The standard FR series operates at a constant speed of 25 rpm. It is available in two variants, that is to say, with either one (FR 1000) or two test drums (FR 2000). Duration of the test can be selected:

• Revolutions of the drum
• Time

Similar in construction to the fixed speed FR series, the friability series FRV differs only in having variable speed between 20 and 60 rpm. The speed is controlled via the membrane keypad in steps of 1 rpm. The variable speed allows the operator to subject the tablets under test to varying stresses and therefore determine an optimum for each type.

As on the FR series, the duration of the test can be selected in either revolutions of the drum or time.

During the test run, the nominal test duration and remaining test duration, in either revolutions or time, is indicated on the LCD screen, together with the speed.

The control of all models is provided by a membrane keypad linked to a 4-line 20 character back-lit LCD screen.

There are 2 different types of drums available: the standard friability drum and an abrasion drum. All drums are completely interchangeable, i.e. they will fit either side of the FR 2000 / FRV 2000.

Friability drum
For testing the rolling and impact durability of tablets using a single curved baffle which allows the tablets to be tested to rise and then drop through a distance of approx. 156 mm.

Abrasion drum
For carrying out tests into attrition. Small 20 cm diameter drum with a series of baffles which carry the tablets to a predetermined height before sliding off. Reproduces the action of the tablets rubbing against each other during transport.