The DD 3 drive is microprocessor controlled and uses a stepping motor and a feed rod.

Both are located outside the tempering bath and therefore are not affected by corroding influences of the bath liquid.

The tempering bath itself is double-walled with an outer water circulation system. The tractor cradle is made of stainless steel as well as the bath walls.

If extremely thin threads are measured, the built-in circulation pump for the inner bath can be switched off.

A very even and exact temperature can be obtained in the bath by the connection of a good coolant circulator and due to several thermometers plus the transparent bath cover.

These models have a digital indication of the elongation.

The ductility meters are also available as DDA 3 in an automatic version with force measurement.

The Ductility or Elongation:
is measured by the distance to which a sample will elongate before breaking when two ends of a specimen briquette are pulled apart at a specified speed and at a specified temperature. It may be used for quality specifications.

The Elastic Recovery:
is measured by the recoverable strain determined after a specified time after severing an elongated briquette specimen.

The specimens are pulled to a specified distance at a specified speed and at a specified temperature, cut apart and after a specified time of recovering the reduction in relation to the total distance is measured.

This is useful in confirming that a material has been added to the asphalt to provide a significant elastomeric characteristic.

Ductilometer Test Equipment

to be composed of:

- Semi-automatic Ductilometer - DD 3
- Circulator for external & internal heating & cooling
- Hose-Set for circulator
- Digital Stop Watch