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.
Terephthalic Acid
1. Basic Product Information
Product Name: Terephthalic Acid
Abbreviation: PTA
CAS Number: 100-21-0
Molecular Formula: C?H?O?
Molecular Weight: 166.13
Synonyms: Benzene-1,4-dicarboxylic acid, p-Phthalic acid
Product Category: Bulk organic chemical, polyester monomer, plastic raw material, coating intermediate
2. Physical and Chemical Properties
Physical Indicators
- Appearance: White crystalline powder
- Odor: Odorless
- Solubility: Insoluble in cold water, slightly soluble in hot water; soluble in alkaline aqueous solution, dimethyl sulfoxide; barely soluble in ethanol, ether, benzene
- Melting Point: Sublimes at 300°C without distinct melting point under normal pressure
- Density (20°C): 1.52 g/cm3
- Hygroscopicity: Non-hygroscopic under sealed dry storage
- Aqueous Stability: Stable in neutral water; reacts with alkalis to form soluble terephthalate salts
Chemical Characteristics
- Molecular Structure: Benzene ring with two carboxyl groups at para positions, symmetric aromatic dicarboxylic acid
- Core Reactivity: Undergoes esterification with ethylene glycol, butanediol to produce PET, PBT and other polyester resins via polycondensation
- Thermal Performance: Sublimes above 230°C; high thermal stability without decomposition below 280°C
- Photostability: Excellent light stability, no discoloration under long-term UV exposure
- Chemical Compatibility: Compatible with glycol monomers and neutral solvents; incompatible with strong oxidants, concentrated strong acids and heavy metal ions
3. Main Application Fields
- Core Application: Polyester Raw Material
Main monomer for polyethylene terephthalate (PET), used to produce polyester fiber, plastic bottles, film and engineering plastic parts - Coating & Paint Intermediate
Raw material for high-temperature resistant polyester coatings, powder coatings and water-based industrial paints - Plasticizer & Resin Synthetic Reagent
Building block for unsaturated polyester resin, polyurethane resin and adhesive synthesis - Laboratory Organic Chemistry Standard
Reference substance for aromatic dicarboxylic acid synthesis and polymer material research
4. Platform Category & Product Group Selection Guide
1) Domestic B2B Platform Category
Recommended Path: Organic Intermediates / Organic Intermediates
Reason: Large-volume industrial aromatic dicarboxylic acid monomer for polymer manufacturing
2) English Product Group Dropdown Options
Recommended Selection: Basic Organic Chemicals
Do NOT select Pharmaceutical Chemicals; it is bulk industrial polymer raw material rather than pharmaceutical API
3. Standard Foreign Trade Packaging Specification
1kg sealed plastic bag for lab test samples; 25kg woven bag lined with PE inner bag for bulk industrial orders; customized bulk jumbo bag packaging available
5. Quality Specification Table
| Test Item | Standard Requirement |
| CAS Number | 100-21-0 |
| Molecular Formula | C?H?O? |
| Appearance | Uniform white crystalline powder without colored impurities |
| Purity | Industrial Grade ≥99.90% |
| Moisture Content | ≤0.10% |
| 4-Carboxybenzaldehyde (4-CBA) | ≤25 ppm |
| p-Toluic Acid | ≤150 ppm |
| Heavy Metals (Pb) | ≤10 ppm |
| Standard Storage Package | Sealed woven bag with PE inner liner, 25kg net weight |
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