Description

Sodium Dichromate Dihydrate is an inorganic compound widely recognized for its powerful oxidizing properties. This high-purity material is essential in industrial processes where controlled oxidation and corrosion resistance are critical. Key industries that rely on this compound include metal finishing, pigment manufacturing, and wood treatment, where it serves as a precursor for chromium-based chemicals.

Application

• Metal Surface Treatment: As a key component in electroplating baths and conversion coatings to provide corrosion resistance and enhance paint adhesion on metals like aluminum and zinc.
• Pigment Manufacturing: Acts as a primary raw material in the synthesis of various chromium-based inorganic pigments, such as chrome yellow and chrome green.
• Wood Preservative: Used in formulations for protecting timber against fungal decay and insect attack, often in combination with copper salts.
• Chemical Synthesis: Serves as a versatile oxidizing agent in organic synthesis and as a precursor for other chromium compounds like chromium trioxide.
• Laboratory Reagent: Employed in analytical chemistry for titration and as a cleaning solution for laboratory glassware.
• Textile Dyeing Auxiliary: Functions as a mordant to fix dyes onto fabrics, improving color fastness.

Basic Information

Product Name	Sodium Dichromate Dihydrate
CAS No.	7789-12-0
Molecular Formula	Na₂Cr₂O₇·2H₂O
Molecular Weight	298.00 g/mol
Synonyms	Sodium Bichromate Dihydrate; Dichromic Acid, Disodium Salt, Dihydrate; Sodium Dichromate(VI) Dihydrate; Bichrome; Natriumdichromat Dihydrat (German); Disodium Dichromate Dihydrate; Chromic Acid (H2Cr2O7), Disodium Salt, Dihydrate
EINECS	234-190-3

Quality Control

Our Sodium Dichromate Dihydrate is manufactured under a stringent quality management system. Each batch undergoes comprehensive analytical testing to ensure it meets precise chemical and physical specifications. A Certificate of Analysis (COA) detailing purity, assay, and impurity profiles is provided with every shipment to guarantee traceability and compliance with your technical requirements.

Storage

Preserve in a tightly closed container, protected from light. Store in a cool, dry, well-ventilated area away from incompatible materials. This product is hygroscopic (moisture-sensitive) and a strong oxidizer; keep container tightly sealed and separate from combustible and reducing agents. Recommended storage temperature: 15-25°C.

Specification

Item	Specification
Appearance	Orange-red crystalline powder
Identification (IR)	Conforms
Assay (Na₂Cr₂O₇·2H₂O)	≥ 99.0 %
pH (5% Solution)	3.5 - 4.5
Insoluble Matter	≤ 0.01 %
Chloride (Cl)	≤ 0.005 %
Sulfate (SO₄)	≤ 0.01 %
Moisture (Loss on Drying)	10.0 - 12.0 %

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