Tetramethylammonium Hydroxide CAS 75-59-2

1. Tetramethylammonium hydroxide CAS 75-59-2 is primarily used as a high-purity organic base in the microelectronics industry, serving as a developer in photolithography processes and as an etchant for silicon wafers . The 25% solution is most common in the electronics field .
2. The compound is also utilized as a thermochemolysis reagent in analytical chemistry, especially in astrobiology for gas chromatography-mass spectrometry (GC-MS) analysis to detect organic molecules like carboxylic acids and nucleobases . Tetramethylammonium hydroxide CAS 75-59-2 can function as an organosilicon catalyst (industrial grade) .
3. Applications of Tetramethylammonium hydroxide include its use in research for sample preparation (e.g., dissolving biological tissues for metal analysis) and in the synthesis of advanced materials like MXenes .

1. Store Tetramethylammonium hydroxide CAS 75-59-2 in a tightly sealed container under inert gas (e.g., nitrogen) in a dry, well-ventilated place, as it is hygroscopic and absorbs carbon dioxide from air . Keep container tightly closed .
2. Keep Tetramethylammonium hydroxide away from strong acids and incompatibles, as it is a strong base (pH >13 for 25% solution) and reacts violently, generating heat . Solutions should be stored separately from other chemicals .
3. Always Tetramethylammonium hydroxide use appropriate personal protective equipment (PPE) including chemical splash goggles, chemical-resistant gloves (nitrile, minimum 0.11 mm thickness), lab coat, and chemical-resistant apron . Handle only with adequate ventilation in a fume hood and avoid breathing vapors or mists .

1. Immediately isolate the spill area, use full personal protective equipment, and ensure adequate ventilation. Do NOT let Tetramethylammonium hydroxide CAS 75-59-2 enter drains or waterways, as Tetramethylammonium hydroxide is toxic to aquatic life .
2. Contain Tetramethylammonium hydroxide using inert, non-combustible absorbent material (e.g., sand). Carefully collect the contaminated material into sealed, labeled corrosion-resistant chemical waste containers for proper disposal according to hazardous material regulations . Do not combine with other chemical waste .
3. Personnel Tetramethylammonium hydroxide must wear suitable PPE including self-contained breathing apparatus (SCBA) during cleanup. For small spills, use absorbent paper and wash contaminated surfaces with soap and water . TMAH solutions are classified for transport as UN1835 (Hazard Class 8) .

1. Tetramethylammonium hydroxide CAS 75-59-2 is classified with GHS signal word "Danger". It is fatal if swallowed (H300) or in contact with skin (H310), causes severe skin burns and serious eye damage (H314/H318), and causes damage to organs (central nervous system, thymus gland, liver) through single or prolonged exposure (H370/H372) . Acute oral NOAEL is 1 mg/kg/day .
2. Tetramethylammonium hydroxide is toxic to aquatic life with long-lasting effects (H411) . When heated to decomposition, it emits toxic fumes of NOx and ammonia . TMAH is extremely corrosive and can cause systemic neurotoxicity leading to respiratory failure through skin absorption, with no antidote available .
3. Always Tetramethylammonium hydroxide CAS 75-59-2 consult the specific Safety Data Sheet (SDS) for Tetramethylammonium hydroxide for complete hazard information, first-aid procedures, and handling instructions. All exposures require immediate medical attention . Precautionary statements include P260 (do not breathe dust/fume/vapor), P273 (avoid release to environment), and P280 (wear protective gloves/eye protection) .