Description
Specifications Table
Product Name – Tetramethylammonium hydroxide, 25 wt% in methanol
Quantity/Pack Size – 100GR, 500GR
Form – Liquid
Grade – Reagent
Application – Semiconductor processing, organic synthesis, alkaline reagent
Product Overview
Tetramethylammonium hydroxide (TMAH), supplied as a 25 wt% solution in methanol, is a high-purity quaternary ammonium base widely used in laboratory and industrial applications. This reagent-grade solution offers strong alkalinity without metal ion contamination, making it ideal for sensitive processes like photoresist development in semiconductor fabrication. The methanol solvent enhances solubility and reactivity, ensuring consistent performance in organic synthesis, where it acts as a non-nucleophilic base for deprotonation reactions. Its stability and low volatility compared to aqueous solutions provide precise control in analytical and preparative chemistry. The solution is hygroscopic, requiring proper storage to maintain concentration and purity. Compatible with most glass and plastic labware, it is a safer alternative to potassium hydroxide in applications requiring a strong, non-metallic base. The 25% concentration balances reactivity with ease of handling, reducing the need for dilution in most protocols.
FAQs
1. What is the shelf life of tetramethylammonium hydroxide in methanol?
When stored unopened in a cool, dry place away from moisture, the solution remains stable for 24 months from the date of manufacture. Exposure to air or humidity may lead to gradual degradation over time.
2. Can this solution be used for silicon wafer etching?
Yes, 25% TMAH in methanol is commonly used as an anisotropic etchant for silicon wafers, particularly in microfabrication processes where precise control over etch rates is required.
3. What safety precautions should be taken while handling this chemical?
Wear nitrile gloves, safety goggles, and a lab coat when handling. Work in a well-ventilated area or fume hood, as methanol vapors are flammable and the solution is corrosive to skin and eyes.
4. Is this solution compatible with plastic containers?
The solution is compatible with HDPE and PTFE containers. Avoid prolonged storage in standard polyethylene or polypropylene containers, as methanol may cause swelling or degradation over time.
5. How does this compare to aqueous TMAH solutions?
Methanol-based TMAH offers lower freezing points and reduced water content, which is beneficial for applications sensitive to moisture. It also provides better solubility for organic compounds compared to aqueous solutions.
