Shandong Huashang Chemical Co., Ltd. is a high-tech enterprise focused on industry of fine chemicals research and develop, produce and sale. Shandong Huashang Chemical Co., Ltd. is located in Shan Dong Ji Nan China. we have the ability to provide you high quality products. More than 90 % of our products are exported to developed countries and regions such as north America, Europe, Japan, South Korea and the Middle East.
Octadecanedioic acid
1. Basic Information
Name: Octadecanedioic acid
Alias: 1,18-Octadecanedioic acid
CAS No.: 871-70-5
Molecular Formula: C18H34O4
Molecular Weight: 314.46
Category: Long-chain aliphatic dicarboxylic acid fine chemical monomer
2. Physical and Chemical Properties
Physical Properties
- Appearance: White waxy crystalline powder or flaky solid
- Odor: Odorless, faint fatty acid taste
- Solubility: Slightly soluble in hot ethanol, hot toluene and hot chloroform; insoluble in cold water, cold alcohols and aliphatic alkanes
- Melting Range: 124–128 °C
- Hygroscopy: Non-hygroscopic under normal ambient humidity
- Aqueous Property: Weakly acidic, extremely low solubility in water
Chemical Properties
- Molecular Structure: Straight-chain saturated alkane with carboxylic acid groups at both terminal carbons
- Carboxyl Reactivity: Two carboxyl groups can conduct esterification, amidation, salt formation, polycondensation reactions
- Thermal Stability: Stable below 120 °C; above melting point easy to oxidize and yellow under air heating; high temperature decarboxylation occurs
- Photostability: Moderately sensitive to strong UV light; long-term illumination causes slight oxidative discoloration
- Compatibility: Compatible with high-boiling organic solvents and polyol monomers; incompatible with strong alkaline substances and strong oxidants
3. Main Application Fields
1. Polyester & Polyamide Synthetic Monomer (Core Application)
Raw material for high-performance long-chain polyamides, biodegradable polyesters, hot melt adhesives and powder coatings; improves polymer flexibility, low-temperature resistance and waterproof performance
2. Lubricant & Grease Additive
Synthesis of high-temperature lubricants, metal rust inhibitors and ester-based synthetic lubricating oils
3. Cosmetic & Surfactant Intermediate
Precursor for mild long-chain anionic surfactants and skin care ester derivatives
4. HPLC Reference Standard
Reference substance for long-chain dicarboxylic acid purity detection
4. Quality Specification Table
| Test Item | Standard Specification |
| CAS Number | 871-70-5 |
| Molecular Formula | C18H34O4 |
| Appearance | Uniform white waxy flake without yellow impurities |
| HPLC Purity | Polymer Grade ≥99.0% |
| Acid Value | 350–360 mgKOH/g |
| Water Content (KF) | ≤0.20% |
| Melting Range | 124–128 °C |
| Residue on Ignition | ≤0.10% |
| Single Unknown Impurity | ≤0.10% |
| Heavy Metals (Pb) | ≤10 ppm |
| Packaging | 25kg PE lined fiber drum |
| Storage Condition | Hermetically sealed cool dry warehouse below 25 °C; isolated from light, alkaline chemicals and oxidants |
| Transportation Requirement | Common waxy solid, moisture-proof sealed packaging |
| Shelf Life | 36 months under intact sealed packaging |
Safety Warning
Mild irritant waxy solid. Dust irritates eyes, respiratory tract and skin; long-term skin contact may cause slight dryness and irritation. All operations shall be carried out in ventilated fume hoods with dust respirators and chemical-resistant gloves. Avoid mixing with strong alkali to prevent neutralization heat release. Waste liquid needs solvent recovery and neutralization treatment; solid waste belongs to general organic chemical waste and disposed by licensed hazardous waste institutions.
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