Overview
Stearyl acrylate (CAS 4813-57-4 ), also known commercially as octadecyl acrylate, is a long-chain alkyl ester monomer used to introduce hydrophobic character and flexibility into polymer systems.
Its C18 fatty chain makes it a practical building block for tailoring surface properties, film formation, and lubricity in finished materials. In coatings and adhesives, it is copolymerized with acrylic monomers.
This process improves water resistance, substrate adhesion, and low-temperature flexibility in pressure-sensitive and structural formulations. Personal care formulators incorporate it into film-forming polymers for hair fixatives.
It is also utilized for skin-feel modifiers and water-repellent emulsion systems. In lubricant additive chemistry, polymerized stearyl acrylate contributes to viscosity modification and boundary lubrication performance.
These applications are vital in metalworking and industrial fluids. It also functions as a surface-modifying comonomer in specialty plastics and elastomers where controlled hydrophobicity is required.
The material is effective for applications needing reduced surface energy. Stearyl acrylate is supplied as a low-melting solid or liquid depending on temperature, typically available in technical and monomer grades.
Inhibited grades containing polymerization inhibitors such as MEHQ are standard for safe storage and transport. Bulk and drum packaging are the common supply formats for industrial buyers globally.
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Physical Properties
| Melting Point | 32 °C |
| Boiling Point | 402.85°C (rough estimate) |
| Density | 0.9167 g/cm³ (solid) @ Temp: 25 °C |
| Flash Point | >230 °F |
| Color | White or Colorless to Almost white or Almost colorless |
| Form | powder to lump to clear liquid |
| Water Solubility | 260.9ng/L at 25℃ |
| Vapor Pressure | 0.001Pa at 25℃ |
| Refractive Index | 1.5344 (estimate) |
| Log P | 9.08 at 25℃ |
Safety & Handling
Warning GHS07 GHS09 Hazard Statements H315 Causes skin irritation H317 May cause an allergic skin reaction H319 Causes serious eye irritation H335 May cause respiratory irritation H411 Toxic to aquatic life with long lasting effects 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. P273 Avoid release to the environment. 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). P391 Collect spillage. 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 | 29161290 |
| UN Number | 3077 |
| ADR Class | 9 |
| Packing Group | III |
| Storage Class | 11 - Combustible Solids |
| WGK (Germany) | 2 |
Other Names
Related Products
Chemical Properties
- CAS Number
- 4813-57-4
- EC Number
- 225-383-3
- Mol. Weight
- 324.5
- HS Code
- 29161290
- Category
- Monomers & Building Blocks