Sodium Peroxydisulfate

molecular formula, molecular weight & constitutionalformula
molecular formula:Na₂S₂O₈
constitutionalformula:
Molecular Weight:238.13
CAS: 7775-27-1UN1505
Mainly physicochemical properties & technicaldata:
Sodium persulfate is a white, crystalline, odourless salt orpowder. It is dissolved by ethanol, and has a good stability in normaltemperatureIt is used as initiator for the polymerisation of monomers and as astrong oxidizing agent in many applications. It has the particular advantage ofbeing almost non-hygroscopic, of having a particularly good storageand of beingeasy and safe to handle.

Application:
Polymerisation: Initiatorfor the emulsion or solution polymerisation of acrylic monomers, vinyl acetate,vinyl chloride etc. and for the emulsion copolymerisation of styrene,acrylonitrile, butadiene etc.. Dosage: 0.1-0.5% NPS (SPS). Temperature: 75-95°C.In combination with redox systems (ascorbic acid, Rongalit, sulfites or sugar-possibly in combination with heavy metal salts such as Fe 2+ it can also beused for polymerisation reactions carried out at lower - and even at ambient -temperatures. To reduce the residual monomer content, a combination of NPS (SPS)with TBHP-78-AQ is recommended, particularly in cases where redox systems areused.

Metal treatment: Treatment of metal surfaces (e.g. in themanufacture of semiconductors; cleaning and etching of printed circuits),activation of copper and aluminium surfaces.
Cosmetics: Essential component of bleachingformulations.
Paper: Modification of starch; Repulping of wet-strengthpaper.
Textile: Desizing agent and bleach activator - particularlyfor cold bleaching (i.e. bleaching of Jeans).

Others:
- Chemical synthesis
- Water treatment (decontamination)
- Waste gas treatment, oxidative degradation of harmful substances (e.g.Hg)
- Disinfectant

Storage:
NPS (SPS) is not combustible but assistscombustion of combustible materials due to release of oxygen. Provided it isstored under appropriate condition. It must be stored dry in closed containersand protected from direct sunlight, heat and humidity. Impurities such as dirt,rust or traces of metal and reductants may cause catalytic decomposition. Theproduct as supplied or in solution needs to be handled with appropriate care.The eye, skin and clothes must be protected when working with NPS (SPS). NPS(SPS) as damp powder or aqueous solution has a bleaching and slightly corrodingeffect.
Package:
(1) 25kg net weight paper bag with one PE liner
(2)25kg net weight big woven bag with two PE liners
(3) 25kg net weight fiberdrum with one PE liner
(4) 1000kg net weight big woven bag with one PEliner

Transportation:
Road/Rail transport: GGVS, GGVE, ADR,RID: CLASS 5.1
Sea transport: GGV See/IMDG code: CLASS 5.1 Page 5185, UNno.1505
Water hazards class 1 (slight water hazard)