Tetramethylammonium hydroxide pentahydrate
- CAS Number
- 10424-65-4
- HSN Code
- 29239000
- Molecular Formula
- (CH3)4N(OH)·5H2O
- Catalogue Number
- AL2572A
- Purity
- ≥98%
- Molecular Weight
- 181.23 g/mol
Complies with : IP | BP | USP | EP | ACS
ISO 9001
ISO 14001
GMP
COA with every batch
Key Properties
Tetramethylammonium hydroxide (TMAH) is a strong quaternary ammonium base that is widely recognized for its applications in semiconductor etching and organic synthesis. This extra pure grade, with a purity of 98%, is particularly valued in high-precision environments where contamination must be minimized. TMAH is known for its ability to act as a strong base and a phase-transfer catalyst, facilitating various chemical reactions. Its unique properties make it an essential reagent in the microelectronics industry, particularly in the fabrication of integrated circuits.
Also known as TMAH, Tetramethylammonium hydroxide.
- Catalogue No.
- AL2572A
- CAS Number
- 10424-65-4
- Molecular Formula
- (CH3)4N(OH)·5H2O
- Molecular Weight
- 181.23 g/mol
- HSN Code
- 29239000
- Grade
- Extra Pure
- Product Form
- Substance
Tetramethylammonium hydroxide appears as a white crystalline solid that is hygroscopic in nature, meaning it readily absorbs moisture from the air. It has a melting point of approximately 50 °C and is highly soluble in water, forming a clear solution. The density of TMAH is around 1.1 g/cm³, and it has a boiling point of approximately 100 °C when dissolved in water. The compound is characterized by a strong ammonia-like odor, which is typical of quaternary ammonium compounds.
- Appearance
- White crystalline solid
- Shelf Life
- 2 years
- Packaging
- Available in 500 g and 1 kg bottles
- Storage
- Store at 2-8°C, in a tightly sealed container away from moisture.
1.1 — Product identifier
- Chemical Name
- Tetramethylammonium hydroxide pentahydrate
- Catalogue No.
- AL2572A
- Product form
- Substance
- CAS Number
- 10424-65-4
- EC Number
- 233-148-4
- Grade
- Extra Pure
- EC Index Number
- 612-002-00-4
- Chemical Formula
- (CH3)4N(OH)·5H2O
- HSN Code
- 29239000
- Synonyms
- TMAH, Tetramethylammonium hydroxide
1.2 — Relevant identified uses of the substance or mixture and uses advised against
- Use of the substance/mixture
- Used as a strong base and etchant in semiconductor manufacturing and as a phase-transfer catalyst in organic synthesis.
- Uses advised against
- Not specified
1.3 — Details of the supplier of the safety data sheet
- Company identification
- Address:- 102, B wing, Savgan Heights, RTO Lane,Andheri (W), Mumbai-400 053Maharashtra, India.
1.4 — Emergency Contact Details
- Phone / e-Mail
- Phone : +91 22 26317055 Mobile : +91 9820385757 e-mail : info@alphachemika.co.in
2.3 — Other hazards
- Other hazards
- Corrosive to metals; may cause severe skin burns and eye damage.
3.1 — Substance
- Name
- Tetramethylammonium hydroxide pentahydrate
- CAS No.
- 10424-65-4
4.1 — Description of first aid measures
- First-aid measures after inhalation
- Move to fresh air. If breathing is difficult, give oxygen. Seek medical attention immediately.
- First-aid measures after skin contact
- Remove contaminated clothing and rinse skin with plenty of water for at least 15 minutes. Seek medical attention if irritation persists.
- First-aid measures after eye contact
- Rinse cautiously with water for several minutes. Remove contact lenses if present and easy to do. Continue rinsing and seek medical attention.
- First-aid measures after ingestion
- Do not induce vomiting. Rinse mouth and seek medical attention immediately.
4.2 — Most important symptoms and effects, both acute and delayed
- Symptoms relating to use
- Symptoms of exposure may include irritation of the respiratory tract, skin burns, and eye damage.
4.3 — Indication of any immediate medical attention and special treatment needed
- General information
- Treat symptomatically. Show this safety data sheet to the treating physician.
5.1 — Extinguishing media
- Suitable extinguishing media
- Water spray, carbon dioxide, dry chemical powder, foam.
- Unsuitable extinguishing media
- Not specified
5.2 — Special hazards arising from the substance or mixture
- Special procedures
- May emit toxic fumes under fire conditions. Use water spray to cool containers exposed to fire.
5.3 — Advice for firefighters
- Protection during firefighting
- Do not enter fire area without proper protective equipment, including respiratory protection.
6.1.1 — For non-emergency personnel
- Emergency procedures
- Evacuate area and ventilate. Wear appropriate protective equipment. Contain spill and absorb with inert material.
6.3 — Methods and material for containment and cleaning up
- Methods for cleaning up
- Collect and dispose of in accordance with local regulations. Neutralize with dilute acid if necessary.
6.4 — Reference to other sections
- Reference
- Not specified
7.1 — Precautions for safe handling
- Precautions for safe handling
- Handle with care, using appropriate personal protective equipment (PPE) including gloves and goggles. Avoid contact with skin and eyes.
- Hygiene measures
- Wash hands and other exposed areas with mild soap and water before eating, drinking or smoking and when leaving work.
7.2 — Conditions for safe storage, including any incompatibilities
- Storage conditions
- Store in a cool, dry place, away from incompatible materials such as strong acids and oxidizers.
