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Thickener:

White powder

pH (5% solution) 5.5 - 7.5

Fineness%, by 320

Mesh sieve ≥ 98

Loss on drying (105 ℃)% ≤ 10

Loss on ignition (900 ℃)% ≤ 8.3

Sulfate% ≤ 0.4

Chloride% ≤ 0.1

Whiteness WG,% ≥ 93

Water absorption ml/20g54 ~ 60

SiO2 content% ≥ 96

Fe% ≤ 0.02

Refractive index (20 ℃) 1.435 ~ 1.460

Apparent density g/ml0.15 ~ 0.20

Heavy metals (as Pb) mg / kg ≤ 20

Arsenic mg / kg ≤ 2

Total bacterial Cfu / g ≤ 200

Friction-type:

White powder

pH (5% solution) 6.5 - 8.5

Fineness through 320

Mesh sieve ≥ 98

Loss on drying (105 ℃)% ≤ 10

Loss on ignition (900 ℃)% ≤ 8.3

Sulphate (Na + Na)% ≤ 0.4

Chloride% ≤ 0.1 Whiteness WG,% ≥ 93

Water absorption ml/20g17 ~ 20

SiO2 content% ≥ 96

Fe% ≤ 0.02

Refractive index (20 ℃) 1.435 ~ 1.460

Apparent density g / ml ≥ 0.30

Heavy metals (as Pb) ppm ≤ 20

Arsenic ppm ≤ 2

Total bacterial Cfu / g ≤ 200

Mixed type:

White powder

pH (5% solution) 6.5 - 8.5

Fineness through 320

Mesh sieve ≥ 98

Loss on drying (105 ℃)% ≤ 10

Loss on ignition (900 ℃)% ≤ 8.3

Sulphate (Na + Na)% ≤ 0.4

Chloride% ≤ 0.1 Whiteness WG,% ≥ 93

Water absorption ml/20g30 ~ 42

SiO2 content% ≥ 96

Fe% ≤ 0.02

Refractive index (20 ℃) 1.435 ~ 1.460

Apparent density g / ml ≥ 0.30

Heavy metals (as Pb) ppm ≤ 20

Arsenic ppm ≤ 2

Total bacterial Cfu / g ≤ 200