Chinese Japanese Germany

Potassium persulfate

Outline Half-life Recrystallization Solubility in water(g/100ml) The main application areas Toxicity Storage precautions Chemical properties Uses Production method Category Toxicity grading Acute toxicity Explosive hazardous characteristics Flammability hazard characteristic Storage characteristics Extinguishing agent Professional standards
Potassium persulfate
Potassium persulfate
Chemical Name:
Potassium persulfate
Molecular Formula:
Formula Weight:
MOL File:

Potassium persulfate Properties

Melting point:
1067 °C
Boiling point:
1689 °C
vapor density 
9.3 (vs air)
storage temp. 
Store at +5°C to +30°C.
H2O: 0.5 M at 20 °C, clear, colorless
Specific Gravity
3.2 (50g/l, H2O, 20℃)
Water Solubility 
5 g/100 mL (20 ºC)
Stable. Strong oxidizer. Incompatible with strong reducing agents, organic materials, combustible materials.
CAS DataBase Reference
7727-21-1(CAS DataBase Reference)
EPA Substance Registry System
Peroxydisulfuric acid ([(HO)S(O)2]2O2), dipotassium salt(7727-21-1)
  • Risk and Safety Statements
  • Hazard and Precautionary Statements (GHS)
Hazard Codes  O,Xn
Risk Statements  8-22-36/37/38-42/43
Safety Statements  22-24-26-37
RIDADR  UN 1492 5.1/PG 3
WGK Germany  1
RTECS  TT5900000
HS Code  2833 40 00
HazardClass  5.1
PackingGroup  III
Hazardous Substances Data 7727-21-1(Hazardous Substances Data)
Toxicity LD50 orally in Rabbit: 802 mg/kg
Signal word: Danger
Hazard statements:
Code Hazard statements Hazard class Category Signal word Pictogram P-Codes
H272 May intensify fire; oxidizer Oxidising liquids;Oxidising solids Category 2
Category 3
P210, P220, P221P280, P370+P378,P501
H302 Harmful if swallowed Acute toxicity,oral Category 4 Warning P264, P270, P301+P312, P330, P501
H315 Causes skin irritation Skin corrosion/irritation Category 2 Warning P264, P280, P302+P352, P321,P332+P313, P362
H317 May cause an allergic skin reaction Sensitisation, Skin Category 1 Warning P261, P272, P280, P302+P352,P333+P313, P321, P363, P501
H319 Causes serious eye irritation Serious eye damage/eye irritation Category 2A Warning P264, P280, P305+P351+P338,P337+P313P
H334 May cause allergy or asthma symptoms or breathing difficulties if inhaled Sensitisation, respiratory Category 1 Danger P261, P285, P304+P341, P342+P311,P501
H335 May cause respiratory irritation Specific target organ toxicity, single exposure;Respiratory tract irritation Category 3 Warning
Precautionary statements:
P220 Keep/Store away from clothing/…/combustible materials.
P221 Take any precaution to avoid mixing with combustibles/…
P261 Avoid breathing dust/fume/gas/mist/vapours/spray.
P280 Wear protective gloves/protective clothing/eye protection/face protection.
P284 Wear respiratory protection.
P305+P351+P338 IF IN EYES: Rinse cautiously with water for several minutes. Remove contact lenses, if present and easy to do. Continuerinsing.
P342+P311 IF experiencing respiratory symptoms: call a POISON CENTER or doctor/physician.
P405 Store locked up.

Potassium persulfate price More Price(18)

Manufacturer Product number Product description CAS number Packaging Price Updated Buy
Sigma-Aldrich 216224 Potassium persulfate ACS reagent, ≥99.0% 7727-21-1 5g $32.2 2018-11-13 Buy
Sigma-Aldrich 216224 Potassium persulfate ACS reagent, ≥99.0% 7727-21-1 100g $45 2018-11-13 Buy
Alfa Aesar 013145 Potassium peroxydisulfate, ACS, 99.0% min 7727-21-1 250g $40.1 2018-11-16 Buy
Alfa Aesar 013145 Potassium peroxydisulfate, ACS, 99.0% min 7727-21-1 1kg $105 2018-11-16 Buy
Sigma-Aldrich 379824 Potassium persulfate 99.99% trace metals basis 7727-21-1 25g $182 2018-11-13 Buy

