Overview
Benzyltrimethylammonium chloride (CAS 56-93-9 ), commonly abbreviated as BTMAC or TMBAC, is a quaternary ammonium salt used across chemical synthesis, preservation, and formulation applications.
It functions primarily as a phase-transfer catalyst and antimicrobial agent, enabling efficient reaction conditions and broad-spectrum biocidal activity in various industrial processes.
In pharmaceutical and fine chemical manufacturing, BTMAC accelerates reactions between aqueous and organic phases, reducing processing time and improving yields in API synthesis.
Personal care and cosmetic formulators incorporate it as a preservative and conditioning agent in rinse-off and leave-on products to ensure product stability and safety.
Agricultural formulations use it as a biocidal active or adjuvant to enhance the efficacy of crop protection products, while biotechnology sectors use it for cell disruption.
It serves as a reagent in nucleic acid extraction workflows and is supplied as a white to off-white crystalline powder or as an aqueous solution at various concentrations.
Standard commercial grades include technical and pharmaceutical-grade material, with purity levels typically ranging from 97% to 99%+ for synthesis and regulated applications.
Packaging options range from kilogram-scale laboratory quantities to bulk industrial supply, ensuring flexibility for both research and large-scale manufacturing needs.
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Physical Properties
| Melting Point | 243 °C |
| Boiling Point | 305.52°C (rough estimate) |
| Density | 1.07 g/cm³ @ Temp: 20 °C |
| Appearance | white to light yellow crystal powde |
| Color | White to ivory |
| Odor | Faint, almond like odor |
| Form | Crystalline Powder or Chunks |
| Water Solubility | 800 g/L |
| Vapor Pressure | <0.0001 hPa (20 °C) |
| Refractive Index | n 20/D 1.479 |
| pH | 6-8 (100g/l, H2O, 20℃) |
Safety & Handling
Danger GHS06 GHS07 GHS08 GHS09 Hazard Statements H301 Toxic if swallowed H311 Toxic in contact with skin H315 Causes skin irritation H319 Causes serious eye irritation H332 Harmful if inhaled H341 Suspected of causing genetic defects H370 Causes damage to organs H371 May cause damage to organs H373 May causes damage to organs through prolonged or repeated exposure H412 Harmful to aquatic life with long lasting effects H301+H311 Toxic if swallowed or in contact with skin Precautionary Statements P203 Obtain, consult and follow expert instructions for use. P260 Do not breathe dust/fume/gas/mist/vapours/spray. P261 Avoid breathing dust/fume/gas/mist/vapours/spray. P262 Do not get in eyes, on skin, or on clothing. P264 Wash … thoroughly after handling. P270 Do not eat, drink or smoke when using this product. P271 Use only outdoors or in a well-ventilated area. P273 Avoid release to the environment. P280 Wear protective gloves/protective clothing/eye protection/face protection. P316 Get emergency medical help immediately. P317 Get emergency medical help. P318 IF exposed or concerned, get medical advice. P319 Get medical advice/attention if you feel unwell. P321 Specific treatment (see … on this label). P330 Rinse mouth. P405 Store locked up. P501 Dispose of contents/container in accordance with local regulations. P264+P265 Wash … thoroughly after handling. P301+P316 Get emergency medical help immediately. P302+P352 IF ON SKIN: Wash with plenty of water. P304+P340 IF INHALED: Remove person to fresh air and keep comfortable for breathing. P308+P316 Get emergency medical help immediately. P332+P317 Get emergency medical help. P337+P317 If eye irritation persists: Get medical advice/attention. Get emergency medical help. P361+P364 Take off immediately all contaminated clothing and wash it before reuse. P362+P364 Take off contaminated clothing and wash it before reuse. P305+P351+P338 IF IN EYES: Rinse cautiously with water for several minutes. Remove contact lenses, if present and easy to do. Continue rinsing.
Trade & Regulatory
| HS Code | 29239000 |
| UN Number | 2811 |
| ADR Class | 6.1 |
| Packing Group | III |
| Storage Class | 6.1D - Non-combustible acute toxic Cat.3 toxic hazardous materials or hazardous materials causing chronic effects |
| WGK (Germany) | 3 |
Other Names
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Chemical Properties
- CAS Number
- 56-93-9
- EC Number
- 200-300-3
- Mol. Weight
- 185.69
- HS Code
- 29239000
- Category
- Salts & Minerals