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.
1,4-Dihydroxyanthraquinone
1. Basic Information
Name: 1,4-Dihydroxyanthraquinone
Alias: Quinizarin, 1,4-Anthraquinonediol
CAS No.: 81-64-1
Molecular Formula: C14H8O4
Molecular Weight: 240.21
Category: Anthraquinone dye intermediate, solvent dye raw material, colorant for plastics/resins, analytical reagent, fluorescent dye precursor
2. Physical and Chemical Properties
Physical Properties
- Appearance: Orange-red to red crystalline powder
- Odor: Odorless
- Solubility: Soluble in ethanol, acetone, toluene, DMF, alkaline aqueous solution; slightly soluble in hot water; insoluble in cold water, aliphatic hydrocarbons
- Melting Point: 198–202 °C
- Predicted Density: 1.47 g/cm3
- Hygroscopy: Non-hygroscopic under sealed normal storage
- Aqueous property: Weakly acidic phenolic compound; dissolves in strong alkali to form purple-red phenoxide solution
Chemical Properties
- Molecular structure: Anthraquinone parent ring with two hydroxyl groups substituted at C1 and C4 positions, conjugated large π system with strong color development ability
- Dye synthesis reactivity: Phenolic hydroxyl groups undergo alkylation, esterification, amination and halogenation to produce solvent red, disperse red, oil-soluble anthraquinone dyes
- pH color change: Displays orange-red in neutral medium; turns purple-red in alkaline environment; fades under strong acid conditions
- Photostability: Good light resistance; long-term UV irradiation only slight color fading
- Thermal stability: Stable below 180 °C; above melting point, high-temperature heating sublimates and slowly decomposes to produce carbon oxide fumes
- Compatibility: Compatible with most resin monomers, oil solvents and alkaline dyeing systems; incompatible with strong oxidants under heating
3. Main Application Fields
1. Anthraquinone Dye Core Intermediate (Core Application)
Key raw material for manufacturing disperse red dyes, solvent red dyes, oil-soluble colorants for plastic, wax, printing ink
2. Polymer & Resin Colorant
Transparent red coloring agent for polyester, nylon, PVC, epoxy resin, masterbatch, high-temperature resistant plastic coloring
3. Laboratory Analytical Reagent
pH indicator, metal ion chelating chromogenic reagent for qualitative detection of aluminum, magnesium ions
4. Fluorescent & Functional Pigment Precursor
Synthetic raw material for fluorescent dyes used in optical brighteners and laser dyes
4. Quality Specification Table
| Test Item | Standard Specification |
| CAS Number | 81-64-1 |
| Molecular Formula | C14H8O4 |
| Appearance | Uniform orange-red crystalline powder without dark impurities |
| HPLC Purity | Dye Industrial Grade ≥98.5%, Reagent Grade ≥99.0% |
| Melting Point | 198–202 °C |
| Water Content (KF) | ≤0.20% |
| Single Unknown Impurity | ≤0.10% |
| Ash Content | ≤0.05% |
| Heavy Metals (Pb) | ≤10 ppm |
| Packaging | Light-proof aluminum foil vacuum bag; bulk 25kg PE lined fiber drum |
| Storage Condition | Hermetically sealed cool dry warehouse below 25 °C, light shielding, isolated from oxidants and strong alkaline substances |
| Transportation Requirement | Stable aromatic pigment powder, general chemical transport standard, avoid damp stacking |
| Shelf Life | 24 months under intact sealed packaging |
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