Overview
Sodium methallylsulfonate (CAS 1561-92-8 ), commonly abbreviated as SMAS, is a reactive sulfonate monomer used as a functional comonomer in polymer synthesis. It introduces anionic sulfonate groups into polymer backbones.
This chemical enables targeted performance modifications in industrial formulations. In water treatment, SMAS is copolymerized into scale inhibitors and dispersants that prevent mineral deposition in cooling towers.
These industrial water systems benefit from the enhanced stability provided by the monomer. Textile and paper processing operations use SMAS-based polymers to improve dye uptake and fiber affinity.
The monomer also improves surface sizing performance in paper manufacturing. In the plastics and polymers sector, it is incorporated into acrylic and vinyl copolymers to enhance colloidal stability.
This improves electrolyte tolerance in emulsion systems during production. Leather processing also employs SMAS-derived polymers as retanning and dispersing agents for better results.
These agents improve the penetration and uniformity of treatment across the material. Sodium methallylsulfonate is typically supplied as a white crystalline powder or as an aqueous solution.
Standard concentrations are available, and the Technical grade is the primary commercial specification for industrial buyers. It is offered in bulk quantities suited to polymer manufacturing.
Packaging options range from bags to intermediate bulk containers to meet logistics needs. This versatile monomer remains a critical component for high-performance anionic polymer production.
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Physical Properties
| Melting Point | >300 °C(lit.) |
| Density | 1.59[at 20℃] |
| Color | White to Almost white |
| Form | powder to crystal |
| Water Solubility | 523g/L at 20℃ |
| Vapor Pressure | 0Pa at 20℃ |
| Log P | -3.74 at 20℃ |
Safety & Handling
Warning GHS07 Hazard Statements H315 Causes skin irritation H317 May cause an allergic skin reaction 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. P272 Contaminated work clothing should not be allowed out of the workplace. 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. P333+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 | 2904.10.5000 |
| Storage Class | 11 - Combustible Solids |
| WGK (Germany) | 1 |
Other Names
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Chemical Properties
- CAS Number
- 1561-92-8
- EC Number
- 216-341-5
- Mol. Weight
- 158.15
- HS Code
- 2904.10.5000
- Category
- Salts & Minerals