Tetraethylammonium Hydroxide (TEAH) | CAS# 77-98-5

SACHEM’s Tetraethylammonium Hydroxide (TEAH, CAS# 77-98-5) is quaternary ammonium compound that has a variety of applications.  SACHEM has manufacturing facilities in America, Europe and Asia and can ship our product globally. Tetraethylammonium hydroxide is a strong organic base and finds applications in photovoltaic chemicals, advanced ceramics, flat panel display chemicals, selective etching and transesterification catalysts.

Air sensitive, absorbs carbon dioxide from the air. Keep the container tightly closed and sealed until ready for use.

Benefits of SACHEM’s TEAH:

  • Strong base strength
  • Solubility in organic solventsTetraethylammonium Hydroxide, TEAH, CAS# 77-98-5
  • Miscibility and stability in photoresist solutions
  • Low volatility


(TEAH has been used an alternative to Tetramethylammonium hydroxide in the electronic materials industry.)


Available Products
Tetraethylammonium Hydroxide, 20% Aqueous
TEAH 20% Aq
Tetraethylammonium Hydroxide 20AQ Quote Tetraethylammonium Hydroxide 20AQ sample
Tetraethylammonium Hydroxide, 20% Ultra Pure
Tetraethylammonium Hydroxide 20UP Quote Tetraethylammonium Hydroxide 20UP sample
Tetraethylammonium Hydroxide, 35% Aqueous
TEAH 35% Aq
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Tetraethylammonium Hydroxide, 35% Ultra Pure
Tetraethylammonium Hydroxide 35UP Quote Tetraethylammonium Hydroxide 35UP Sample Tetraethylammonium Hydroxide 35UP


National Center for Biotechnology Information. PubChem Database. Tetraethylammonium hydroxide, CID=6509, https://pubchem.ncbi.nlm.nih.gov/compound/Tetraethylammonium-hydroxide

CAS Number 77-98-5
Tetraethyl ammonium hydroxide
Ammonium tetraethyl-, hydroxide
Ethanaminium, N,N,N-triethyl-, hydroxide
Linear Formula (C2H5)4N(OH)


"Tetraethylammonium Hydroxide (TEAH) | CAS# 77-98-5"