Overview
Sodium metaphosphate (CAS 10361-03-2 ) is an inorganic phosphate salt available in several polymeric forms, including Kurrol's salt and Maddrell's salt. Each form features distinct chain lengths and solubility profiles relevant to industrial sourcing decisions.
It functions primarily as a sequestrant, buffering agent, and scale inhibitor across a range of process industries. In water treatment, it controls scale formation and corrosion in cooling towers and municipal distribution systems.
The compound works by sequestering calcium and magnesium ions to prevent buildup. Food and beverage manufacturers use it as a pH buffer and preservative in processed products, where it also improves moisture retention in meat and dairy applications.
Textile and leather processors apply it to sequester hardness ions in dyebaths and tanning liquors. This prevents mineral interference that degrades color consistency and finish quality during the manufacturing process.
In paper manufacturing, it supports pulp processing by controlling metal ion contamination. Without this control, metal ions would otherwise affect bleaching efficiency and the final brightness of the paper product.
Sodium metaphosphate is supplied as a white powder or granules depending on the polymeric form and intended application. Food-grade material is available to FCC specification for use in regulated industries.
Technical-grade product is supplied for industrial water treatment and various process applications. Grades vary by chain length and solubility, so buyers should confirm the specific polymerization form when sourcing.
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Physical Properties
| Melting Point | 628 °C |
| Density | 2.500 g/cm³ (solid) @ Temp: 25 °C |
| Form | solid |
| Water Solubility | 1000g/L |
| pH | 5.7 (10g/l, H2O, 20℃) |
Safety & Handling
Warning GHS07 Hazard Statements H315 Causes skin irritation H319 Causes serious eye irritation H335 May cause respiratory irritation Precautionary Statements P261 Avoid breathing dust/fume/gas/mist/vapours/spray. P264 Wash … thoroughly after handling. P271 Use only outdoors or in a well-ventilated area. P280 Wear protective gloves/protective clothing/eye protection/face protection. P319 Get medical advice/attention if you feel unwell. P321 Specific treatment (see … on this label). P405 Store locked up. P501 Dispose of contents/container in accordance with local regulations. P264+P265 Wash … thoroughly after handling. P302+P352 IF ON SKIN: Wash with plenty of water. P304+P340 IF INHALED: Remove person to fresh air and keep comfortable for breathing. P332+P317 Get emergency medical help. P337+P317 If eye irritation persists: Get medical advice/attention. Get emergency medical help. P362+P364 Take off contaminated clothing and wash it before reuse. P403+P233 Store in a well-ventilated place. Keep container tightly closed. P305+P351+P338 IF IN EYES: Rinse cautiously with water for several minutes. Remove contact lenses, if present and easy to do. Continue rinsing.
Trade & Regulatory
| HS Code | 2835 39 00 |
| Storage Class | 13 - Non Combustible Solids |
| WGK (Germany) | 1 |
Other Names
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Chemical Properties
- CAS Number
- 10361-03-2
- EC Number
- 233-782-9
- Mol. Weight
- 101.962
- HS Code
- 2835 39 00
- Category
- Chelating Agents