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Oxygen scavenger and reducing agent for water, textiles, and photography
Sodium Dithionite 88%
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Sodium Dithionite 88%, also known as Sodium Hydrosulfite, is a white crystalline powder with a weak sulfurous odor. It is a sodium salt of dithionous acid. Although it is stable under most conditions, it will decompose in hot water and in acid solutions. This compound is a water-soluble salt and can be used as a reducing agent in aqueous solutions.
This product is commonly used in industrial dyeing processes as a reducing agent. It helps reduce otherwise water-insoluble dyes into water-soluble alkali metal salts, improving overall color quality. Additionally, the reduction properties of Sodium Dithionite eliminate excess dye, residual oxide, and unintended pigments, making it an ideal product for dyeing processes.
Key Features:
- White crystalline powder with a weak sulfurous odor
- Water-soluble salt and can be used as a reducing agent in aqueous solutions
- Improves overall color quality in industrial dyeing processes
Product Specifications:
| Parameter | Value |
| Chemical Name | Sodium Dithionite 88% |
| Appearance | White Crystalline Powder |
| Odor | Weak Sulfurous Odor |
| Solubility in Water | Water-Soluble Salt |
| Decomposition | In Hot Water and Acid Solutions |
Similar Products:
- Sodium Bisulfite Solution
- Sodium Formaldehyde Sulfoxylate
- Sodium Metabisulfite
- Sodium Sulfite Anhydrous
- Sodium Sulfoxylate Formaldehyde
Note: These are similar products, and each product is different, so research is required to find the best fit for your needs.
Perfect for industrial dyeing processes where improving overall color quality is a must.
Sodium Metabisulfite, 98%
Sodium metabisulfite (SMBS) is commonly used for removal of free chlorine and as a biostatic. Other chemical reducing agents exist (e.g., sulfur dioxide), but they are not as cost-effective as SMBS. When dissolved in water, sodium bisulfite (SBS) is formed from SMBS: Na2S2O5 + H2O → 2 NaHSO3, then reduces hypochlorous acid according to: 2NaHSO3 + 2HOCl → H2SO4 + 2HCl + Na2SO4. In theory, 1.34 mg of sodium metabisulfite will remove 1.0 mg of free chlorine. In practice, however, 3.0 mg of sodium metabisulfite is normally used to remove 1.0 mg of chlorine.
Product Specifications
| CAS Number | 7681-57-4 |
| Chemical Formula | Na2S2O5 |
| Grade | Food Grade, Fine Crystal |
Applications and Benefits:
- Preservative
- Antioxidant
- Bleaching agent
- Chlorine removal
- Biostatic agent
Caution:
Toxic by inhalation. Tolerance limit: 5 mg per cubic meter of air.
Synonyms:
Pyrosulfurous acid, disodium salt; Sodium Pyrosulfite; Disodium Salt Pyrosulfurous Acid; Sodium disulfite; Disodium disulfite; Disulfurous
Sodium Sulfite, Anhydrous, 98% NSF
Sodium Sulfite, Anhydrous is an inorganic compound supplied as a free-flowing granular crystal, white to pale yellow in color, odorless, and readily soluble in water. It is a versatile reducing agent valued across industrial processes for its ability to scavenge oxygen, neutralize oxidizing agents, and act as a sulfonating agent. Its granular, free-flowing form makes it easy to dose, handle, and dissolve into solution.
Product Specifications
| Chemical Name | Sodium Sulfite, Anhydrous |
| Chemical Formula | Na2SO3 |
| CAS Number | 7757-83-7 |
| Molecular Weight | 126.04 g/mol |
| Sodium Sulfite (Na2SO3) | 97.0 – 100.0 % |
| Alkalinity (as Na2CO3) | 0.0 – 0.5 % |
| Sodium Sulfate (Na2SO4) | 0.0 – 2.5 % |
| Chlorides (Cl) | 0.0 – 0.02 % |
| Heavy Metals (as Pb) | 0.0 – 20 ppm |
| Iron (Fe) | 0.0 – 15 ppm |
| Water Insolubles | 0.0 – 100 ppm |
| pH (1% Solution) | 9.7 – 10.3 |
| Appearance | White to Pale Yellow |
| Physical State | Solid, Free-Flowing Granular Crystal |
| Relative Density | 2.63 |
| Bulk Density | ≈ 95 lb/ft³ |
| pH (5% Solution) | ≈ 10.1 |
| Solubility in Water | 17% at 10°C; 28% at 33.3°C |
| Decomposition Temperature | 900°C |
| Shelf Life | Nominally 36 months when properly stored in original packaging |
| Storage Conditions | Store in a cool, dry, well-ventilated indoor environment. Keep away from acids and oxidizing agents. |
Applications and Benefits:
- Used as a pulping agent in chemimechanical, chemithermomechanical, and sulphite pulp production.
- Removes dissolved oxygen from steam boiler water systems.
- Removes excess chlorine from wastewater treatment processes.
- Functions as a solubilizing agent in vegetable tanning.
- Acts as a sulfonating agent in chemical manufacturing.
- Serves as a reducing agent in polymerization and surfactant production.
- Used as a reducing agent for dyes in textile processing.
- Reduces chrome and other metals in industrial applications.
- Acts as a preservative and antioxidant in photographic developer solutions.
- Free-flowing granular form allows easy handling, dosing, and dissolution.
Caution:
Not classified as hazardous under the Globally Harmonized System (GHS) and not regulated for transport by the US DOT. Reacts with acids to release sulfur dioxide (SO₂), a toxic and irritating gas. Incompatible with oxidizing agents and may generate strong exothermic reactions. May cause severe allergic reactions in sulfite-sensitive individuals. Avoid skin and eye contact and inhalation of dust. For NSF applications, the maximum usage level is 22 mg/L. For ozone reduction, use approximately 215 mg/L sodium sulfite per 100 mg/L ozone. Residual sulfite levels shall not exceed 100 ppm in finished water. Store in a cool, dry, well-ventilated area away from acids and oxidizers. Refer to the Safety Data Sheet (SDS) before use.
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