This apparatus is used for determining the hardness number of Mastic Asphalt for flooring. It comprises of an internally insulated cabinet to the base of which is fitted with a water bath whic consist of two taps. The bath is warmed by an immersion heater and the temperature is controlled with the thermostat at 35? +/- 0.5? C. A 6.5mm dia pin is loaded on the specimen by means of a lever to give a 31.7 Kg weight. A dial gauge 0.01 x 25 mm is provided to record the penetration of pin into the samples.
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