Sodium persulfate

Sodium persulfate (CAS 7775-27-1), also sold as sodium peroxydisulfate, is a strong inorganic oxidizing salt used in industrial manufacturing and treatment processes.

Where is Sodium persulfate used?

• Plastics and polymer manufacturing: initiator for emulsion and suspension polymerization of acrylic, vinyl, and styrene-based resins
• Printed circuit board fabrication: micro-etchant to clean surfaces and roughen copper before lamination or plating
• Textile and paper: bleaching fibers and pulp without chlorine-based residue concerns
• In groundwater and soil remediation it oxidizes organic contaminants in situ.
• Curing of formaldehyde adhesives.
• Oxidizing breaker added to hydraulic fracturing fluids.
• Battery depolarizers, manufacture of dyestuffs, and emulsion polymerization.

Formulation notes

• Preferred over ammonium persulfate and potassium persulfate for some applications because ammonium persulfate adds undesirable ammonium ions and potassium persulfate has much lower solubility.
• Decomposed by alcohol and silver ions.
• May react with cellulose-based absorbents.
• Moisture and metal ions such as platinum black, silver, lead, iron, copper, magnesium, nickel, manganese, or their alloys can accelerate decomposition.

Typical specification

• Standard redox potential into hydrogen sulfate is 2.1 V.
• Available in a purity of >98%.

Regulatory status

• Classified under UN transport as Class 5.1, Packing Group III.
• Customs tariff number is 28334000.

Storage, packaging and handling

• Should be stored well closed, separated from flammable substances, reducing agents, strong bases and dust metals.
• Nearly non-hygroscopic and has a particularly long storage capability.

Frequently asked questions about Sodium persulfate

What is the German water hazard class of sodium persulfate?

Sodium persulfate has a German WGK water hazard class of 1.

Technical content is compiled and updated by the SoleChem product team from public technical sources; the certificate of analysis (COA) governs product-specific specifications.