Quality Documents Shipped With Every Batch
| Document | Comment |
|---|
| COA (certificate of analysis) | Provided with the shipment; batch traceable to the production date |
| MSDS (safety data sheet) | Provided with the shipment; batch traceable to the production date |
| Packing list | Provided with the shipment; batch traceable to the production date |
| Commercial invoice | Provided with the shipment; batch traceable to the production date |
| Certificate of origin on request | Provided with the shipment; batch traceable to the production date |
Buyer Questions We Answer Every Week
| Question | Answer |
|---|
| How is the sulfate catalyst controlled? | By analysis of the chromic acid to sulfate ratio and by titration with barium chloride. |
| What is the trivalent chromium level? | Normally kept at 1.5-4 g/L; it is measured by titration and controlled with a high-area dummy cathode. |
| Product Name | Chromium Trioxide |
| Category | Plating Salt |
| Standard Packing | 50KG/DRUM |
| Net Weight | 50 KG per drum |
| Appearance | White to off-white crystalline powder or granules |
| MOQ | 1 drum / 1 bag |
| Delivery | 7-15 days after payment confirmation |
Key Specifications
| Item | Value |
|---|
| Purity / Assay | Industrial grade, COA available on request |
| Packaging Material | Plastic drum, sealed |
| Shelf Life | 12 months in sealed original packing |
| Origin | China |
| Documents | COA, MSDS, packing list, commercial invoice |
Packing & Storage
| Condition | Requirement |
|---|
| Temperature | 5-35 °C, away from direct sunlight |
| Humidity | Dry, ventilated warehouse; keep sealed against moisture |
| Stacking | Max 4 layers for drums, follow pallet markings for bags |
| Shelf Check | FEFO - first expired, first out |
Precautions
- Wear chemical-resistant gloves and safety goggles when handling
- Read MSDS before first use; keep away from incompatible materials
- Spill: collect with inert absorbent, do not wash into drains
- Store locked, out of reach of untrained personnel
FAQ
| Question | Answer |
|---|
| Can you provide COA / MSDS? | Yes, COA and MSDS are provided with every shipment. |
| What is the MOQ? | MOQ is 1 bag / 1 drum. Mixed loading of different chemicals is accepted. |
| Do you provide dosing guidance? | Yes, QLQ engineers provide free bath set-up and dosing consultation based on Hull-cell results. |
| How about shipping? | 7-15 days by sea or air depending on quantity and destination port. |
What Would You Like to Solve?
QLQ supplies the full line — equipment, chemistry and the working documents that make them run — to hardware and zipper factories in 60+ global markets. Contact us to discuss your application, or explore the complete solutions.