Potassium persulfate Chemical Properties,Uses,Production


Potassium persulfate (Formula is K2S2O8) is also known as potassium peroxydisulfate, molecular weight is 270.32, decomposition temperature is 50-60℃, it is white, odorless crystal, it is soluble in water, insoluble in alcohol, it has strong oxidizing, it is commonly used as bleaching agents, oxidizing agents, it can be used as the polymerization initiator, it almost does not absorb moisture, it has good stability at room temperature, it is easy to be stored, and it has the advantages of convenience and safety, etc. . Applications involves polymerization initiator, circuit board cleaning and etching, copper and aluminum surface activation, modified starch, pulp and textile bleaching and desizing low temperature, circulating water purification treatment systems, oxidative degradation of harmful gases, low formaldehyde adhesive stick together accelerated oxidation of ethanol and aromatic hydrocarbons, disinfectants, hair dye decolorization.
The above information is edited by the chemicalbook of Wang Xiaodong.


80℃-1.5 hours; 70℃-7.7 hours; 60℃-33 hours; 45℃-292 hours; 35℃-1600 hours.


Potassium persulfate dissolves in 30℃ water, cools, then the recrystallized product can be obtained, it is filtered and dried under reduced pressure in the presence of calcium chloride.

Solubility in water(g/100ml)

Grams which dissolves in per 100 ml of water: 4.7g/20 ℃.

The main application areas

Potassium persulfate is mainly used as initiator and strong oxidizing agents.
Potassium persulfate is the initiator of latex or solution polymerization of acrylic monomers, vinyl acetate, vinyl chloride and other product, and it is also the initiator of styrene, acrylonitrile, butadiene and the like emulsion for copolymerisation.
Strong oxidizing agent:
1. It is used as desizing agent and bleach activator.
2. It is used for oxidative degradation of harmful substances in pool and closed circular loop in water.
3. It can be applied in the production of starch modifier and applied in the production of adhesive and coating agent.
4. It can be applied in the branched-chain oxidation, alcohol and aromatic hydroxy oxidation.
5. It is one of the basic constituent of hair dyes, it plays the role of decolorization.


The amount is not specified (FAO/WHO, 2001).
Potassium persulfate powder has stimulating effect on nasal mucosa, packaging should be ventilated to prevent dust. Labour protection appliance should be dressed at work.

Storage precautions

Potassium persulfate is non-flammable, it is combustion-supporting which due to it can release of oxygen, storage environment must be dry and clean, well-ventilated. Pay attention to moisture and rain, it should not be transported in rain. Keep away from fire, heat and direct sunlight. It should be kept sealed packaging, labels should be intact and clear. It should be stored separately with flammable or combustible materials, organic compounds, as well as rust, small amount of metal, and other reducing substance, it should avoid mix to prevent causing decomposition of potassium persulfate and explosion.

Chemical properties

It is colorless or white triclinic crystalline powder. It is soluble in water, the solubility is 1.75g/100ml water at 0℃, the solubility is 5.3g/100ml water at 20℃. It is insoluble in alcohol. Queous solution is acidic.


It can be used as gluten agent of wheat flour.
It is mainly used as a disinfectant and fabric bleach. It can be used as industrial oxidant in dyes and inorganic salts. It can be used as emulsion polymerization initiators in synthetic rubber industry. It can be used as polymerization accelerator in synthetic resin. In addition, it can also be used in the steel, photographic industry and medicine.
It can be used as analytical reagents, oxidants and plastic initiator, it can also be used in the film photofinishing.
The above information is edited by the chemicalbook of Wang Xiaodong.

