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CAS 81-64-1 1,4-Dihydroxyanthraquinone
Overview
1,4-Dihydroxyanthraquinone (also known as Alizarin; CAS 82-66-6; C₁₄H₈O₃)Shandong Yinglang Chemical CO., LTD, a manufacturer of fine chemicals, supplies 1,4-Dihydroxyanthraquinone as a high-purity crystalline powder suitable for use in industrial-scale dyeing processes, syntheses of dyes and pigments, and specialty applications.
Product Description
81-64-1 1,4-Dihydroxyanthraquinone
Shandong Yinglang Chemical CO., LTD, a manufacturer of fine chemicals, supplies 1,4-Dihydroxyanthraquinone as a high-purity crystalline powder suitable for use in industrial-scale dyeing processes, syntheses of dyes and pigments, and specialty applications. The product is available in bulk or lab-grade quantities, with COA/TDS/SDS documentation and custom packaging options on request. Store tightly closed, cool and dry, protected from light and moisture.
1,4-Dihydroxyanthraquinone (Quinizarin) — Product Specification
CAS: 81-64-1 | Formula: C14H8O4 | Molecular weight: 240.21 g/mol | Synonyms: Quinizarin; 1,4-Dihydroxy-9,10-anthraquinone | Function: Hydroxyanthraquinone dye intermediate / colorant
Identity & Form
| Appearance | Violet to dark-violet crystalline powder |
|---|---|
| Solubility | Insoluble in water; soluble in ethanol, DMF, DMSO, chlorobenzene; soluble in alkaline solutions (phenolate) |
| End-use platforms | Disperse dyes for polyester/acetate; plastics & masterbatch; printing inks and coatings |
| Documents | COA · TDS · SDS |
Typical Specification (example)
| Assay (HPLC, main component) | ≥ 98.0% (w/w) |
|---|---|
| Color strength (vs internal std.) | 100% ± 3% |
| Shade difference (ΔE*, CIELab) | ≤ 1.0 (against standard) |
| Melting point | 198 – 202 °C |
| Loss on drying (105 °C) | ≤ 1.0% |
| Total ash | ≤ 0.50% |
| Residue on 45 μm sieve | ≤ 0.10% |
| Particle size (laser) | D90 ≤ 1.0 μm (custom milling available) |
| Insoluble in xylene (2% slurry) | ≤ 0.50% |
| Organic impurities (HPLC) | Total ≤ 1.0% |
| Heavy metals (as Pb) | ≤ 10 ppm |
| Appearance (QC) | Free-flowing; no visible foreign matter |
Application Performance (typical)
| Sublimation / migration on PET | Good resistance (see COA) |
|---|---|
| Heat stability | High; suitable for polyester dyeing and polymer coloration |
| Lightfastness | Good for hydroxyanthraquinone class (substrate/process dependent) |
Applications & Handling
| Main uses | Disperse dyeing/printing (polyester/acetate); plastics masterbatch; solvent/disperse inks & coatings |
|---|---|
| Processing | Fine milling (≈0.2–1 μm) with nonionic/anionic dispersants to build stable dispersions for padding/exhaust/printing |
| Handling | Handle dust as irritant; avoid strong oxidizers/reductants and excessive heat; ensure PPE/ventilation |
| Storage | Keep tightly closed, cool and dry; protect from light and moisture |
Packaging & Logistics
| Packaging | 10–25 kg fiber drums or multilayer bags (inner PE liner); custom OEM/milling on request |
|---|---|
| Ports | Qingdao · Shanghai · Tianjin |
| To quote (please specify) | Target assay/strength/shade, particle size, pack size, destination country/port, and documentation |
© Shandong Yinglang Chemical CO.,LTD · Information for B2B technical marketing only.
PACKING AND DELIVERY
Packing and delivery
We offer secure and compliant packaging for a wide range of chemical products, from laboratory bottles (100 mL, 250 mL, 500 mL) to customized bulk containers. All shipments follow international hazardous goods standards and include complete documentation such as COA and SDS. With reliable global logistics partners, we ensure safe, fast, and efficient delivery by air, sea, or land according to customer needs.