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.
Trimethyl phosphate
1. Basic Information
Name: Trimethyl phosphate
Alias: Phosphoric acid trimethyl ester
CAS No.: 512-56-1
Molecular Formula: C3H9O4P
Molecular Weight: 140.07
Category: Polar aprotic solvent, flame retardant additive, pharmaceutical synthesis solvent, lithium battery electrolyte additive, methylation reagent intermediate
2. Physical and Chemical Properties
Physical Properties
- Appearance: Colorless transparent oily liquid
- Odor: Mild faint ester odor
- Solubility: Fully miscible with water, methanol, ethanol, acetone, DMF; soluble in toluene; slightly soluble in alkane solvents
- Boiling Point: 193–196 ℃
- Density (20℃): 1.195–1.205 g/cm3
- Refractive Index nD20: 1.395–1.400
- Hygroscopy: Strongly hygroscopic, rapidly absorbs moisture from air
- Aqueous property: Neutral in neutral cold water; slow hydrolysis under heating, generates methanol and phosphoric acid
Chemical Properties
- Molecular structure: Triester of phosphoric acid with three methyl ester groups, high polarity and strong solvation ability
- Hydrolysis characteristic: Accelerated hydrolysis under acid/alkali heating, produces phosphoric acid and methanol
- Methylation activity: Can act as weak methyl donor for selective methylation in organic synthesis
- Flame retardant property: Decomposes at high temperature to form phosphorus-containing char layer, suppresses combustion
- Thermal stability: Stable below 150 ℃; above 200 ℃ decomposes and releases methyl alcohol vapor
- Photostability: Good light resistance, no discoloration under long-term light storage
- Compatibility: Compatible with most polar organic solvents; incompatible with strong alkaline solutions at high temperature, strong oxidants
3. Main Application Fields
1. High-polarity Synthesis Solvent (Core Application)
High-boiling inert solvent for fine chemical, pharmaceutical and pesticide synthesis, dissolves inorganic salts and polar organics
2. Flame Retardant Auxiliary
Additive for polyurethane, epoxy resin, plastic to improve flame retardancy and reduce smoke emission
3. Lithium Battery Electrolyte Additive
Improves electrolyte film-forming performance, enhances battery cycle stability
4. Organic Methylation Reagent
Mild methylating agent for lab intermediate synthesis, alternative to toxic methyl halides
4. Quality Specification Table
| Test Item | Standard Specification |
| CAS Number | 512-56-1 |
| Molecular Formula | C3H9O4P |
| Appearance | Colorless clear oily liquid without suspended matter |
| GC Purity | Industrial Grade ≥99.0%, Electronic Grade ≥99.5% |
| Water Content (KF) | ≤0.10% |
| Chroma (APHA) | ≤20 |
| Acid Value | ≤0.1 mgKOH/g |
| Heavy Metals (Pb) | ≤10 ppm |
| Packaging | Nitrogen-sealed amber glass bottle; bulk 200kg galvanized iron drum |
| Storage Condition | Hermetically sealed cool dry warehouse below 25 ℃, full air isolation to prevent moisture absorption, separate from strong alkali |
| Transportation Requirement | Strongly hygroscopic polar phosphate liquid, sealed moisture-proof packaging, away from food and corrosive chemicals |
| Shelf Life | 24 months under nitrogen sealed storage |
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