Sodium dithionite (also known as sodium hydrosulfite; CAS No. 7775-14-6; molecular formula Na₂S₂O₄) is a high-performance, strongly reducing inorganic chemical raw material. It is widely used in industrial sectors such as textile printing and dyeing, paper pulp bleaching, kaolin processing, and fur treatment.
As a supplier of sodium dithionite, Aojin Chemical Technology Co., Ltd. provides a stable supply to overseas customers worldwide.
Sodium dithionite appears as a white crystalline powder. It is stable under dry, sealed conditions but decomposes easily when exposed to moisture and high temperatures. Classified as a Class 4.2 spontaneously combustible hazardous chemical (UN No. 1384), it requires strict adherence to hazardous chemical handling protocols during storage and transport; it must be stored in a cool, dry, and well-ventilated warehouse, away from heat sources, oxidizing agents, and acidic materials. Standard industrial-grade specifications include purity levels of 85%, 88%, and 90%.
Key Application Areas
1. Textile Printing and Dyeing Industry: Serves as a crucial reducing agent for vat dyeing; used in the reduction dyeing of cotton fabrics, color stripping in printing, fabric bleaching and cleaning, and the scouring and bleaching of silk and wool. It enhances fabric whiteness and dyeing uniformity, making it a core auxiliary agent in printing and dyeing plants.
2. Paper Industry: Used for bleaching mechanical wood pulp and de-inked pulp; improves paper whiteness and reduces pulp yellowing.
3. Non-metallic Mineral Processing: Used for the reductive bleaching of kaolin and china clay; removes metallic impurities from the ore, enhances kaolin whiteness, and meets quality requirements for coatings and ceramic fillers.
4. Fur and Bamboo/Straw Products: Used for bleaching and brightening furs, as well as decolorizing bamboo, rattan, and straw woven products. Aojin Chemical maintains strict quality control over its sodium dithionite supplies. We provide a Certificate of Analysis (COA) and a Material Safety Data Sheet (MSDS) for every batch. We support full-container exports of hazardous chemicals and offer various shipping solutions—including standard containers and specialized hazardous-material containers—serving buyers across Southeast Asia, the Middle East, Africa, and South America.
Whether you represent a textile dyeing plant, paper mill, mineral processing facility, or are an international trading company, please contact Aojin Chemical for the latest price quotes.
FAQ
Q1: Are sodium dithionite and "insurance powder" (baoxianfen) the same product?
A: Yes, they are the same chemical. Sodium dithionite is the chemical name, while "insurance powder" is the common industrial term. They share the same CAS number (7775-14-6), molecular formula (Na₂S₂O₄), and specifications.
Q2: What are the common purity specifications for sodium dithionite?
A: The mainstream industrial-grade specifications on the market are 85%, 88%, and 90%.
Q3: Is sodium dithionite classified as a hazardous material? What is its UN number?
A: It is classified as a Class 4.2 hazardous chemical (spontaneously combustible solid) with UN number 1384. Exports require adherence to specific hazardous chemical procedures for customs declaration and shipping space booking.
Q4: What is the minimum order quantity (MOQ) for sodium dithionite?
A: We typically handle full-container orders and provide price quotes to customers within 24 hours of receiving an inquiry.
Q7: In what scenarios is sodium dithionite primarily used for bleaching?
A: It is used for the reductive bleaching of textiles, pulp, kaolin clay, and fur. It achieves decolorization and whitening effects through strong reducing properties; it is not suitable for ordinary household bleaching applications. Shandong Aojin Chemical Technology Co., Ltd. specializes in the global export of inorganic and fine chemical raw materials. Our core products include sodium hydrosulfite, potassium dihydrogen phosphate, sodium formate, MEA, and MEG. With extensive experience in handling hazardous chemical exports, we provide stable and reliable supply solutions to clients across industries such as industrial manufacturing, textile printing and dyeing, papermaking, and mining. We welcome inquiries and business discussions from domestic and international customers.
Post time: Sep-30-2026
