Views: 0 Author: Site Editor Publish Time: 2026-05-29 Origin: Site
In the world of industrial chemistry,Sodium Dihydrogen Phosphate (MSP)（also known as Monosodium Phosphate or Sodium Phosphate Monobasic） is a workhorse. Whether you are formulating a phosphating solution for automotive parts or conditioning boiler feed water, the purity of this raw material determines your success rate.
As a direct manufacturer adhering to the Chinese Chemical Industry Standard HG/T 2767-2009, we provide two industrial-grade variants: Dihydrate (NaH₂PO₄·2H₂O) and Anhydrous (NaH₂PO₄). Below is a technical guide to help you select the right grade without compromising on quality.
Understanding the physical and chemical differences between the two forms ensures optimal performance in your specific process.
| Parameter | Industrial Dihydrate | Industrial Anhydrous |
|---|---|---|
| Chemical Formula | NaH₂PO₄·2H₂O | NaH₂PO₄ |
| Appearance | White Crystalline Powder | White Powder/Crystals |
| Main Content (Dry Basis) | ≥ 98.0% | ≥ 98.0% |
| Loss on Drying | Not Specified | ≤ 2.0% |
| Best For | General phosphating, water softening | Low-moisture systems, high-concentration needs |
While many suppliers offer "98% purity," the devil is in the trace impurities. We strictly follow the table below to ensure your bath solution remains stable and sludge-free.
For a 10g/L aqueous solution, we guarantee a pH range of 4.2 – 4.6.
Why it matters: This precise acidity ensures consistent etching on metal surfaces during phosphating, promoting fine crystal formation.
| Parameter | Guaranteed Value | Risk if Out of Spec |
|---|---|---|
| Water Insolubles | ≤ 0.10% | Clogged nozzles in spray phosphating lines. |
| Iron (Fe) | ≤ 0.05% | Causes yellow discoloration on phosphating film. |
| Chlorides (as Cl) | ≤ 0.40% | High risk: Leads to pitting corrosion on metal. |
| Sulphates (as SO₄) | ≤ 0.5% | Creates white salt spots on dried surfaces. |
| Arsenic (As) | ≤ 0.01% | Critical for operator safety & wastewater limits. |
| Fluoride (F) | ≤ 0.05% | Required for environmental compliance. |
Technical Note: For high-end electroplating or automotive E-coat lines, we offer customized batches with Chloride (Cl) content below 0.10% , far exceeding standard HG/T 2767-2009 requirements.
Root Cause: High levels of Calcium/Magnesium impurities or insoluble matter in the raw salt.
Our Solution: Our rigorous filtration process ensures Water Insolubles are ≤0.1%, significantly reducing tank cleaning frequency and hazardous waste disposal costs.
Root Cause: Fluctuating pH or high Iron (Fe) content in the phosphate.
Our Solution: We maintain a strict pH tolerance of 4.2–4.6, ensuring a stable bath environment and dense phosphate crystal layers.
Process Excellence: We utilize a neutralization method (Soda Ash + Phosphoric Acid) with multi-stage precision filtration. Unlike outdated evaporation processes, our PLC-controlled lines ensure zero batch-to-batch variation.
Complete Transparency: Every shipment comes with a detailed Certificate of Analysis (COA) based on HG/T 2767-2009.
Logistics Ready:
Packaging: 25kg PP/PE bags, 500kg, or 1000kg jumbo bags.
Moisture Protection: Double-layer PE inner liner prevents caking during monsoon seasons.
Selecting Industrial Grade Sodium Dihydrogen Phosphate isn't just about the main content; it's about the stability of chlorides, sulfates, and water insolubles.
Whether you need the cost-effective Dihydrate form or the concentrated Anhydrous form, our HG/T 2767-2009 compliant products are engineered to optimize your metal treatment or water conditioning process.
Request your free sample today and verify the COA against your production line.
