SODIUM TRIPOLYPHOSPHATE

PRODUCT IDENTIFICATION

CAS NO.

7758-29-4

 

EINECS NO.

231-838-7

FORMULA

Na₅P₃O₁₀

MOL WT.

367.86

H.S. CODE

2835.31

TOXICITY

Oral rat LD50: 3120 mg/kg

SYNONYMS

Sodium triphosphate; Triphosphoric acid, pentasodium salt;

Sodium Phosphate Tripoly; STPP; Tripolyphosphate de sodium; Pentasodium triphosphate; Pentasodium Tripolyphosphate; Natriumtripolyphosphat; Pentanatriumtriphosphat (German); Trifosfato de pentasodio (Spanish); Triphosphate de pentasodium (French);

DERIVATION

Phosphoric acid with a sodium alkali (usually sodium carbonate)

 

PHYSICAL AND CHEMICAL PROPERTIES

PHYSICAL STATE

white powder

MELTING POINT

620 C (Decomposes)

 

SPECIFIC GRAVITY

> 1.5

SOLUBILITY IN WATER

20% at 25 C

pH

9.7 - 9.8 (1% soln)

 

 

STABILITY

Stable under ordinary conditions

APPLICATIONS

The alkaline phosphates offer detergency activity in combination with the properties of sequestration, dispersion and buffering ability. STPP is used in water softening, industrial cleaners, food uses, detergent, emulsifier of oil and  grease, peptizing agent, deflocculating agent in oil well, sequester in cotton boiling.

SALES SPECIFICATION

H GRADE

APPEARANCE

free flowing white powder

PURITY

96.0% min

P₂O₅

57.0% min

WATER INSOLUBLES

0.1% max

IRON as Fe

0.007% max

WHITENESS

90.0% min

HEAVY METAL as Pb

0.003% max

ARSENIC as As

0.001% max

pH VALUE

9.2 - 10.0

 

G GRADE

APPEARANCE

free flowing white powder

PURITY

90.0% min

P₂O₅

56.0% min

WATER INSOLUBLES

0.1% max

IRON as Fe

0.002% max

WHITENESS

80.0% min

 

FOOD GRADE

APPEARANCE

free flowing white powder

PURITY

95.0% min

P₂O₅

57.0% min

WATER INSOLUBLES

0.05% max

WHITENESS

90.0% min

FLUORIDE as F

0.003% max

CHLORIDE as Cl

0.03% max

SULPHATE as SO₄

0.4% max

HEAVY METAL as Pb

0.001% max

ARSENIC as As

0.0003% max

pH VALUE

9.5 - 10.0

 

PACKING

25kgs in bag