Inorganic Salts

Potassium Carbonate

Chemical name: Potassium carbonate
Molecular formula: K2CO3
Molecular weight: 138.21
CAS No.: 584-08-7

Potassium Carbonate, K2CO3, CAS 584-08-7, is supplied against both GB 25588-2010 and FCC VII. The anhydrous form is a white granular powder and the hydrated form a white translucent crystal or granule; both are odourless with an alkaline smell, freely soluble in water giving an alkaline solution, and insoluble in ethanol or ether. It is very deliquescent in air, which is the single most important thing to plan storage around. In noodle and wonton processing it gives the product its characteristic flavour, colour and resilience.

Why buyers specify this grade

Dual specification, GB 25588-2010 and FCC VII, so one material serves Chinese and FCC-referencing markets
Content 99.0% min under GB, 99.0-100.5% under FCC VII
Arsenic 2 mg/kg max and iron 0.0010% max under the GB specification
Gives noodles and wonton wrappers their distinctive flavour, colour and resilience
Packed 25 kg net in a polyethylene inner bag with a compound plastic woven outer bag

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Specification

Content as K2CO3, GB 25588-2010	99.0% min
Content as K2CO3, FCC VII	99.0 - 100.5%
Arsenic	2 mg/kg max
Sulfur compound as K2SO4	0.01% max
Iron as Fe	0.0010% max
Heavy metals as As and Pb	10 mg/kg max
Lead, FCC VII	2 mg/kg max
Insoluble substances	0.02% max
Chlorides as KCl	0.015% max
Loss on ignition	0.60% max GB, 1.00% FCC at 180 deg C 4 h

Technical data

Chemical name: Potassium carbonate
Molecular formula: K2CO3
Molecular weight: 138.21
CAS No.: 584-08-7
Character: Anhydrous or 1.5 hydrate; deliquescent in air
Solubility: Freely soluble in water, alkaline solution; insoluble in ethanol or ether

Quality control

Released against both GB 25588-2010 and FCC VII columns as shown above
TDS and MSDS issued with the order, sample COA on request

Where it is used

pH regulator, nutrient and processing aid in food
Noodle and wonton processing for flavour, colour and resilience
Spice and seasoning applications
General alkaline processing where an ethanol-insoluble carbonate is wanted

Who buys it

Noodle and wonton manufacturers
Food processors using alkaline pH regulators
Seasoning and spice blenders
Buyers specifying against FCC VII

Problems it solves

Noodles lacking the expected bite, colour and aroma without an alkaline salt
Caking in the bag because a deliquescent carbonate was stored in a humid warehouse
Reconciling GB and FCC specifications when selling into two markets
Insoluble residue and chloride carry-over from a lower-grade carbonate

Packing and options

Anhydrous or hydrated form specified at order
25 kg net bags, polyethylene inner layer with compound plastic woven outer bag

How it compares

Sodium carbonate is cheaper but puts sodium rather than potassium into the product and gives a different flavour and texture in noodle processing. Potassium carbonate is the one specified where the traditional noodle character, or the potassium contribution itself, is the objective.

Handling and storage

Store in a dry, ventilated warehouse away from heat and moisture, the material is very deliquescent
Keep away from poisonous substances in storage and unload with care to avoid bag damage
Add at the proper dosage in noodle and wonton processing to develop flavour, colour and resilience

FAQ

Potassium Carbonate questions buyers ask

Which specification do you supply against

Both GB 25588-2010 and FCC VII. Content is 99.0% min under GB and 99.0-100.5% under FCC VII.

Anhydrous or hydrated

Both forms are available. Anhydrous is a white granular powder, the hydrated form is a white translucent crystal or granule containing 1.5 hydrates.

Why does it cake in storage

It is very deliquescent in air. Store in a dry, ventilated warehouse and keep bags sealed and away from moisture in transit.

What is it used for in food

As a pH regulator, nutrient, processing aid and spice. In noodle and wonton processing it gives unique flavour, colour and resilience.

How is it packed

A polyethylene inner bag inside a compound plastic woven outer bag, 25 kg net weight per bag.

What are the heavy metal limits

Arsenic 2 mg/kg max, heavy metals as As and Pb 10 mg/kg max under GB, and lead 2 mg/kg max under FCC VII.

Download TDS, MSDS and sample COA