分子式：Na4P2O7;Na4P2O7·10H2O
Molecular Weight: 265.91;446.07
CAS NO.:7722-88-5(Anhydrous);13472-36-1(Decahydrate )
構造式
1.製品特性
Food-grade sodium pyrophosphate is a white crystalline powder or granular solid, highly soluble in water but insoluble in alcohol. It has a strong alkaline pH (9.9–10.7 in 10 g/L solution) and acts as a chelating agent for metal ions. The anhydrous form melts at 880°C, while the decahydrate loses water at 100°C. It is hygroscopic, absorbing moisture from air, and hydrolyzes to disodium phosphate when boiled in water
2.品質基準
| パラメータ | 仕様 |
| Assay (Na₄P₂O₇) | ≥ 96.5% (anhydrous) / ≥ 98.0% (decahydrate) |
| pH (10 g/L solution) | 9.9–10.7 |
| ヒ素（As） | ≤ 3 mg/kg |
| 重金属（鉛） | ≤ 10 mg/kg |
| フッ化物 (F) | ≤ 50 mg/kg |
| ウォーター・インソルブル | ≤ 0.2% |
| Phosphate Test | Passes |
| 点火損 | ≤ 0.5% (anhydrous) |
3.適用範囲と使用方法
As a food additive, it works as a quality improver. In meat products, it retains moisture, improves tenderness and juiciness. In seafood, it prevents discoloration. Used in dairy to stabilize emulsions, in baked goods to enhance texture. Also functions as a sequestrant in beverages, with usage levels generally 0.05% – 0.5%, following food additive regulations.
4.パッケージと保管
Packed in polyethylene – lined woven bags, paper bags, or composite plastic bags, with common net weights like 25kg/50kg. Store in a cool, dry, ventilated warehouse. Avoid moisture, direct sunlight, and contact with acids. Keep sealed to prevent caking and quality deterioration. Shelf life is around 24 months under proper storage conditions.