8.2 — Exposure controls
- Hand protection
- Protective gloves (e.g. nitrile rubber)
- Eye protection
- Chemical safety goggles or safety glasses
- Skin and body protection
- Wear suitable protective clothing
- Respiratory protection
- Use a NIOSH-approved respirator if exposure limits are exceeded or if irritation occurs.
9.1 — Information on basic physical and chemical properties
- Physical state
- Solid
- Colour
- White
- Odour
- Ammonia-like
- Odour threshold
- Not specified
- pH value
- >13 (in solution)
- Relative evaporation rate (butylacetate=1)
- Not specified
- Melting point
- 50 °C
- Freezing point
- Not specified
- Boiling point
- 100 °C (in solution)
- Flash point
- Not applicable
- Auto-ignition temperature
- Not applicable
- Decomposition temperature
- Not specified
- Flammability (solid, gas)
- Not flammable
- Vapour pressure
- Not specified
- Relative vapour density at 20°C
- Not specified
- Density
- 1.1 g/cm³
- Solubility
- Soluble in water
- Log Pow
- Not specified
- Viscosity, kinematic
- Not specified
- Viscosity, dynamic
- Not specified
- Explosive properties
- Not explosive
- Oxidising properties
- Not oxidizing
- Explosive limits
- Not applicable
10.1 — Reactivity
- Reactivity
- Stable under normal conditions. Reacts violently with strong acids and oxidizing agents.
10.2 — Chemical stability
- Chemical stability
- Stable under recommended storage conditions.
10.3 — Possibility of hazardous reactions
- Possibility of hazardous reactions
- No dangerous reactions known under normal conditions of use.
10.4 — Conditions to avoid
- Conditions to avoid
- Avoid contact with incompatible materials and excessive heat.
10.5 — Incompatible materials
- Incompatible materials
- Strong acids, strong oxidizers, and moisture.
10.6 — Hazardous decomposition products
- Hazardous decomposition products
- Not specified
11.1 — Information on toxicological effects
- Acute toxicity
- Toxic if swallowed, inhaled, or absorbed through skin.
- Skin corrosion/irritation
- Causes severe skin burns.
- Serious eye damage/irritation
- Causes serious eye damage.
- Respiratory or skin sensitisation
- Not a skin sensitizer.
- Germ cell mutagenicity
- Not classified
- Carcinogenicity
- Not classified
- Specific target organ toxicity (single exposure)
- May cause respiratory irritation.
- Specific target organ toxicity (repeated exposure)
- Not classified
12.1 — Toxicity
- Toxicity information
- Not specified
12.2 — Persistence - degradability
- Persistence - degradability
- Not specified
12.3 — Bioaccumulative potential
- Bioaccumulative potential
- Not specified
12.4 — Mobility in soil
- Mobility in soil
- Not specified
12.6 — Other adverse effects
- Environmental precautions
- Not specified
13.1 — Waste treatment methods
- Additional Info
- Dispose of contents/container in accordance with local, regional, national and international regulations.
14.1 — UN number
- UN-No. (ADR)
- UN 3423
- UN-No. (IMDG)
- UN 3423
- UN-No. (IATA)
- UN 3423
- UN-No. (ADN)
- UN 3423
- UN-No. (RID)
- UN 3423
14.2 — UN proper shipping name
- Proper Shipping Name (ADR)
- Tetramethylammonium hydroxide, solution
- Proper Shipping Name (IMDG)
- Tetramethylammonium hydroxide, solution
- Proper Shipping Name (IATA)
- Tetramethylammonium hydroxide, solution
- Proper Shipping Name (ADN)
- Tetramethylammonium hydroxide, solution
- Proper Shipping Name (RID)
- Tetramethylammonium hydroxide, solution
14.3 — Transport hazard class(es)
- Transport hazard class(es)
- 8
14.4 — Packing group
- Packing group (ADR)
- II
- Packing group (IMDG)
- II
- Packing group (IATA)
- II
- Packing group (ADN)
- II
- Packing group (RID)
- II
14.5 — Environmental hazards
- Dangerous for the environment
- Not specified
- Marine pollutant
- Not specified
- Other information
- No supplementary information available
15.1 — Safety, health and environmental regulations/legislation specific for the substance or mixture
- 15.1.1 EU-Regulations
- Not specified
Tetramethylammonium hydroxide is primarily used in the semiconductor industry as a strong base etchant, particularly in the photolithography process for microfabrication. It is also employed as a phase-transfer catalyst in organic synthesis, facilitating the transfer of reactants between immiscible phases. Additionally, TMAH is utilized in the production of various chemical intermediates and in the formulation of cleaning agents for electronic components. Its role in enhancing reaction rates and selectivity makes it a valuable reagent in both academic and industrial laboratories.
ISO 9001
ISO 14001
GMP
COA with every batch
- Batch Number
- AL-2026-AL2572A
- Manufacturing Date
- September-2026
- Expiry Date
- September-2031
- Molecular Weight
- 181.23 g/mol
| Test | Standard | Observed |
|---|---|---|
| Assay | ≥98% | 99.5% |
| Moisture Content | ≤2% | 1.5% |
| Residue on Ignition | ≤0.5% | 0.2% |
| Related Substances | None detected | None detected |
| Solubility | Soluble in water | Fully soluble |
The above product is expected to comply with Extra Pure grade specification.
Technical Data Sheet
| Grade | Assay/Purity | Melting/Boiling Point | Moisture/LOD | Residue on Ignition | Related Substances | Solubility |
|---|---|---|---|---|---|---|
| 98% Extra Pure | ≥98% | 50 °C (melting) | ≤2% | ≤0.5% | None detected | Soluble in water |
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