Professional Zinc Alloy Surface Finishing Solutions
Phosphoric Acid
Phosphoric Acid
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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
Phosphoric Acid is a professional acid & solvent supplied by QLQ for zipper, hardware and metal-finishing plants. Standard packing: Local Purchase in Bangladesh. 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 | Phosphoric Acid |
| Chemical formula | H3PO4 |
| CAS number | 7664-38-2 |
| Appearance | Colourless syrupy liquid |
| Grade / type | 85% technical grade |
| Standard packing | 25-50 kg steel or fibre drum, palletised for export |
What it is and what it does. Phosphoric acid is the acid of the phosphating process and the base of many derusting and deoxidising formulations. It converts a steel surface into a phosphate film that anchors paint and improves corrosion resistance.
- Supplied as an 85% clear syrupy liquid; as a mineral acid it is comparatively mild, so it attacks scale less aggressively than hydrochloric or sulfuric acid.
- On steel it forms a phosphate layer that is a far better paint base than a bare surface.
- Also used as a pH adjuster and as the acid component of aluminium brightening baths.
Typical Use in a Plating / Finishing Line
| Item | Typical guidance |
|---|---|
| Zinc phosphating | 10-30 g/L with the zinc salt and accelerator at 50-70 C |
| Derusting | 10-25% with a surfactant and an inhibitor |
| Bright dipping of aluminium | As specified by the process |
Safety, Handling & Storage
| Item | Requirement |
|---|---|
| Hazard classification | Corrosive (GHS05) — causes severe skin burns and eye damage |
| Personal protective equipment | Face shield + chemical goggles, acid-resistant gloves (nitrile/PVC), rubber apron and boots; local exhaust ventilation |
| Spill / first aid | Neutralise carefully with sodium carbonate or lime, then collect with inert absorbent; never add water to the concentrate |
| Storage | Store in original HDPE/PP containers, upright, in a cool ventilated area away from alkalis, cyanides, oxidisers and metals; bunded floor recommended |
| 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 controls the coating weight? | The free acid to total acid ratio, the temperature and the accelerator level - all measured by titration. |
| Is there a lead-free option? | Phosphoric acid itself is lead-free; only the additive package may contain heavy metals. |
| Product Name | Phosphoric Acid |
| Category | Acid & Solvent |
| Standard Packing | Local Purchase in Bangladesh |
| Net Weight | 25 KG per bag |
| Appearance | Clear to pale yellow liquid |
| 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 | Woven bag with PE liner |
| 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. |
Related Reading
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.
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 Phosphoric Acid for your line
Chemical fit is decided by the bath, not by the label. Send these four items and we confirm the operating window before you buy.
- Current bath: supplier, TDS and working concentration.
- Process: rack or barrel, temperature, current density.
- Substrate: zinc alloy, steel, brass or ABS.
- Complaint: the defect you are trying to solve, with photos.
| 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
Is the SDS available before we order?
Yes. SDS and COA are issued per lot. Tell us the destination country so the SDS is supplied in the required format and language.
Can we get a trial quantity first?
Yes. Trial packs are quoted separately and shipped with the analytical method, so your lab can verify the material against the current bath before switching.
What packing and shelf life should we expect?
Standard export packing in drums or jerry cans with inner liner. Shelf life depends on the product - typically 12 months in a closed container, stored away from heat and direct sunlight.
How is it shipped - is it dangerous goods?
Some products are classed as dangerous goods and need the correct UN packing and documentation. We confirm the classification and the shipping route before quoting freight.
Can you match a competitor's additive?
Send the TDS and a bath sample. We compare the operating window and analytical method, then run a Hull cell panel before recommending a replacement.
Put Phosphoric Acid 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
