WACKER HDK N20 is a hydrophilic fumed silica (170-230m²/g) for rheology control. With >99.8% purity, it enhances flowability and anti-caking in food, coatings and silicone rubbers, available in 10kg bags.
High Purity: >99.8% SiO₂ content (DIN EN ISO 3262-19)
Rheology Control: Effective thickener for paints/adhesives
Food Safety: Compliant with food contact applications
Surface Area: 170-230 m²/g (DIN ISO 9277)
Moisture Resistance: <1.5% water content (105℃)
Easy Dispersion: <0.04% residue (>40μm sieve)
Food Additive: Anti-caking agent in powders
Coatings: Thickener for EP/UP/PU resins
Silicone Rubber: Reinforcing filler for HTV/RTV
Electronics: Battery gel component
Inks: Rheology modifier for printing inks
Silica content | DIN EN ISO 3262-19 | >99.8% |
Loss on ignition (1000°C/2h) | DIN EN ISO 3262-19 | <2% |
Silica density | DIN 51757 | ~2.2 g/cm³ |
Refractive index | - | 1.46 |
Silanol group density | - | 2 SiOH/nm² |
BET surface area | DIN ISO 9277/DIN 66132 | 170-230 m²/g |
pH (4% dispersion) | DIN EN ISO 787-9 | 3.8-4.3 |
Bulk density | DIN EN ISO 787-11 | ~40 g/l |
Loss on drying (105°C,2h) | DIN EN ISO 787-2 | <1.5% |
Residue on sieve (>40μm) | DIN EN ISO 787-18 | <0.04% |
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