Potassium Metabisulfite CAS 16731-55-8 97% Food Grade

• CAS No.: 16731-55-8
• Formula: H2ko5s2
• EINECS: 200-370-5
• Certification: CCIC, CIQ, RoHS, ISO
• Purity: ≥99%
• Type: Potassium Metabisulfite
• Model NO.: YR-015
• Appearance: Powder
• Grade Standard: Food Grade
• Melting Point: 190
• Model No.: 16731-55-8
• Molecular Weight: 185.241
• MW: 222.32
• Transport Package: 25kg Bag
• Specification: 97%
• Trademark: YR
• Origin: China
• HS Code: 2832200000
• Production Capacity: 500 Metric Tons Per Month

Product Description

Potassium Metabisulfite CAS 16731-55-8 97% Food Grade

Product Description
 

OTASSIUM METABISULFITE Basic information
Product Name:	POTASSIUM METABISULFITE
CAS:	16731-55-8
MF:	K2O5S2
MW:	222.32
EINECS:	240-795-3
POTASSIUM METABISULFITE Chemical Properties
Melting point	190°C
density	2.34 g/cm3
vapor density	2.3 (vs air)
storage temp.	Store at +5°C to +30°C.
solubility	H2O: 0.1 M at 20 °C, clear, colorless
form	Powder/Solid
Specific Gravity	2.3
color	White to slightly yellow
Odor	Odorless
PH	2.5-4.5 (25ºC, 0.1M in H2O)
PH Range	3-4.5 at 22.2 g/l at 25 °C
Water Solubility	Soluble in water. Insoluble in ethanol.
λmax	267nm(H2O)(lit.)
Sensitive	Air Sensitive
Decomposition	150°C
Merck	147,645
EPA Substance Registry System	Disulfurous acid, potassium salt (1:2) (16731-55-8)

Product characteristics: The Product was colorless crystal or white crystalline powder with the relative density of 2.34 .The melting point was 150-190 ºC (decomposition). The product had a flavor of sulfur dioxide and soluble in water with acidic aqueous solution, it was not soluble in ethanol. Sulfur dioxide was released from acidic solution and oxidized to sulfate in the air.


Product Specification



 

Food Grade Potassium Metabisulfite

Food Grade Potassium Metabisulfite use: used in the preparation of photographic developer.Also used as food bleach, preservative, antioxidant;Preservative of wine and fruit juice;Beer clarifiers, fresh fruits and vegetables, meat, grapes preservation, can also be used on cyanide - free silver plating. 

Technical indicators:

Test item	Unit	Specification	Test method
K2S2O5	g/100g	≥97.2	Acc.Fcc IV p.322
SO2	g/100g	≥56.0	To calculate
K2S2O3	g/100g	≤ 0.1	ISO 3629-1996(E)
Na	g/100g	≤ 2	AAS
Cl	g/kg	≤0.5	IC
pH(10% solution)	-	3.8-4.8	RCA/Q-S-066
Pb	mg/kg	≤10	AAS
As	mg/kg	≤1	AAS
Cu	mg/kg	≤1	ICP-AES
Fe	mg/kg	≤5	ICP-AES
Hg	mg/kg	≤0.1	AAS(cold vapour)
Pb	mg/kg	≤1	ICP-AES
Se	mg/kg	≤1	AAS
Zn	mg/kg	≤1	ICP-AES
K2SO3 +K2SO4	mg/kg	allowance	To calculate

Reagent Grade Potassium Metabisulfite:

Standard: Reagent grade overweight potassium sulfite

Reagent grade potassium metabisulfite is a chemical substance with the molecular formula K2S2O5.It is the most commonly used bactericidal and antioxidant excipient in Europe and America, and its SO2 content is 57%.SO2 has the function of anti-oxidation, sterilization and promoting the growth of beneficial microorganisms. In the brewing process of wine, SO2ur dioxide has become an important means to ensure the quality of wine irreplaceable. It has been in the history of wine making for more than 100 years and has been allowed to be added into wine by law. 

Technical indicators:

Test item	Unit	Analysis of pure	Chemically pure
content (K2S2O5)≥	%	95.0	94.0
Clarity test		qualified	qualified
Water insoluble substance ≤	%	0.005	0.02
chloride (Cl)≤	%	0.005	0.01
Pb ≤	%	0.001	0.002
Fe ≤	%	0.0005	0.002
(As) ≤	%	0.0001	0.0003

 

Reagent grade pyrosulfite purpose: Used as analytical reagent. 

 

Photographic Grade Potassium Metabisulfite:

Standard: Photographic grade potassium metabisulfite (ISO 3629-2000)

Properties of photographic potassium metabisulfite: colorless crystal or white crystalline powder.Relative density 2.34.Melting point 150-190ºC (decomposition).It has a smell of SO2 and is soluble in water. Its aqueous solution is acidic and insoluble in ethanol. is emitted from an acidic solution and oxidized to sulfate in the air. 

Technical indicators:

Test item	Unit	Specification	Test method
K2S2O5	g/100g	≥97.2	ANSI PH 4277-1980
SO2	g/100g	≥56.0	To calculate
Aqueous solution properties	-	qualified	ISO 3629-1976(E)
K2S2O3	g/100g	≤ 0.07	ISO 3629-1976(E)
pH(5% solution)	-	3.8-4.6	ISO 3629-1976(E)
Pb	mg/kg	≤10	ICP-AES
Fe	mg/kg	≤5	ICP-AES
And NH3/AgNO3 solution	-	qualified	ISO 3629-1976(E)
K2SO3 +K2SO4	mg/kg	allowance	To calculate

Photographic grade potassium metabisulfite use: used in the preparation of photographic developer. 

Product Packing
25kg/ bag, composite paper bags lined with plastic bags, or according to user's requirements. 



Contact Detalis:
Vanessa Zhao
Senior Business Manager
SHANDONG YURUN CHEMICAL CO.,LTD
Add: Yurun Building,Weifang City,Shandong Province,P.R.China.