■ Oxygen scavenging and chlorine removal

This product is used in steam boiler water treatment to remove dissolved oxygen and to remove excess chlorine from wastewater. It is a white granular product that is readily soluble in water.

■ Additive, preservative, and leavening agent

This product is used as an additive, preservative, antioxidant, anti-microbic agent, and leavening agent in the food industry. It is a white granular product that is readily soluble in water.

■ Preservative

This product is used to preserve silage in feed applications. It is a white granular product that is readily soluble in water.

■ Excipient

This product is considered an excipient in the pharmaceutical industry where it is used as a preservative. It is a white granular product that is readily soluble in water.

■ Component in developing baths and stabilizing agent for fixers

This product is used as an essential component of developer baths (preserves developing agents from rapid oxidation) and fixers (stabilizes the thiosulfate ion) in the photographic industry. It is a white granular product that is readily soluble in water.

■ Reducing and sulfonating agent

This product is used as a sulfonating agent and reducing agent in chemical process with significant applications for surfactants and polymerization. It is a white granular product that is readily soluble in water.

■ Product data and typical properties

Formula: Na₂S₂O₅
Molecular Weight: 190.11
pH of 5% Solution: 4.3
Bulk Density, lb/ft³: 86
Free flowing, white, fine granular crystal having a characteristic odor of sulfur dioxide and is soluble in water.

■ Main product specifications

Arsenic (As) 0.0 – 1.0 ppm
Sodium Metabisulfite (Na₂S₂O₅) 98.6 – 99.8 %
Chloride (Cl) 0.0 – 0.02 %
Heavy Metals (as Pb) 0.0 – 10.0 ppm
Iron (Fe) 0.0 – 5.0 ppm
Lead (Pb) 0.0 – 0.5 ppm
Selenium (Se) 0.0 – 5.0 ppm
Sodium Sulfite (Na₂SO₃) 0.0 – 0.6 %
Sodium Thiosulfate (Na₂S₂O₃) 0.0 – 0.04 %
Sulfur Dioxide (SO₂) 66.4 – 67.2 %

Screen Size (U.S. Sieve) % by Weight:
Through 20 Mesh 99.0 – 100.0 %
On 40 Mesh 0.0 – 20.0 %
Through 100 Mesh 0.0 – 35.0 %
Meets all requirements of the Food Chemical Codex (FCC) and the National Formulary (NF). NSF and Kosher approved.

■ Handling and storage

Shelf Life: Nominally 36 months when properly stored in original packaging.
Storage Conditions: Controlled indoor environment that is cool, dry, and well ventilated.

■ Packaging

• 50lb sealed polyethylene bags
• 2000lb polypropylene sacks
• 3000lb polypropylene sacks
• Custom sack sizes upon request