The Universal Selection Source: Adhesives Ingredients

by SpecialChem


Technical DataSheet | Supplied by Wacker

HDK® H20RH by Wacker is a hydrophobic silica that has been treated with alkylsilane. Acts as a rheological modifier. Possesses excellent storage stability in basic systems and is ideal as a thickening agent for use in amine hardeners of two-component adhesives and jointing compounds. The silicone-fluid-free additive features exceptional rheological activity in polar systems and prolongs the shelf life, even at high pH values. Further application fields of HDK® H20RH include automotive adhesives and half-shell bonding in wind turbines. It is a white, amorphous powder of low density and large specific surface area. Can give jointing compounds favorable pull-off characteristics. It also features good wetting properties.

HDK® H20RH Product details

Product Type
Chemical Composition
Physical Form
Product Launch Date
Product Status
Applications/ Recommended for
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HDK® H20RH Properties


Value & Unit
Test Condition
Test Method
SiO2-content, DIN EN ISO 3262-19
xxxxxx %
Density of SiO2
xxxx g/l
Silanol group density
xxxxx SiOH/nm2
Electric resistivity (density 40 g/l)
xxxxxxxxxx Ω cm]
BET-surface area of the hydrophobic silica, DIN ISO 9277/ DIN 66132
xxxxxx m2/g
Carbon content
xxxx %
pH, in 4 % dispersion, 1:1 mixture of water-methanol, DIN EN ISO 787-9
Tamped density, DIN EN ISO 787-11
xxxxx g/l
Last edited Feb 13, 2017
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