Molecular Formula: NaH2PO4; NaH2PO4·H2O ; NaH2PO4·2H20
Molecular Weight: 119.98;137.99;156.01
CAS:7558-80-7(Anhydrous);10049-21-5(Monohydrate);13472-35-0(Dihydrate)
【Structural Formula】
1. Product Property
Food-grade sodium dihydrogen phosphate appears as white crystalline powder or granules. It is highly soluble in water (85g/100ml at 25°C) but insoluble in alcohol. The compound exhibits acidic properties with pH 4.1-4.5 (1% solution). It’s stable under normal conditions but decomposes at 200°C to form sodium polyphosphates. As a food additive, it’s non-toxic, odorless, and has good thermal stability.
2. Quality Standards
| Parameter | Specification |
| Assay (NaH2PO4) | ≥ 98.0% |
| P2O5 Content | ≥ 59.0% |
| pH (1% solution) | 4.1-4.5 |
| Water Insolubles | ≤ 0.2% |
| Heavy Metals (Pb) | ≤ 10 ppm |
| Arsenic (As) | ≤ 3 ppm |
| Fluoride (F) | ≤ 10 ppm |
| Loss on Drying | ≤ 0.5% |
3. Application Scope and Usage
Sodium dihydrogen phosphate serves multiple functions in food processing as an acidity regulator, emulsifier, and stabilizer. It’s widely used in dairy products, baked goods, and meat processing to improve texture and water retention. In beverages, it acts as a pH buffer. The compound also finds application in cheese production as an emulsifying salt and in seafood processing to maintain moisture. Typical usage levels range from 0.3% to 0.5% depending on application. It’s GRAS (Generally Recognized As Safe) by FDA when used within specified limits.
4. Package and Storage
The product is typically packaged in 25kg polyethylene-lined woven bags or 500kg bulk bags for industrial use. Retail quantities are available in 1kg HDPE bottles. Store in a cool, dry, well-ventilated area away from moisture and incompatible substances. The shelf life is 24 months when properly stored in original packaging. Avoid contact with strong acids or bases during handling. For food safety, ensure containers are tightly sealed after each use to prevent contamination. Transport as non-hazardous material under normal conditions.
