Tetra Methyl Ammonium Hydroxide Solution

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Tetra Methyl Ammonium Hydroxide Solution

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Tetra Methyl Ammonium Hydroxide Solution Specification

Application
Used as a developer in photolithography, electronics manufacturing, chemical synthesis

Solubility
Highly soluble in water

Structural Formula
N+(CH3)4 OH-

Molecular Formula
(CH3)4NOH

Density
0.98 Gram per cubic centimeter(g/cm3)

Ingredients
Tetra Methyl Ammonium Hydroxide, Water

HS Code
29211990

Appearance
Clear, colorless to pale yellow solution

Properties
Strong base, highly soluble in water, corrosive

Shelf Life
12 months

Smell
Ammoniacal

Refractive Rate
1.36

Molecular Weight
91.15 g/mol

Purity
25% (typical)

Shape
Liquid

Product Type
Chemical Compound

Usage
Etchant and developer in semiconductor fabrication

CAS No
75-59-2

EINECS No
200-882-9

Physical Form
Liquid

Melting Point
Not applicable (liquid)

Grade
Electronic Grade

Storage
Store tightly closed in cool, well-ventilated area away from acids

Ph Level
>13

Poisonous
YES

Boiling Point
~100°C (depends on water content)

Hazard Statements
H302, H314, H332

Auto-Ignition Temperature
Not flammable

pH (25% solution)
13.5

Regulatory Information
Compliant with international transport and hazard regulations

Packaging
HDPE carboys, drums, IBC tanks

Precautionary Statements
P260, P280, P305+P351+P338, P310

Decomposition Products
Decomposes to dimethylamine, methanol, and ammonia

Vapor Pressure
Approx. 24 mmHg at 20°C

Compatibility
Incompatible with acids and oxidizing agents

Viscosity
Approx. 1.05 mPa·s (25°C)

Tetra Methyl Ammonium Hydroxide Solution Trade Information

Main Export Market(s)
Australia, Central America, North America, South America, Western Europe, Middle East, Asia, Eastern Europe, Africa

Main Domestic Market
All India

About Tetra Methyl Ammonium Hydroxide Solution

Tetra Methyl Ammonium Hydroxide Solution (TMAH) is a chemical compound with the molecular formula (CH₃)4NOH. It is a colorless or slightly yellowish liquid that is highly soluble in water and organic solvents.

TMAH is a strong base and is commonly used as an etchant and developer in microfabrication processes in the semiconductor industry. It is also used in the production of polymers, surfactants, and detergents.

In the semiconductor industry, TMAH is used to selectively remove layers of materials such as silicon dioxide and silicon nitride from silicon wafers. It is also used as a developer in photolithography processes to remove exposed photoresist.

TMAH is also used in analytical chemistry as a solvent for the dissolution of various organic and inorganic compounds, and as a reagent for the determination of certain elements, such as boron and phosphorus.

While TMAH has many applications in various fields, it is important to handle it with care due to its high alkalinity and potential for skin and eye irritation. It should be used only in a well-ventilated area, and appropriate protective equipment should be worn when handling it.

FAQ

1. What is tetramethylammoniumhydroxide solution (TMAH)?

Ans - Tetra Methyl Ammonium Hydroxide Solution (TMAH) is a colourless, clear solution of the quaternary ammonium hydroxide chemical tetra methyl ammonium hydroxide. It is employed in the semiconductor sector as a chemical etchant.

2. What features does Tetra Methyl Ammonium Hydroxide Solution possess?

Ans - MAH has a 97 deg C boiling point and a 45°C flash point. It has good solubility in water, alcohols, and other organic solvents and is a potent base.

3. In what situations is tetramethylammoniumhydroxide solution used?

Ans - In the manufacture of semiconductors, TMAH is employed as an etchant. Additionally, it is employed in the creation of photoresists and the stripping of printed circuit boards of their nickel plating.

4. What safety measures should be taken when handling Tetra Methyl Ammonium Hydroxide Solution?

Ans - The answer is that TMAH is an irritant and should be handled carefully. It should be kept away from skin, eyes, and clothing because it is also quite corrosive.

5. Can you get Tetra Methyl Ammonium Hydroxide Solution in ready-to-use solutions?

Ans - Yes, TMAH is offered in a variety of pre-diluted, ready-to-use solutions that are appropriate for use in the semiconductor sector.

Key Properties and Composition

Tetra Methyl Ammonium Hydroxide Solution features high purity (25%), strong basicity (pH 13.5), and excellent water solubility. Its chemical structure is represented as N+(CH3)4 OH-, and it is supplied as a clear, colorless to slightly yellow liquid. This highly reactive solution is preferred in advanced electronics and photolithography for its consistency and reliability in process control.

Safe Handling and Storage

To ensure safety when handling TMAH, always use proper personal protective equipment such as gloves, eyewear, and respiratory protection where necessary. Store the solution in tightly-sealed HDPE containers in a cool, well-ventilated area, away from acids and oxidizing agents. Adherence to regulatory and precautionary statements is crucial for both workplace safety and environmental responsibility.

Applications in Electronics and Photolithography

TMAH is a vital component in the semiconductor industry, used as an etchant and developer during photolithography. Its consistent composition and potency contribute to precise microfabrication processes, making it indispensable for electronic device manufacturing, chemical synthesis, and related industrial applications.

FAQs of Tetra Methyl Ammonium Hydroxide Solution:

Q: How is Tetra Methyl Ammonium Hydroxide Solution typically used in the electronics industry?

A: TMAH solution is primarily employed as an etchant and photoresist developer during semiconductor fabrication, photolithography, and printed circuit board manufacturing. Its strong alkalinity enables precise pattern development on silicon wafers and other substrates.

Q: What precautions should be taken when handling Tetra Methyl Ammonium Hydroxide Solution?

A: Due to its corrosive and hazardous nature (hazard statements H302, H314, H332), always wear suitable protective gear including gloves, goggles, and lab coats. Work in a well-ventilated area, and avoid inhaling vapors or getting the solution on skin or eyes. Follow all precautionary statements (P260, P280, P305+P351+P338, P310).

Q: When should Tetra Methyl Ammonium Hydroxide Solution be stored or disposed of?

A: Store the solution tightly closed in an HDPE container, in a cool, well-ventilated place away from acids and oxidizers. Dispose of any unused or expired product (shelf life is 12 months) in accordance with local hazardous waste regulations to avoid environmental contamination.

Q: Where can Tetra Methyl Ammonium Hydroxide Solution be sourced?

A: TMAH solution is available from specialized chemical suppliers, exporters, and manufacturers in India and internationally. It is typically supplied in packaging such as HDPE carboys, drums, and IBC tanks to ensure safe and compliant transportation.

Q: What are the benefits of using electronic-grade Tetra Methyl Ammonium Hydroxide Solution?

A: Electronic-grade TMAH ensures high purity and consistency, which are critical for microfabrication and chemical synthesis processes. Its reliability furthers precision manufacturing, reduces defect rates, and enhances overall process efficiency.

Q: How does the chemical compatibility of TMAH affect process selection?

A: TMAH is incompatible with acids and oxidizing agents, as these can trigger hazardous reactions or decomposition. Ensuring chemical compatibility is essential during process design, equipment selection, and safe handling protocols.

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