SWASTIK CHEMICALS
Tri Sodium phosphate

Tri Sodium phosphate

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Trisodium phosphate (TSP) is a cleaning agent, lubricant, food additive, stain remover and degreaser. It is a white, granular or crystalline solid, highly soluble in water producing an alkaline solution.

The item of commerce is often partially hydrated and may range from anhydrous trisodium phosphate, Na3PO4, to the dodecahydrate, Na3PO4ยท12H2O. Most often found in white powder form, it can also be called trisodium orthophosphate or simply sodium phosphate. Trisodium phosphate was at one time extensively used in formulations for a wide variety of consumer grade soaps and detergents, but ecological problems have largely ended that practice, at least in the western world.

Uses:-

  • TSP is used as an ingredient in fluxes designed to deoxygenate nonferrous metals for casting.
  • TSP can be used in ceramic production to lower the flow point of glazes.
  • The major use for tri sodium phosphate is in cleaning agents. The pH of a 1% solution is 12, and the solution is sufficiently alkaline to saponify grease and oils.

Specification:-
Table 1 Requirement for Tri Sodium phosphate
(Clause 3.4)

SI no

Characteristic

Requirement for Grade

Method of Test, Ref to Clause No. in Annex A

TECH

Ar

Dodeca- Hydrate

Anhy Drous

(1)

(2)

(3)

(4)

(5)

(6)

i)

Matter insoluble in water, percent by mass, Max

0.2

0.5

0.01

A-2

ii)

Phosphate (as P2O5), percent by mass, Min

17.5

41.01)

18.3

A-3 OR A-42)

iii)

Carbonates (as Na2CO3), percent by mass, Max

---

2

---

A-4

iv)

Carbonate alkalinity (as NaOH), percent by mass, Max

3

---

---

A-5

v)

Free sodium hydroxide (NaOH), percent by mass, Max

---

3.2

2.5

A-6

vi)

Total alkalinity (as NaOH), percent by mass, Max

4.5

---

---

A-7

vii)

Soluble iron compounds (as Fe), percent by mass, Max

0.009

0.02

0.001

A-8

viii)

Nitrogen compound (as N), percent by mass, Max

---

---

0.001

A-9

ix)

Sulphate (as SO4), percent by mass, Max

---

---

0.01

A-10

x)

Arsenic (as As2O3), percent by mass, Max

---

---

0.0005

A-11

xi)

Heavy metal (as Pb), percent by mass, Max

---

--

0.001

A-12

xii)

Soluble silica (as SiO2), percent by mass, Max

0.1

--

0.05

A-13

xiii)

Chloride (as Cl), percent by mass, Max

0.1

--

0.05

A-14