Treatability

The evaluation of treatability is based on the rate of absorption of preservative when test specimens of standard dimensions are subjected to an open-tank treatment using a mixture of 50% creosote and 50% diesel oil heated to a temperature of 87癈 in 2 1/2 hours and maintained at this temperature for 1 hour before cooling to room temperature over a period of 16 hours. It has been found convenient to classify treatability into seven groups as shown in the Treatability Grouping below.

		     Treatability Grouping
________________________________________________________________________
	Grouping			Absorption Range

	Extremely Easy			greater than 320 kg/m3
	Very easy			190 - 320 kg/m3
	Easy				130 - 190 kg/m3
	Average				95 - 130 kg/m3
	Moderately Difficult		65 - 95 kg/m3
	Difficult			30 - 65 kg/m3
	Very Difficult			less than 30 kg/m3
________________________________________________________________________