Sodium persulfate
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| Sodium persulfate | |
|---|---|
| Image:Sodium persulfate.jpg | |
| General | |
| Other names | sodium peroxodisulfate sodium peroxodisulphate sodium peroxydisulfate sodium peroxydisulphate |
| Molecular formula | Na2S2O8 |
| Molar mass | 238.03 g/mol |
| Appearance | white powder |
| CAS number | [7775-27-1] |
| EINECS number | [231-892-1] |
| Properties | |
| Density and phase | 2.40 g/cm3, solid |
| Solubility in water | >10% |
| Melting point | 180°C (decomposes) |
| Boiling point | ? |
| pH | 6.0 (1% solution) |
| Hazards | |
| EU classification | not listed |
| NFPA 704 |    |
| Except where noted otherwise, data are given for materials in their standard state (at 25 °C, 100 kPa) Infobox disclaimer and references |
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Sodium persulfate (Na2S2O8) is a chemical compound. It is a strong oxidizer. Its risk and safety phrases are R8 R20 R22 R36 R37 R38 R42 R43 S8 S17 S26 S36. It is a severe irritant of skin, eyes, and respiratory system. It is almost non-hygroscopic and has particularly good ability to be stored for long time. It is easy and safe to handle. It is not combustible, but releases oxygen easily and assists combustion of other materials.
It is used as a bleach, both standalone (particularly in hair cosmetics) and as a detergent component. It is a replacement for ammonium persulfate in etching mixtures for zinc and printed circuit boards, and is used for pickling of copper and some other metals. It is a source of free radicals, making it useful as an initiator for eg. emulsion polymerization reactions and for accelerated curing of low formaldehyde adhesives. It is also used as a soil conditioner and in manufacture of dyestuffs, modification of starch, bleach activator, desizing agent for oxidative desizing, etc.
Conditions/substances to avoid mixing persulfates with are: moisture, heat, flame, ignition sources, shock, friction, reducing agents, organic material, sodium peroxide, water, aluminum and powdered metals.
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