Sodium Metabisulfite Powder

Sodium Metabisulfite Powder Specification

Appearance
White Powder

CAS No
7681-57-4

Shape
Crystalline powder

Ph Level
4.0 - 5.0 (1% solution)

Taste
Pungent, sulfurous

Usage
As antioxidant, preservative, disinfectant, and reducing agent

Shelf Life
12-24 months under proper storage

Poisonous
Yes, if ingested in large quantities

Melting Point
150 C (decomposes)

Storage
Store in cool, dry, well-ventilated area away from moisture and acids

HS Code
28321010

Solubility
Soluble in water, insoluble in ethanol

Product Type
Chemical

Grade
Industrial / Food Grade

Application
Water treatment, food preservative, bleaching agent, photographic chemical, pharmaceuticals, pulp and paper industry

Properties
White crystalline powder, strong sulfur dioxide odor, soluble in water, releases SO2 when dissolved, reducing agent

Molecular Weight
190.10 g/mol

Purity
96% - 99% min

Physical Form
Powder

Molecular Formula
Na2S2O5

EINECS No
231-673-0

Smell
Pungent, sulfureous odor

Density
1.48 Gram per cubic centimeter(g/cm3)

Ingredients
Sodium Metabisulfite

Structural Formula
Na2S2O5

Stability
Stable under recommended storage conditions

Flash Point
Non-flammable

Critical Temperature
Not determined

Boiling Point
Decomposes before boiling

Hazard Class
Class 8 (Corrosive)

Packing
25 kg / 50 kg HDPE bags with inner liner

EC Number
231-673-0

Incompatibility
Acids, water, oxidizing agents

UN Number
UN 2653

Bulk Density
1.1 - 1.3 g/cm3

Odor Threshold
<0.3 ppm (SO2 release in air)

About Sodium Metabisulfite Powder

Purity	>99%
Grade	Industrial
Form	Powder
Usage/Application	ALL APPLICATION
Packaging Details	25 Kg Bag
Packaging Size	25 KG BAG
Concentration	99

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Versatile Applications

Sodium Metabisulfite Powder is essential across industries for its exceptional properties. Its use ranges from water treatment and food preservation to pulp bleaching, pharmaceuticals, and photographic processing. As a reducing agent and odor control additive, it provides effective, reliable results in diverse commercial and industrial settings.

Handling and Storage Guidelines

For optimum stability, sodium metabisulfite should be stored in a cool, dry, well-ventilated area away from moisture, acids, and oxidizing agents. The HDPE bag packaging ensures product integrity. With a shelf life of 12 to 24 months under recommended storage conditions, it maintains its efficacy and purity when handled properly.

Safety and Regulatory Compliance

This compound is classified as Class 8 (corrosive), with UN number 2653. It releases sulfur dioxide when dissolved, and inhalation or ingestion in large amounts can be hazardous. Always use protective equipment during handling. Compliance with appropriate storage, usage guidelines, and safety standards is essential for safe and effective application.

FAQ's of Sodium Metabisulfite Powder:

Q: How should Sodium Metabisulfite Powder be stored to ensure maximum shelf life?

A: To maximize shelf life, store sodium metabisulfite in a cool, dry, well-ventilated area, away from moisture, acids, and oxidizing agents. The container should be tightly sealed, and the product should remain in its original HDPE bag with an inner liner. Under these conditions, it maintains stability for 12-24 months.

Q: What are the common applications of Sodium Metabisulfite Powder?

A: Sodium Metabisulfite Powder is used in water treatment, as a food preservative, bleaching agent in the pulp and paper industry, disinfectant, antioxidant, and photographic chemical. Its reducing properties make it valuable in pharmaceuticals and other industrial processes where oxidation needs to be minimized.

Q: How is Sodium Metabisulfite Powder typically used in water treatment?

A: In water treatment, sodium metabisulfite acts as a reducing agent, efficiently removing chlorine and chloramine from water. The powder is dissolved in water, releasing sulfur dioxide, which neutralizes unwanted oxidizing compounds, making the water safer for downstream applications or equipment.

Q: What precautions should be taken when handling Sodium Metabisulfite Powder?

A: Due to its corrosive nature (Class 8 hazardous material) and the release of sulfur dioxide gas, appropriate personal protective equipment should be used. Avoid inhalation, ingestion, or contact with acids and moisture. Always handle in a well-ventilated area and follow standard safety protocols.

Q: Why is Sodium Metabisulfite considered hazardous and what are the related UN and hazard classifications?

A: Sodium Metabisulfite is designated as hazardous because it is corrosive, releases toxic sulfur dioxide gas when mixed with water or acids, and is poisonous if ingested in large quantities. It is classified under UN 2653, Class 8 (corrosive substances), necessitating careful transportation and handling.

Q: What is the process for using Sodium Metabisulfite Powder as a preservative in food products?

A: For food preservation, an appropriate amount of sodium metabisulfite is dissolved in water and added to food as directed by regulatory guidelines. It inhibits microbial growth, preserves color, and extends shelf life by releasing SO2, especially effective in dried fruits and some beverages. Only food-grade material should be used.

Q: What benefits does Sodium Metabisulfite offer compared to other preservatives and reducing agents?

A: Sodium Metabisulfite offers rapid action, high solubility, and effective preservation by releasing sulfur dioxide, which prevents spoilage and oxidation. Its strong reducing power and cost-effectiveness make it a preferred choice in various industries over some alternative agents.

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