Fillers

HDK® as a Reinforcing Filler

The reinforcing filler HDK® imparts the requisite mechanical properties to natural and synthetic rubbers and silicone elastomers. Hydrophobic HDK® grades can be used to produce combinations of high filler loading or tear strength with good processability.

Tailored Elasticity

For optimum results, the fillers used in natural and synthetic rubber and silicone elastomers must meet specifications. That is the only way to achieve products with precisely defined mechanical properties, such as tensile strength, elongation at break and tear strength (notch impact strength/Shore hardness). The reinforcing filler HDK® is a preferred auxiliary for achieving the desired system property.

Optimum Reinforcement

HDK® owes its outstanding reinforcing effect to its high specific surface area. The numerous interactions between the polymer chains of the elastomer network and the special particle structure of HDK® dissipates mechanical stresses and forces within the elastomer network – and so restricts the entropy space for polymer chains. This process increases the elastomers’ strength, elongation at break and load-bearing capacity.

High Sag Resistance

HDK® may be added to nonpolar silicone rubber to act both as reinforcing filler and rheological additive. The marked thickening action of hydrophilic HDK® provides the requisite degree of sag resistance, with the result that low-viscosity systems do not run down vertical surfaces.

Good Processability

In silicone elastomers, hydrophilic HDK® provides a high reinforcing effect – but at the same time results in a high viscosity, thereby limiting processability. One solution here is to use processing auxiliaries and low-molecular plasticizers. They block the interaction between the HDK® particles by adsorption and thus lower the viscosity. The system benefits from smooth running and perfect processing.

Your selection resulted in 13 product recommendations.
Products Applicationshow all Product Groupshow all Product Typeshow all Effectshow all BET surface
HDK® H15 Reinforcement of mechanical properties Pyrogenic Silica Hydrophobic Reinforcement 130 - 170 m2/g
HDK® H20 Reinforcement of mechanical properties Pyrogenic Silica Hydrophobic Reinforcement 170 - 230 m2/g
HDK® H2000 Reinforcement of mechanical properties Pyrogenic Silica Hydrophobic Reinforcement approx. 200 m2/g
HDK® H20RH Reinforcement of mechanical properties Pyrogenic Silica Hydrophobic 170 - 230 m2/g
HDK® H30 Reinforcement of mechanical properties Pyrogenic Silica Hydrophobic Reinforcement 270 - 330 m2/g
HDK® H30RM Reinforcement of mechanical properties Pyrogenic Silica Hydrophobic approx. 200 m2/g
HDK® N20 Reinforcement of mechanical properties Pyrogenic Silica Hydrophilic Reinforcement 175 - 225 m2/g
HDK® N20D Reinforcement of mechanical properties Pyrogenic Silica Hydrophilic Reinforcement 175 - 225 m2/g
HDK® T30 Reinforcement of mechanical properties Pyrogenic Silica Hydrophilic Reinforcement 270 - 330 m2/g
HDK® T40 Reinforcement of mechanical properties Pyrogenic Silica Hydrophilic Reinforcement 360 - 440 m2/g
HDK® V15 Reinforcement of mechanical properties Pyrogenic Silica Hydrophilic Reinforcement 130 - 170 m2/g
HDK® V15A Reinforcement of mechanical properties Pyrogenic Silica Hydrophilic Reinforcement 130 - 170 m2/g
HDK® V15D Reinforcement of mechanical properties Pyrogenic Silica Hydrophilic Reinforcement 130 - 170 m2/g

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