Salts & Minerals
REACH
Sodium metaphosphate
CAS Number
10361-03-2
EC Number
233-782-9
What is Sodium metaphosphate?
Sodium metaphosphate (CAS 10361-03-2) is an inorganic phosphate salt in several polymeric forms, including Kurrol's salt and Maddrell's salt.
Where is Sodium metaphosphate used?
- Water treatment: scale and corrosion control in cooling towers and municipal distribution systems
- Food and beverage: pH buffer and preservative in processed products, improving moisture retention in meat and dairy
- Textile and leather: sequestering hardness ions in dyebaths and tanning liquors
- Paper manufacturing: controlling metal ion contamination in pulp processing
- It functions as a sequestrant, buffering agent and scale inhibitor by sequestering calcium and magnesium ions.
Good to know: Grades vary by chain length and solubility, so buyers should confirm the specific polymerization form when sourcing.
Other Names (Synonyms)
Kurrol's salt|Sporix|Maddrell's salt|Sodium Kurrol's salt|Insoluble metaphosphate|Sodium metaphosphate (NaPO3)|532IUT7IRV|Metaphosphoric acid (HPO3), sodium salt (1:1)
What are the physical properties of Sodium metaphosphate?
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℃)
How is Sodium metaphosphate classified and handled safely? Learn More
Warning
GHS07· Irritant
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.
Which trade and regulatory codes apply to Sodium metaphosphate?
HS Code 2835 39 00
Storage Class 13 - Non Combustible Solids
WGK (Germany) 1