Light powder HDK N20

HDK N20: Pyrogenic Silica – Fumed Silica ,white colloidal powder of high purity , produced via flame hydrolysis

HDK® N20 is applied as a thickening and thixotropic agent in many organic systems, e.g. in unsaturated polyesters, coatings, printing inks, adhesives, cosmetics and others. It is used as a reinforcing filler in elastomers, mainly silicone-elastomers. HDK® N20 acts as a free flow additive in the production of technical powders, in food and feed and in pharmaceutical products.

 

Typical General Properties

Test Procedure

Unit

Value

SiO2-content (1) DIN EN ISO 3262-­19

%

>99.8

loss on ignition (2) at 1000 oC / 2h DIN EN ISO 3262-19

%

<2

density of SiO2

 g/l

2200

refractive index

1.46

silanol group density

SiOH/nm2

2

electric resistivity (density 40 g/l)

[ Ωcm]

>1013

 

Physical-Chemical Properties

Test Procedure

Unit

Value

Bet-Surface area DIN ISO 9277/DIN 66132

m2/g

170-230

pH, in 4% aqueous dispersion DIN EN ISO 787-9

3.8-4.3

Tamped density DIN EN ISO 787-11

g/l

Ca.40

Loss on drying (3) (2h at 105oC) DIN EN ISO 787-2

%

< 1.5

Sieve residue, acc. To Mocker > 40µm DIN EN ISO 787-18

%

< 0.04

 

1) based on the substance heated at 1000 oC for 2 h

2) based on the substance dried at 105 oC for 2 h

3) ex works

Storage

HDK® N20 has a shelf life of at least 24 months when stored in unbroken original packaging in dry storage areas. The ‘Best use before end’ date of each batch appears on the product label.

 

Packaging

HDKN20: 10kg/bag