Production method

Potassium sulfate method
Ammonium sulfate and sulfuric acid formulates to form liquid electrolyte, it is decontaminated by electrolysis, HSO4-can discharge and generate peroxydisulfate acidat in the anode, and then reacts with ammonium sulfate to generate ammonium persulfate, Then replacement reaction can happen when potassium is added . The finished product of potassium persulfate can be obtained after cooling, separation, crystallization, drying.
Anode reaction: 2HSO4-2e → H2S2O8
Cathodic reaction: 2H ++ 2e → H2 ↑
(NH4) 2SO4 + H2S2O8 → (NH4) 2S2O8 + H2SO4
(NH4) 2S2O8 + K2SO4 + H2SO4 → K2S2O8 + 2NH4HSO4
It can be derived by replacement reaction with ammonium persulfate potassium sulfate, then it goes through cooling, separation, crystallization, drying.



Toxicity grading

Mid toxicity.

Acute toxicity

Oral-rat LD50: 802 mg/kg.

Explosive hazardous characteristics

It can explode when mixes with reductant, sulfur, phosphorus; It can explode when be heated, impacted, and meets fire.

Flammability hazard characteristic

Thermal decomposition can get oxygen; toxic fumes of nitrogen oxides can generate after combustion.

Storage characteristics

Treasury should have ventilation and be low-temperature drying; loading and unloading should be light; it should be stored separately with organic matter, reducing agents, sulfur, phosphorus combustibles.

Chemical Properties

colourless odourless crystals or white powder

Chemical Properties

Potassium persulfate is a colorless or white, odorless crystalline material.

Extinguishing agent

Mist of water, sand, foam.


Bleaching fabrics, soaps; in photography under the name Anthion to remove last traces of thiosulfate from plates and paper; in analytical chemistry.

Professional standards

TWA 2 mg/m.

General Description

A white crystalline solid. Specific gravity 2.477. Decomposes below 100°C.

Air & Water Reactions

Water soluble. Slowly decomposed by water. The salt rapidly liberates oxygen when heated, and especially so when wet.

Reactivity Profile

Potassium persulfate is an oxidizing agent. Noncombustible but accelerates the burning of combustible material. Potassium persulfate plus a little potassium hydroxide and water released sufficient heat and oxygen to ignite a polythene (polyethylene) liner in a container. [MCA Case History 1155. 1955].


Strong irritant and oxidizing agent. Fire risk in contact with organic materials.

Health Hazard

Inhalation, ingestion or contact (skin, eyes) with vapors or substance may cause severe injury, burns or death. Fire may produce irritating, corrosive and/or toxic gases. Runoff from fire control or dilution water may cause pollution.

Fire Hazard

These substances will accelerate burning when involved in a fire. Some may decompose explosively when heated or involved in a fire. May explode from heat or contamination. Some will react explosively with hydrocarbons (fuels). May ignite combustibles (wood, paper, oil, clothing, etc.). Containers may explode when heated. Runoff may create fire or explosion hazard.

Agricultural Uses

Potassium sulphate, also called sulphate of potash, is a white crystalline material, moderately hygroscopic, available in fine, granular and semi-granular forms. It contains 48 to 54% potassium (as K2O) and supplies 17 to 20 % of sulphate. Chloride-sensitive crops like tobacco, grapes and potato require chloride-free potassium fertilizers. Therefore, these crops are fertilized with potassium sulphate, although this is more expensive than potassium chloride. These three crops, being major crops, account for about 7% of the total potash consumption. For best results, potassium sulphate should contain at least 50 % potash by weight.
Potassium sulphate occurs in nature as 'langbeinite' , a double sulphate of potassium and magnesium (K2SO4?2MgSO4) and made from burkeite (Na2CO3?2Na2SO4), kainite (KCl?MgS04?3H2O) or potassium chloride (KCl) as follows:
When applied to soil, potassium ion from the watersoluble potassium sulphate is retained in the soil colloids and not easily leached out. This makes potassium sulphate an excellent fertilizer, useful for all soils and crops while sowing or before sowing. It is also a safe ingredient of powdered, mixed fertilizers.

Safety Profile

Moderately toxic by ingestion. An irritant and allergen. A powerful oxidtzer. Flammable when exposed to heat or by chemical reaction. Can react with reducing materials. It liberates oxygen above 100' when dry or @ about 50' when in solution. When heated to decomposition it emits highly toxic fumes of SOx,, S2O8, and K2O.

