Professional Zinc Alloy Surface Finishing Solutions
Selenium Dioxide
Selenium Dioxide
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Shipping & lead time: contact us for a quote. Packing and delivery terms depend on the product and destination.
Product description
Shipping & Return
Product Overview
Selenium Dioxide is a professional plating salt supplied by QLQ for zipper, hardware and metal-finishing plants. Standard packing: 25KG/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 | Selenium Dioxide |
| Chemical formula | SeO2 |
| CAS number | 7446-08-4 |
| Appearance | White to pale yellow crystalline powder |
| Grade / type | Technical grade, >=98% |
| Standard packing | 25-50 kg steel or fibre drum, palletised for export |
What it is and what it does. Selenium dioxide is the additive that produces the blue-black colour of the black chromate conversion coating on zinc and the dark tones of some antiquing finishes.
- White to pale yellow crystalline powder, soluble in water; used at low concentration in the chromate bath.
- It is a selenium compound and is toxic - dust control and closed handling are essential.
- Overdosing shifts the colour from blue-black towards a lighter grey or brown.
Typical Use in a Plating / Finishing Line
| Item | Typical guidance |
|---|---|
| Black chromate on zinc | 0.5-3 g/L in the chromate bath, as specified by the formulation |
| Colour control | Adjust in small increments and check against a colour standard |
Safety, Handling & Storage
| Item | Requirement |
|---|---|
| Hazard classification | Oxidiser + irritant (GHS03/GHS07) — strong oxidiser, may intensify fire |
| Personal protective equipment | Goggles, nitrile gloves, dust mask; avoid contact with skin and eyes |
| Spill / first aid | Sweep or dilute with water, do not mix with combustible material or reducing agents; rinse to effluent treatment |
| Storage | Cool, dry, ventilated store away from acids, reducing agents, solvents and combustible material; do not store next to heat sources |
| 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 |
|---|---|
| What is the maximum selenium level? | Check the destination market limits before use; selenium is restricted in several countries. |
| How is it dosed? | Dissolve in a small volume of water and add slowly - never add dry powder to a hot bath. |
| Product Name | Selenium Dioxide |
| Category | Plating Salt |
| Standard Packing | 25KG/DRUM |
| Net Weight | 25 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. |
Shipping cost is based on weight. Just add products to your cart and use the Shipping Calculator to see the shipping price.We want you to be 100% satisfied with your purchase. Items can be returned or exchanged within 30 days of delivery.
Specifying Selenium Dioxide for your line
Send the four details below and we confirm fit, packing and price the same working day.
- Application: which tank or process it serves.
- Dimensions or capacity: drawing preferred.
- Material: where it contacts chemicals or heat.
- Quantity: first order and expected annual use.
| What you send | What you get back |
|---|---|
| Part drawing or sample | Compatibility check and recommended settings |
| Output target per shift | Capacity, tank or rack count, manpower |
| Finish spec with tolerance | Control points and acceptance tests |
| Site conditions (power, water, space) | Layout proposal and utility requirements |
Buying questions we answer most
What is the minimum order quantity?
One carton or one unit for most items. Trial quantities are quoted separately from production volumes.
Can it be customised?
Dimensions, material and surface treatment can be adapted. Send a drawing or a sample and we confirm what changes and what stays standard.
What is the lead time?
Stock items ship within a week of confirmation; made-to-order items typically 20-35 days.
What documentation comes with the shipment?
Packing list, material certificate where applicable, and export documents prepared per destination.
Put Selenium Dioxide into a process
- Process overview - how each stage connects
- Plating workshop - rack and barrel line layout
- Painting workshop - spray, cure and colour control
- Product overview - what else the line needs
