Overview
Octadecanedioic acid (CAS 871-70-5 ) is a long-chain dicarboxylic acid used as a functional building block and performance additive across lubricant, coating, and personal care formulations.
Its symmetrical 18-carbon diacid structure enables surface modification, emulsification, and lubrication functions that shorter-chain diacids cannot match in industrial applications.
In lubricant and metalworking fluids, it acts as a friction modifier and corrosion inhibitor, improving film persistence on metal surfaces under load for better performance.
Coating and adhesive formulators incorporate it into polyamide and polyester resins to enhance flexibility, adhesion, and substrate wetting in various industrial finishes and protective layers.
Personal care manufacturers use it to modify emulsion texture and improve spreadability in skin-conditioning products, providing a smooth and consistent application for the end user.
Sealant and elastomer compounders also source it as a chain extender or crosslinking co-monomer to tune mechanical properties in specialty polymer systems and high-performance materials.
Octadecanedioic acid is supplied as a white to off-white powder or flake. Technical grade is the standard commercial form for industrial applications including lubricants and coatings.
Higher-purity grades are available for personal care and cosmetic formulations where tighter specification control is required to meet the rigorous demands of the beauty industry.
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Physical Properties
| Melting Point | 122-123 °C |
| Boiling Point | 480.9±18.0 °C(Predicted) |
| Density | 0.998±0.06 g/cm3(Predicted) |
| Color | White to Almost white |
| Form | Liquid |
| Water Solubility | 148.5μg/L at 25℃ |
| Vapor Pressure | 0Pa at 25℃ |
| Refractive Index | 1.486 |
| Log P | 6.121 |
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 | 38231100 |
Other Names
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Chemical Properties
- CAS Number
- 871-70-5
- EC Number
- 617-978-5
- Mol. Weight
- 314.5
- HS Code
- 38231100
- Category
- Organic Acids