Potential Exposure

Potassium persulfate is used as a bleaching and oxidizing agent; it is used in redox polymeri- zation catalysts; in the defiberizing of wet strength paper and in the desizing of textiles. Soluble in water.

First aid

If this chemical gets into the eyes, remove any contact lenses at once and irrigate immediately for at least 15 minutes, occasionally lifting upper and lower lids. Seek medical attention immediately. If this chemical contacts the skin, remove contaminated clothing and wash immediately with soap and water. Seek medical attention immediately. If this chemical has been inhaled, remove from exposure, begin rescue breathing (using universal precautions, includ- ing resuscitation mask) if breathing has stopped and CPR if heart action has stopped. Transfer promptly to a medical facility. When this chemical has been swallowed, get medi- cal attention. Give large quantities of water and induce vomiting. Do not make an unconscious person vomit. Medical observation is recommended for 24?48 hours after breathing overexposure, as pulmonary edema may be delayed. As first aid for pulmonary edema, a doctor or authorized paramedic may consider administering a drug or other inhalation therapy.


UN1492 Potassium persulfate, Hazard Class: 5.1; Labels: 5.1-Oxidizer.

Purification Methods

Crystallise the persulfate twice from distilled water (10mL/g) and dry it at 50o in a vacuum desiccator. Its solubility in H2O is 1.6% at 0o, 4.5% at 20o, and 7.2% at 30o. An aqueous solution decomposes on long standing with evolution of O2 and formation of KHSO4. It is a powerful oxidising agent. Store it at ~10o. [Fehér in Handbook of Preparative Inorganic Chemistry (Ed. Brauer) Academic Press Vol I p 390 1963.]


A strong oxidizer. Incompatible with combustible, organic or other readily oxidizable materials; sulfur, metallic dusts, such as aluminum dust; chlorates and perchlorates. Attacks chemically active metals. Keep away from moisture.

Waste Disposal

Use large volumes of reducing agents (bisulfites, e.g.). Neutralize with soda ash and drain into sewer with abundant water.

Potassium persulfate Preparation Products And Raw materials

Raw materials

Preparation Products

Potassium persulfate Suppliers

Global( 225)Suppliers
Supplier Tel Fax Email Country ProdList Advantage
Henan DaKen Chemical CO.,LTD.
+86-371-55531817 CHINA 22049 58
Henan Tianfu Chemical Co.,Ltd.
0371-55170693 CHINA 20786 55
Mainchem Co., Ltd.
+86-0592-6210733 CHINA 32651 55
Hefei TNJ Chemical Industry Co.,Ltd.
86-0551-65418684 18949823763
86-0551-65418684 China 1659 55
Haihang Industry Co.,Ltd
+86 531 8582 1093 CHINA 4529 58
career henan chemical co
+86-371-86658258 CHINA 19990 58
Alfa Aesar 400-610-6006; 021-67582000
021-67582001/03/05 China 30291 84
Shanghai Aladdin Bio-Chem Technology Co.,LTD 021-20337333/400-620-6333
021-50323701 China 25106 65
J & K SCIENTIFIC LTD. 400-666-7788 +86-10-82848833
+86-10-82849933; China 96815 76
Meryer (Shanghai) Chemical Technology Co., Ltd. +86-(0)21-61259100(Shanghai) +86-(0)755-86170099(ShenZhen) +86-(0)10-62670440(Beijing)
+86-(0)21-61259102(Shanghai) +86-(0)755-86170066(ShenZhen) +86-(0)10-88580358(Beijing) China 40395 62

View Lastest Price from Potassium persulfate manufacturers

Image Release date Product Price Min. Order Purity Supply Ability Manufacturer
2018-12-22 Potassium persulfate
US $2.00 / kg 1kg 99% ask career henan chemical co

Potassium persulfate Spectrum

7727-21-1(Potassium persulfate)Related Search:

Copyright 2017 © ChemicalBook. All rights reserved