Clay Hardness

Pfefferkorn Plasticity Measurement Tester

The Pfefferkorn Plasticity Tester is an instrument for evaluating the workability of ceramic materials.

The measurement is based on the falling of a calibrated plate on to an underlying test body, which has previously been shaped using the special forming tool provided with the instrument.

The plasticity tester has two reading scales:

One measures the deformation in mm.

The other determines the deformation of the test body according to the Pfefferkorn tests.

Hardness Tester

The “Payne” Clay Hardness Tester (or Pigsticker) is designed to give an arbitrary value of hardness of clay pugs or pressed clay. Available as two different models, the standard model is used for tableware and general clays. Fitted with a “regular spring” this is the unit that has been supplied for many years. The new CHT005 has been especially developed for use in the heavy clay industries (eg. insulators).

Durometer – DM/34

Instrument devised for determining the penetration depth of a flat headed point on green and pressed ceramic tiles. The basic device is for the production of floor and wall ceramic tiles, with particular reference to single firing. The use of the DM/34 makes daily testing considerably easier. The large stainless steel base allows for central testing of samples up to 400mm x 400mm. Complete with various accessories (5 flat head points of 0.75, 1.00, 1.50, 1.75 and 2.50mm2, a 3kg calibrated spring and a special supporting head) which allow testing on a wide range of materials from very hard to very soft. The unit is supplied with a 1.50mm2 point and a 4kg calibrated spring fitted as standard. Available with either a dial gauge or digital indicator.

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