white crystalline powder
| Parameter name | Value |
|---|---|
| Mass fraction of sodium polyphosphate in terms of phosphorus (V) oxide, %, min | 66,9 |
| Mass fraction of inactive phosphates in terms of phosphorus (V) oxide, %, max | 1,2 |
| Mass fraction of water insoluble substances, %, max | ≤ 0,1 |
The product is derived from phosphoric acid.
Precautionary measures: Dangerous if swallowed or in eyes.
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In commercial documents, sodium polyphosphate is often designated as sodium hexametaphosphate or SHMP. For purchasing, it is important to check not only the name but also GOST 20291-80, the formula NaPO₃, appearance, the mass fraction of sodium polyphosphate calculated as P₂O₅, the amount of inactive phosphates and water-insoluble substances. This helps distinguish a suitable batch from similar phosphate products and correctly match the raw material to the enterprise’s internal specification.
Sodium polyphosphate per GOST 20291-80 can be supplied as a glassy transparent substance in pieces, while the imported product is often presented as a white crystalline powder. Individual indicators also differ: P₂O₅ content, the proportion of inactive phosphates and water-insoluble substances. So the batch format is better agreed in advance.
When receiving sodium polyphosphate, the integrity of the bags, labelling, production date, quality certificate and the batch’s compliance with the GOST or agreed specification are checked. Laboratory control focuses on the mass fraction of sodium polyphosphate calculated as phosphorus (V) oxide, the amount of inactive phosphates and water-insoluble substances. Visually, the product should match the stated form: glassy pieces or white crystalline powder, without wetting, contamination or foreign inclusions.
Sodium polyphosphate is stored in dry, unheated warehouse rooms, in sealed factory packaging and protected from moisture. If it gets wet, the product can cake, become contaminated and harder to dose, especially if supplied in powdered form. Bags are placed on pallets, separately from substances that could affect batch purity. For a wholesale buyer, the quality certificate, labelling, production date, batch traceability and observance of the guaranteed shelf life are important.
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