Description

Sodium Hydroxide Monohydrate, 99.996% (Metals Basis) is an ultra-high purity solid form of sodium hydroxide containing one molecule of water of crystallization. This exceptional purity level, particularly on a metals basis, is critical for advanced manufacturing processes where trace metallic impurities can compromise product performance or catalyze unwanted reactions. It is an essential reagent for industries requiring stringent control over ionic contamination, such as semiconductor fabrication, high-performance battery research, and the synthesis of specialty chemicals and pharmaceuticals.

Application

• Semiconductor Manufacturing: Used as an ultra-pure etchant and cleaning agent for silicon wafers, where trace metal levels are critically controlled.
• Precursor Synthesis: Serves as a high-purity base in the synthesis of advanced materials, catalysts, and pharmaceutical intermediates.
• Analytical Chemistry: Employed as a primary standard or key reagent in trace metal analysis, titration, and chromatography.
• Electrolyte & Battery Research: Utilized in the development and formulation of advanced electrolytes for alkaline and other battery systems.
• Photovoltaic Cell Production: Applied in the cleaning and texturing processes of solar cells.
• Laboratory Research: Acts as a fundamental, high-purity chemical for R&D across material science, nanotechnology, and electrochemistry.

Basic Information

Product Name	Sodium Hydroxide Monohydrate, 99.996% (Metals Basis)
CAS No.	12179-02-1
Molecular Formula	NaOH · H₂O
Molecular Weight	58.00 g/mol (Anhydrous NaOH: 40.00 g/mol)
Synonyms	Caustic Soda Monohydrate; Sodium Hydrate Monohydrate; NaOH Monohydrate; White Caustic Monohydrate; Soda Lye, solid monohydrate; Sodium Hydroxide Hydrate; Natriumhydroxid-Monohydrat (German); Hidróxido de sodio monohidrato (Spanish)
EINECS	215-185-5 (for Sodium Hydroxide)

Quality Control

This 99.996% (Metals Basis) grade is produced and tested to meet the exacting standards required for advanced technology applications. Our products undergo rigorous quality testing to ensure compliance with industry standards. Certificates of Analysis (COA) are available upon request, detailing purity, specific metallic impurity profiles (e.g., Fe, Cu, Ni, Cr, Al), and other critical parameters.

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 highly hygroscopic (moisture-sensitive) and must be kept in a dry environment to prevent caking and absorption of atmospheric carbon dioxide. Use appropriate corrosion-resistant containers.

Specification

Item	Specification
Appearance	White flakes or pellets
Assay (NaOH)	≥ 99.996% (Metals Basis)
Identification (IR)	Conforms
Water (Karl Fischer)	~ 30.0 - 31.0 %
Insoluble Matter	≤ 0.005 %
Carbonate (as Na₂CO₃)	≤ 0.05 %
Chloride (Cl)	≤ 0.001 %
Sulfate (SO₄)	≤ 0.002 %
Silicate (SiO₂)	≤ 0.005 %
Iron (Fe)	≤ 1 ppm
Heavy Metals (as Pb)	≤ 5 ppm

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