Description

Potassium Carbonate, Sesquihydrate CAS NO 6381-79-9 is a hydrated inorganic salt of potassium and carbonic acid, widely recognized for its utility as a strong alkali and desiccant. This compound is essential for processes requiring a mild, soluble base with excellent buffering capacity and potassium ion delivery. It is a critical raw material for manufacturers in the glass, detergent, food additive, and agricultural chemical industries, where consistent quality and reliable supply are paramount.

Application

• Glass Manufacturing: Acts as a vital fluxing agent to lower the melting point of silica, improving the workability and clarity of specialty glass, optical lenses, and television tubes.
• Food Processing (FCC Grade): Used as a pH regulator, stabilizer, and leavening agent in baked goods, wine production, and cocoa processing.
• Detergent & Soap Production: Serves as a key ingredient in liquid soaps and detergents, providing alkalinity for saponification and enhancing cleaning power.
• Chemical Synthesis: Functions as a drying agent for organic solvents and as a mild base catalyst in various organic reactions and pharmaceutical intermediates.
• Agriculture: Used in the formulation of certain fertilizers and pesticides, providing a soluble source of potassium.
• Electrolyte & Buffer Solutions: Employed in analytical chemistry and certain battery formulations due to its ionic conductivity and buffering properties.
• Textile & Dyeing: Utilized in wool washing and textile processing to neutralize acids and condition fibers.
• Fire Suppression: A component in certain dry chemical fire extinguishers for combating Class B and C fires.

Basic Information

Product Name	Potassium Carbonate, Sesquihydrate
CAS No.	6381-79-9
Molecular Formula	K2CO3 · 1.5H2O
Molecular Weight	165.23 g/mol
Synonyms	Potassium Carbonate Hemihydrate; Dipotassium Carbonate Sesquihydrate; Carbonic Acid, Dipotassium Salt, Sesquihydrate; Pearl Ash; Potash; Kaliumcarbonat Sesquihydrat; E501(ii)
EINECS	206-059-0 (anhydrous base)

Quality Control

Our Potassium Carbonate Sesquihydrate is produced under a stringent quality management system. We offer various grades, including Technical, Food (FCC), and Pharmaceutical (USP/EP) specifications, each subject to rigorous analytical testing. Certificates of Analysis (COA) documenting purity, assay, and impurity profiles are available for every batch to ensure compliance with your specific application requirements and regulatory standards such as REACH and FDA where applicable.

Storage

Preserve in a tightly closed container, protected from light. Store in a cool, dry, well-ventilated area at room temperature (15-25°C). This material is hygroscopic (moisture-sensitive) and must be kept in original packaging or a suitable moisture-proof container to prevent caking and degradation. Keep away from strong acids.

Specification

Item	Specification
Appearance	White granular or crystalline powder
Identification (IR)	Conforms
Assay (K2CO3)	≥ 98.0 %
Water (Karl Fischer)	13.0 - 16.5 %
Insoluble Matter	≤ 0.02 %
Chloride (Cl)	≤ 0.003 %
Sulfate (SO4)	≤ 0.01 %
Heavy Metals (as Pb)	≤ 0.001 %

Note: Specifications can be tailored. Please contact us for the detailed technical data sheet of a specific grade.