Name of index

FCC-IV

E 341(i)

Content(As Ca),   %

15.9-17.7 (Monohydrate)

16.8-18.3 (Anhydrous)

Assay (On the dried basis), ≥95%

P₂O₅ Content(Anhydrous basis) ,%

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55.5—61.1

Description

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Granular powder or white,

deliquescent crystals or granules

Identification

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Positive tests for calcium and for phosphate

CaO content ,%

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19.0—24.8

As, ≤mg/kg

3

3

F, ≤mg/kg

50

30

Lead, ≤mg/kg

2

4

Cadmium, ≤mg/kg

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1

Mercury, ≤mg/kg

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1

Loss on drying, ≤%

1(Monohydrate)

Monohydrate:60°C,1hour then 105°C,4 hours,≤17.5%

Anhydrous:105°C,4hours,≤14%

Loss on ignition

14.0—15.5(Anhydrous)

Monohydrate:105°C,1hour then ignite at 800°C±25°C for 30minutes,≤25.0%

Anhydrous: ignite at 800°C±25°C for 30minutes,≤17.5%