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TECHNICAL DATA OF PRECIPITATED SILICA (Kad-Sil) 
GRADE : KSL – 5 (Tooth Paste Grade - Ordinary and Medicated)
Sr. No. CHARACTERISTICS   REQUIREMENT
1 Description Fine, White, free from dirt/black specs and non gritty powder
2 Moisture % by Mass @ 105c for 1 hour  5.0 
3 Loss on ignition @ 850c for 1 hour  5.0 - 7.0
4 Bulk Density Compact (After 50 Taps)-gm/ml 0.1 - 0.12
5 pH 5% Aqueous Slurry 6.5 - 7.5
6 Assay % by Mass before ignition (Min) 88.0 - 90.0
7 Assay % by Mass after ignition ( Min) 99.5
8 Iron (as Fe+++) ppm Max.  200
9 Sulphate (as SO4 ) ppm Max.  350
10 Chloride (as C1 ) ppm Max.  300
11 Arsenic (as As) ppm Max. Nil
12 Lead (as Pb) ppm Max. Nil
13 Retention on 300 Mesh - % by Mass (Max)  0.5
14 Sorbitol(70%) Absorption (Value gm/100gm – Min.)  250
15 Color of Sorbitol Slurry Colourless
16 Average Particle Size 3 mm

   
GRADE : KSL – 5T (Tooth Paste Grade - Gel Type)
Sr. No. CHARACTERISTICS   REQUIREMENT
1 Description Fine, White, free from dirt/black specs and non gritty powder
2 Moisture % by Mass @ 105c (Max.) 5.0
3 Loss on ignition @ 850c for 1 hour - % (Max.) 5.0 - 7.0
4 Bulk Density Compact (After 50 Taps)-gm/ml 0.9 - 0.10
5 Water Absorption (gm/100 gm) (Min) 250
6 pH 5% Aqueous Slurry 6.5 - 7.5
7 Assay % by Mass before ignition (Min) 88.0 - 90.0
8 Assay % by Mass after ignition ( Min) 99.5
9 Iron (as Fe+++) ppm Max.  250
10 Sulphate (as SO4 ) ppm Max.  350
11 Chloride (as C1 ) ppm Max.  300
12 Arsenic (as As) ppm Max. Nil
13 Lead (as Pb) ppm Max. Nil
14 Retention on 300 Mesh - % by Mass (Max)  0.5
15 Color of Sorbitol Slurry Colourless
16 Average Particle Size 15 mm

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