Overview
Magnesium hexafluorosilicate (CAS 18972-56-0 ), also known as magnesium fluorosilicate, is an inorganic fluorosilicate salt used industrially as a surface hardening agent and biocidal preservative.
It is applied to porous substrates to improve durability, resist biological degradation, and modify surface chemistry across construction, textile, and water treatment processes.
In concrete and masonry treatment, it reacts with calcium hydroxide in cured cement to densify and harden surface layers, extending the service life of floors, pavements, and structural elements.
Textile and leather processors use it as a fixing and preservation agent, improving resistance to microbial attack in treated fabrics and hides during various stages of production.
In paper manufacturing, it functions as a surface modifier that improves wet strength and resistance to biological deterioration during storage or processing for industrial use.
Water treatment operations employ it as a fluoridating and conditioning agent in specific municipal and industrial treatment programs to ensure proper chemical balance and safety.
The product is supplied as a white crystalline powder or in aqueous solution, with solution concentrations typically ranging from 20% to 30% depending on the specific requirements.
The product is available in Technical grade for standard commercial specification. Purity levels and packaging formats vary by application, with bulk supply available for large-scale procurement.
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Physical Properties
| Melting Point | 120°C (dec.) |
| Density | 1,79 g/cm 3 |
| Appearance | White powder |
| Color | white |
| Form | Powder |
| pH | 3.1 |
Safety & Handling
Danger GHS06 GHS05 GHS07 GHS08 Hazard Statements H301 Toxic if swallowed H318 Causes serious eye damage H319 Causes serious eye irritation H320 Causes eye irritation H332 Harmful if inhaled H335 May cause respiratory irritation H372 Causes damage to organs through prolonged or repeated exposure H373 May causes damage to organs through prolonged or repeated exposure Precautionary Statements P260 Do not breathe dust/fume/gas/mist/vapours/spray. P261 Avoid breathing dust/fume/gas/mist/vapours/spray. P264 Wash … thoroughly after handling. P270 Do not eat, drink or smoke when using this product. P271 Use only outdoors or in a well-ventilated area. P280 Wear protective gloves/protective clothing/eye protection/face protection. P317 Get emergency medical help. P319 Get medical advice/attention if you feel unwell. P321 Specific treatment (see … on this label). P330 Rinse mouth. P405 Store locked up. P501 Dispose of contents/container in accordance with local regulations. P264+P265 Wash … thoroughly after handling. P301+P316 Get emergency medical help immediately. P304+P340 IF INHALED: Remove person to fresh air and keep comfortable for breathing. P337+P317 If eye irritation persists: Get medical advice/attention. Get emergency medical help. 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. P305+P354+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 | 28269080 |
Other Names
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Chemical Properties
- CAS Number
- 18972-56-0
- EC Number
- 606-187-0
- Mol. Weight
- 166.38
- HS Code
- 28269080
- Category
- Salts & Minerals