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Mono/Di/Tri Sodium Phosphate for Mono Sodium Phosphate, Di Sodium Phosphate & Tri Sodium Phosphate Anhydrous

Sodium Phosphate is offered as Mono Sodium Phosphate Di Sodium Phosphate and Tri Phosphate in two grades namely Technical Grade and Extra Pure A. R. Grade.

Sodium phosphate is a generic term for the salts of sodium and phosphate. They are:

Monosodium phosphate (H2NaO4P)
Disodium phosphate (HNa2O4P)
Trisodium phosphate (Na3O4P)

Mono-Sodium Phosphate (NaH2PO4, MSP) , also known as anhydrous monobasic sodium phosphate, is used as a laxative and, in combination with other sodium phosphates, as a pH buffer. The pKa is 7.20. The sodium chloride equivalent value, or E-Value, is 0.49. It is soluble in 4.5 parts water. It is most commonly available as colorless crystals or a white powder. It is insoluble in alcohol.

Specification Mono Sodium Phosphate Crystals Mono Sodium Phosphate Anhydrous
P2O5 Content 44% 59%
Assay 98% 98%
Loss on Drying Less than 24% 1%
Ph of 2% Solution 4.4-5 4.4-5
Insolubles 0.025% 0.5%
Packing 50 Kg HDPE Bags  50 Kg HDPE Bags 

(Na2HPO4, DSP) is a sodium salt of phosphoric acid. It is a white powder that is highly hygroscopic and water soluble. It is therefore used commercially as an anti-caking additive in powdered products. It is also known as disodium hydrogen orthophosphate, sodium hydrogen phosphate or sodium phosphate dibasic. It is commercially available in both the hydrated and anhydrous forms.

Other uses

Disodium phosphate can be used in cream of wheat to quicken cook time. Disodium phosphate is used in conjunction with trisodium phosphate in many steam boiler applications. It supplies the inventory of free phosphates to retard calcium scale formation.

Specification Di Sodium Phosphate Crystals Di Sodium Phosphate Anhydrous
P2O5 content 19% 49.5%
Assay 98% 98.0%
Loss on Drying 57-61% 1%
pH of 2% Solution  8.9-9.5 8.9-9.5
Insolubles 0.025% 0.05%
Packing 50 Kg HDPE Bags  

Sulphate as (NH4)2SO4

0.05% max.

50 Kg HDPE Bags


In 50 Kg HDPE bag with HMHDPE liner

50 Kg HDPE Bags

Tri-Sodium Phosphate (TSP), available at most hardware stores in white powder form, is a cleaning agent, stain remover and degreaser, commonly used to prepare surfaces for painting. It can also be called trisodium orthophosphate and has the chemical formula Na3PO4; however, it is generally found in hydrated forms. It is a highly water-soluble ionic salt. Solutions of it dissolved in water have an alkaline pH.

It can also be found as a food additive; it is used as an acidity regulator (buffering agent), emulsifier, thickening agent, nutrition enlargement agent and sequestrant (metal-chelating agent). In these uses, all sodium phosphates may be collectively referred to as sodium phosphate, or by E number E339. The same is true when sold as an enema, working as a laxative to treat constipation. Sodium phosphate enemas are sold over-the-counter in the United States. However, it should not be confused with the related compounds sodium dihydrogen phosphate, also known as monosodium phosphate or MSP, and disodium phosphate.

Similar chemicals were once common in laundry and dishwashing detergents, but the phosphate, being a fertilizer, would cause algal blooms in the bodies of water that the drains led to. In the early 1970s the use of phosphate-containing products was limited. Now products sold as TSP Substitute, containing 80–90% sodium carbonate, are promoted as a direct substitute.

Cleaning products labeled as TSP may contain other ingredients as well, and may in fact be less than half TSP. So even "regular" TSP found at the hardware store may be half TSP and half "TSP substitute". Some large home improvement centers that sell paint no longer offer TSP.

Although it is the active ingredient in at least one toilet bowl cleaning tablet, TSP is generally not good for cleaning bathrooms, because it can corrode metal.

TSP is commonly used after cleaning with mineral spirits in order to then clean up all the mineral spirits. TSP may be used with household chlorine bleach in the same solution, and this is particularly good for removing mildew from wood. The TSP alone can cause dark stains on redwood, and bleach prevents it.

Also used in various forms as a boiler treatment chemical for calcium precipitation, as well as regulating the caustic effects of disodium phosphate in coordinated phosphate chemistry.

Also used to clean swimming pool polyester filter elements.

For Tri-Sodium Phosphate
Specification Tri Sodium Phosphate Crystals Tri Sodium Phosphate Anhydrous
P2O5 content 19% 49.5%
Assay 98% 98.0%
Loss on Drying Less than 58% 1% max
pH of 2% Solution  11.5-12.5 11.5-12.5
Insolubles Less than 0.025% Less than 0.05%
Packing 50 Kg HDPE Bags  


50 Kg HDPE Bags 50 Kg HDPE Bags

Sodium phosphates are only used as food additives. Sodium phosphates are added to many foods as an emulsifier to prevent oil separation. Some examples are processed cheeses, processed meats, ready-made meals and tinned (canned) soups. Sodium phosphates are also commonly added to powdered soups, boullions and gravy mixtures.

Sodium phosphates can also be used as a leavening agent. Some examples of these foods include the batter coating on breaded fish or chicken, and commercially baked cakes.

Adding sodium phosphates to food increases the shelf life of the food, maintaining the texture and appearance of the food.

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