Sodium Metabisulfite
Dongguan Weiqi Chemical Co., Ltd. was established in March 2019, at a time when China's chemical industry was undergoing rapid growth, with increasing demand for chemical products across various sectors. Founded by industry veterans with extensive experience in chemistry, the company is located in Qiaotou Town, Dongguan City, Guangdong Province. Qiaotou's dynamic industrial ecosystem and convenient transportation facilitate raw material procurement and product distribution.
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Sodium Metabisulfite 50kgSodium metabisulfite, with the chemical formula Na₂S₂O₅, is a widely used chemical compound in various industries such as food, pharmaceuticals, and textiles. When it comes to its packaging,...read more -
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Sodium Metabisulfite in MedicalSodium metabisulfite, with the chemical formula Na₂S₂O₅, has found several applications within the medical field due to its unique chemical properties. Despite not being as commonly known as some...read more
Why choose us
Strict Quality Control
Regular sampling and testing during production help identify any potential quality deviations. Final products undergo rigorous performance and safety tests before delivery. All measures adhere to international quality management standards, ensuring that customers receive only first-class chemical products.
Advanced Facilities
A dedicated R&D laboratory is equipped with sophisticated analytical instruments, enabling our R&D team to conduct in-depth research, develop new formulas, and optimize existing products.
Certificates and Documents
- SGS (Swiss General Standards)
- Hazardous Chemicals Business License
- Non-pharmaceutical Precursor Chemicals Business Filing Certificate (Ether, Acetic Anhydride, Bromine)
- Non-pharmaceutical Precursor Chemicals Business Filing Certificate (Acetone, Toluene, Sulfuric Acid, Potassium Permanganate)
Our Services
We offer free returns and exchanges for quality issues within 30 days, provide SGS inspection reports, and offer long-term discounts to loyal customers.
Sodium metabisulfite appears as a white crystalline or powder solid with a slight sulfur odor. Toxic by inhalation. Strongly irritates skin and tissue. Noncombustible, but may decompose to emit toxic oxide fumes of sulfur and sodium when heated to high temperature. A corrosive acid when mixed with water. Used as a food preservative and as a laboratory reagent.
Product name: Sodium metabisulfite
Other name: Sodium pyrosulfite;disodiummetabisulfite; disodiumpyrosulphite;
HS CODE: 28321000
Molecular Formula: Na2S2O5
Molecular weight: 190.09
Appearance: White crystal powder
Product Parameters
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Test Iterms |
Specification |
Test Result |
|
Purity(As Na2S2O5) ; %≥ |
97% |
97.3 |
|
Iron(As Fe); % ≤ |
0.003 |
0.002 |
|
Arseni c; mg/kg ≤ |
5.0 |
<5.0 |
|
Heavy Metal(As Pb); mg/kg ≤ |
1.0 |
<1.0 |
|
Water insoluble matter |
0.05 |
0.02 |
|
Index of sodium metabisulfite |
Content |
|
|
Food grade |
Industrial grade |
|
|
PURITY (AS NA2S2O5) |
97%MIN |
96%MIN |
|
SO2 |
65.0%MIN |
65%MIN |
|
AS |
0.0002% MAX |
- |
|
HEAVY METALS (AS Pb) |
0.0005% MAX |
- |
|
SE |
0.0005% MAX |
- |
|
IRON (Fe) |
0.001% MAX |
0.002% MAX |
|
WATER TREATMENT |
0.02% MAX |
0.05% MAX |
|
PH VALUE |
4.0-4.8 |
4.0-4.8 |
|
PURITY (AS NA2S2O5) |
97% MIN |
96% MIN |
Properties
Appearance
White crystals or crystalline powder. Slowly oxidized to Na2SO4 (sodium sulfate) and release sulfur dioxide (SO2) gas if exposed to air and moisture. SO2 is also released by the reaction with acid.
Solubility
Soluble in water and its water solubility increases with temperature, 54g/100ml at 20°C and 81.7g/100ml at 100°C. It produces sodium bisulfite (HSO3−) when dissolved in water and the aqueous solution is acidic with the PH 4.0-5.5 (10 % aqueous solution).
Physical Properties
Sodium sulfite has a white or whitish-yellow appearance in its solid-state.
It has a faintly pungent smell similar to SO2.
Na2S2O5 is fairly soluble in water – its solubility corresponds to 65.3g/100mL at a temperature of 20oC.
This compound is highly soluble in glycerol but not very soluble in ethanol.
When introduced to water, sodium metabisulfite liberates sulfur dioxide gas which has a very pungent and unpleasant odour. This gas can also lead to respiratory problems in humans.
SO2 gas is liberated by this compound on exposure to strong acids such as hydrochloric acid. The chemical equation for this reaction is given by: 2HCl + Na2S2O5 → 2SO2 + 2NaCl + H2O
When heated, sodium metabisulfite undergoes decomposition to form sodium sulfite and sulfur dioxide. The chemical reaction is: Na2S2O5 → SO2 + Na2SO3
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Applications |
Water Treatment - Eliminating dissolved oxygen in waste water and in pipes; - Cleaning water pipes and reverse osmosis membranes in desalinization equipment as it is an antibacterial. - It is used in water treatment plants to remove excess chlorine. |
|
Bleaching Agent - It functions as a bleaching agent, which is useful in making paper pulp, cotton and wool. |
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|
Photographic and film industry - For preparing developer solutions, for acidifying fixing baths(photo grade). |
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Landscape Gardening - It used in landscape gardening as a tree stump remover, as it disintegrates the lignin -- chemicals in plant cell walls -- in the tree stumps, making them easier to remove |
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Gold mining - It is used as an SO2 source (mixed with air or oxygen) for the destruction of cyanide in commercial gold cyanidation processes. - It is also used to precipitate gold from auric acid (gold dissolved in aqua regia). |
Packaging & Shipping
25kg pp bag or 1000kg jumbo bag or as per customer request;
Packaging and transportation requirements: It is strictly prohibited to mix with oxidants, acids, food chemicals, etc. During transportation, it should be protected from sunlight, rain and high temperature.
Certificates and Documents
As one of the leading sodium metabisulfite manufacturers and suppliers in China, we warmly welcome you to wholesale bulk sodium metabisulfite for sale here and get pricelist from our factory. All chemicals are with high quality and low price.
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