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Sodium acid pyrophosphate (SAPP) Disodium diphosphate

SODIUM ACID PYROPHOSPHATE, SAPP, Disodium pyrophosphate, Disodium diphosphate, Disodium dihydrogen pyrophosphate, Acid sodium pyrophosphate

CAS Number: 7758-16-9 

EC / List no.: 231-835-0
CAS no.: 7758-16-9

Sodium acid pyrophosphate (SAPP), or Disodium diphosphate, is a condensed phosphate formed when sodium orthophosphate is heated to remove the water. 

Sodium acid pyrophosphate (SAPP) is expressed by the formula Na2H2P2O7 and is composed of 20.72% Na, 19 0.91% H, 27.91% P, and 50.46% O.

Application of SAPP Sodium Acid Pyrophosphate /Disodium diphosphate in Industrial Fields:

Sodium Acid Pyrophosphate, SAPP, can be used in leather processing to remove iron stains from raw hides during processing. 

Sodium Acid Pyrophosphate, SAPP, can stabilize the hydrogen peroxide solution against reduction.

Sodium Acid Pyrophosphate / SAPP can be used with sulfamic acid for cleaning, especially soapstone removal in specific dairy applications.

In oil production, Sodium Acid Pyrophosphate can be used as a dispersant for oil well drilling mud.

In leather treatment, Sodium Acid Pyrophosphate /Disodium diphosphate can remove iron stains on hides during processing. 

Sodium Acid Pyrophosphate /Disodium diphosphate can stabilize hydrogen peroxide solutions against reduction. 

Sodium Acid Pyrophosphate /Disodium diphosphate can be used with sulfamic acid in some dairy applications for cleaning, especially to remove soapstone. 

When added to scalding water, it facilitates the removal of hair and scurf in hog slaughter and feathers and scurf in poultry slaughter. 

Sodium Acid Pyrophosphate can be used as a dispersant in oil well drilling muds in petroleum production.

Sodium Acid Pyrophosphate is used in cat foods as a palatability additive.

Disodium pyrophosphate is used as a tartar control agent in toothpaste.

Sodium acid pyrophosphate (SAPP) Disodium diphosphate is used in industrial contexts, particularly in water treatment operations, in addition to the culinary world. Because of its ability to sequester metal ions, it can effectively prevent corrosion and scale formation in water systems, increasing their longevity and operational efficiency.

Substance names and other identifiers

Regulatory process names
Diphosphoric acid, disodium salt

Disodium dihydrogenpyrophosphate

EC Inventory
disodium dihydrogenpyrophosphate

IUPAC names
Dihydrogenopyrophosphate de disodium

Diphosphoric acid, disodium salt

Diphosphorsäure, Dinatriumsalz

disodium [hydroxy(oxido)phosphoryl] hydrogen phosphate

disodium dihydrogen (phosphonatooxy)phosphonate

Disodium dihydrogen diphosphate
disodium dihydrogen diphosphate

disodium dihydrogen pyrophosphate

Disodium dihydrogenpyrophosphate

disodium dihydrogenpyrophosphate

Disodium dihydrogenpyrophosphate

disodium dihydrogenpyrophosphate

disodium;[hydroxy(oxido)phosphoryl] hydrogen phosphate

Sodium acid pyrophosphate

sodium acid pyrophosphate

Sodium acidpyrophosphate

Sodium acidpyrophosphate

Trade names


diphosphoric acid disodium salt

disodium diphosphate

Disodium pyrophosphate

disodium pyrophosphate



Natriumpyrophosphat, sauer


Prayphos SAPP Fin, LI, SAPP 180 FG






Sodium acid pyrophopshate (SAPP)


Sodium Acid Pyrophosphate

Sodium acid pyrophosphate

Sodium Acid PyroPhosphate 15

Sodium Acid PyroPhosphate 28

Sodium Acid Pyrophosphate 28, semigranular

Sodium Acid Pyrophosphate 40

sodium pyrophosphate dibasic


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