#	Criteria	Specification
1	Appearance	Free flowing white powder without any visible contamination
2	Odour	The material should have no noticeable malodour
3	P2O5 - content as is	56% Min
4	STPP - content as is	94% Min
5	Other Phosphates	6% Max
6	Temperature Rise Test (TRT)	10-14°C
7	Phase I Content	16-32%
8	Volatile Matter (loss at 135°C - 4h)	0.5-1%
9	Insoluble matter in water	0.1% Max
10	Sodium Sulphate Content	1.5% Max
11	Sodium Chloride Content	0.5% Max
12	Fluoride Content	0.3% Max
13	Colour values: L a b	95 Min -2.5 - 2.5 0 - 5
14	Bulk Density	700 - 1000 g/l
15	R.O.H: After 1mn After 5 mn	81-88°C 85-92°C
16	Particle Size: >1000 microns >500 microns >150 microns >60 microns	0.2% Max 2% Max 15% Max 50% Max
17	pH (1% solution)	9.4 - 10.2
18	Trace Metals: Cr Co Ni Fe Mg + Ca	5 ppm Max 5 ppm Max 5 ppm Max 100 ppm Max 150 ppm Max