Tetramethylammonium hydroxide solution
- CAS Number
- -
- HSN Code
- 38229090
- Molecular Formula
- (CH3)4N(OH)
- Catalogue Number
- AL2572G
- Purity
- 25%
- Molecular Weight
- 91.15 g/mol
Complies with : IP | BP | USP | EP | ACS
ISO 9001
ISO 14001
GMP
COA with every batch
Key Properties
Tetramethylammonium hydroxide solution 25% in water is a concentrated aqueous preparation that serves as a strong base for various demanding synthesis applications. This solution is particularly notable for its utility in semiconductor etching processes and organic synthesis research, where precise control of pH and reactivity is essential. The compound is a quaternary ammonium hydroxide, which contributes to its strong basicity and reactivity. Its formulation as a 25% solution allows for ease of handling and application in laboratory settings.
Also known as TMAH, Tetramethylammonium hydroxide.
- Catalogue No.
- AL2572G
- CAS Number
- -
- Molecular Formula
- (CH3)4N(OH)
- Molecular Weight
- 91.15 g/mol
- HSN Code
- 38229090
- Grade
- 25% solution in water
- Product Form
- Mixture
The product appears as a clear, colorless liquid, indicative of its high purity and concentration. It has a density of approximately 0.9 g/cm³, which is typical for aqueous solutions of quaternary ammonium compounds. The boiling point of tetramethylammonium hydroxide solution is around 100 °C, while it has a freezing point of approximately -10 °C. This solution is highly soluble in water, making it suitable for various aqueous applications. The pH of the solution is typically around 13, reflecting its strong basic nature.
- Appearance
- Clear, colorless liquid
- Shelf Life
- 12 months
- Packaging
- Available in 1L and 5L HDPE bottles
- Storage
- Store in a cool, dry place away from incompatible materials.
1.1 — Product identifier
- Chemical Name
- Tetramethylammonium hydroxide solution
- Catalogue No.
- AL2572G
- Product form
- Mixture
- CAS Number
- Not applicable
- EC Number
- 200-898-2
- Grade
- 25% solution in water
- EC Index Number
- 611-002-00-0
- Chemical Formula
- (CH3)4N(OH)
- HSN Code
- 38229090
- Synonyms
- TMAH, Tetramethylammonium hydroxide
1.2 — Relevant identified uses of the substance or mixture and uses advised against
- Use of the substance/mixture
- Strong base reagent for etching and 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 solution
- CAS No.
- Not applicable
4.1 — Description of first aid measures
- First-aid measures after inhalation
- Move to fresh air. If symptoms persist, seek medical attention.
- 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 develops.
- 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
- Burning sensation, respiratory distress, skin irritation, 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
- Non-flammable, but may react with water to release heat.
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
- Contain spill and neutralize with dilute acid. Wear appropriate PPE during cleanup.
6.3 — Methods and material for containment and cleaning up
- Methods for cleaning up
- Absorb spill with inert material and dispose of in accordance with local regulations.
6.4 — Reference to other sections
- Reference
- Not specified
7.1 — Precautions for safe handling
- Precautions for safe handling
- Use 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 tightly closed containers in a cool, dry place, away from incompatible substances.
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 appropriate respiratory protection if ventilation is inadequate.
9.1 — Information on basic physical and chemical properties
- Physical state
- Liquid
- Colour
- Colorless
- Odour
- Ammoniacal
- Odour threshold
- Not applicable
- pH value
- 13
- Relative evaporation rate (butylacetate=1)
- <1
- Melting point
- -10 °C
- Freezing point
- Not applicable
- Boiling point
- 100 °C
- Flash point
- Not applicable
- Auto-ignition temperature
- Not applicable
- Decomposition temperature
- Not applicable
- Flammability (solid, gas)
- Not flammable
- Vapour pressure
- Not applicable
- Relative vapour density at 20°C
- Not applicable
- Density
- 0.9 g/cm³
- Solubility
- Fully miscible in water
- Log Pow
- Not applicable
- Viscosity, kinematic
- Not applicable
- Viscosity, dynamic
- Not applicable
- Explosive properties
- Not explosive
- Oxidising properties
- Not oxidizing
- Explosive limits
- Not applicable
10.1 — Reactivity
- Reactivity
- 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 metals.
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 solution is widely used in the semiconductor industry for etching silicon wafers, where it plays a critical role in the fabrication of microelectronic devices. Additionally, it is employed in organic synthesis as a strong base for various chemical reactions, including deprotonation and nucleophilic substitutions. Its ability to facilitate reactions in aqueous media makes it valuable in both academic and industrial research settings. Furthermore, it is utilized in the production of surfactants and as a catalyst in certain organic reactions.
ISO 9001
ISO 14001
GMP
COA with every batch
- Batch Number
- AL-2026-AL2572G
- Manufacturing Date
- September-2026
- Expiry Date
- September-2031
- Molecular Weight
- 91.15 g/mol
| Test | Standard | Observed |
|---|---|---|
| Assay | 25% | 25.2% |
| pH | 13 | 13.1 |
| Density | 0.9 g/cm³ | 0.89 g/cm³ |
| Moisture Content | <1% | 0.5% |
| Residue on Ignition | <0.1% | 0.05% |
| Related Substances | None detected | None detected |
The above product is expected to comply with 25% solution in water grade specification.
Technical Data Sheet
| Grade | Assay/Purity | Melting/Boiling Point | Moisture/LOD | Residue on Ignition | Related Substances | Solubility |
|---|---|---|---|---|---|---|
| 25% solution in water | 25% | 100 °C | <1% | <0.1% | None detected | Fully miscible in water |
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