Sodium Sulfite Anhydrous
Product Description
Sodium Sulfite Anhydrous is a white, odorless crystalline powder, well known for its excellent reducing properties. It plays a crucial role in industries like pulp & paper, water treatment, textiles, and photographic development due to its effective oxygen-scavenging, dechlorination, and antioxidant properties.
✅ Key Advantages
✔️ Reliable oxygen scavenger in boiler and RO water treatment
✔️ Acts as a strong reducing agent in photographic and chemical processing
✔️ High purity, low iron content, and consistent solubility
✔️ Flexible packaging and stable supply for industrial bulk needs
Get in Touch With Us
- 📱Tel/WeChat: +86 15315760566
- 💬WhatsApp: +86 15315760566
- ✉️ Email: harris@qibenchemical.com
Grade / Product Types
Available Grades
🏭 Industrial Grade: widely used in paper bleaching, textile dyeing, and chemical synthesis
🔬 Analytical Grade: used in lab reagents and fine chemicals
Physical Appearance
White crystalline powder or granules
Odorless and highly soluble in water
Standard Packaging
25kg plastic woven bags with PE liner
50kg fiber drums
1000kg jumbo bags for container load
Custom pallet wrap & labeling available
Warehouse and loading photos provided on request
Typical Specifications
| Item | Typical Value |
|---|---|
| CAS Number | 7757-83-7 |
| Molecular Formula | Na₂SO₃ |
| HS Code | 28321090 |
| Purity (as Na₂SO₃) | ≥ 96.0%–98.0% |
| Iron (Fe) | ≤ 0.005% |
| pH (5% solution) | 9.0–10.0 |
| Water Insoluble | ≤ 0.05% |
| Heavy Metals | ≤ 5 ppm |
| Appearance | White powder/crystal |
Main Applications
🔹 Pulp & Paper Industry
– Used in bleaching wood pulp and improving paper brightness.
– Helps reduce lignin without damaging cellulose fibers.
🔹 Water Treatment
– Acts as a dechlorination agent for RO systems and boiler feedwater.
– Removes residual chlorine and oxygen to prevent corrosion.
🔹 Textile Industry
– Used in dye reduction and bleaching processes.
– Improves dye uptake and prevents discoloration.
🔹 Photography
– Functions as a stabilizer and developer in photo processing.
– Helps prevent oxidation of sensitive chemicals.
🔹 Chemical & Pharmaceutical
– Employed as an intermediate or stabilizer in synthesis.
– Controls oxidation in specific API and formulations.
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Frequently Asked Questions
Here we’ve gathered answers to common questions about our products, packaging, shipping, and support. Feel free to contact us if you need more details.
Yes, free samples are available for quality testing. Shipping costs can be discussed based on your location.
We offer sea, air, and train freight depending on your country and quantity. FOB, CIF, and DDP terms are all available.
Each batch is strictly tested before delivery. COA and third-party inspection (SGS/BV) can be provided if required.
Yes. We support private labeling, palletizing, custom printing, and OEM packaging solutions.
Our products are widely exported to Southeast Asia, the Middle East, Africa, Europe, and South America with stable long-term clients.
