EVALUATION OF WOOD PRESERVATIVES 



145 



Table II — Analyses of Creosote BTL No. 5340, 

 Water-Free Basis 



Specific gravity 



38/15.5°C 



Distillation, per cent, cumulative 



to 210°C 



210-235 



235-270 



270-300 



300-315 



315-355 



Residue above 355°C 



Total 



Sulph. res., gm/100 ml, 

 Tar acids, gm/100 ml . , 

 Benzol insol., per cent. 

 Specific gravity 



(38°C) 235-315°C.. . . 

 315-355°C 



* Average of 2 analyses. 



It should be noted that the retentions are calculated as averages for the 

 respective charges. Attention is called to the small quantity of preserva- 

 tive material involved. Even in calculated retentions of creosote, for 

 example, 9.40 pounds per cubic foot (Table I), the retention means 1.05 

 grams in the whole block, or 0.163 grams in each cc of block volume. In 



0.40 



o 



u- 0.36 



0.32 



0.28 



0.24 



0.12 



0.08 



2 



^ 0.04 



2 4 6 8 10 12 14 16 18 20 22 24 26 



PENTA PETROLEUM CONCENTRATION IN PER CENT IN TREATING SOLUTION 



Fig. 5— Gradient retention of pentachlorophenol, calculated for the material 

 alone, without the oil carrier. See Fig. 4. 



