ABSORPTION AND PENETRATION OP COAL TAR AND CREOSOTE. 27 



Specific gravity, 1.0576 at 60° C. The index of refraction values and the distillation 

 curve indicate that the oil is a pure coal-tar creosote. 

 Creosote No. 4-— The distillation is as follows: 



Temperature. 



Distillation. 



°C. 

 205 



Per cent. 



1.2 

 22.7 



5.7 



9.9 

 11.5 

 27.6 

 20.9 



0.5 



235 



245 



275 



305 



360 



Residue 



Loss 



Total 



100.0 





Specific gravity, 1.071 at 60° C. The indices of refraction at 60° C. are very low 

 for a pure coal-tar creosote. The sulphonation values are low, yet are an indication 

 of the presence of petroleum oils. The residue is a soft sticky pitch and indicates 

 the presence of undistilled tar probably less than 5 per cent. From the appearance 

 and physical properties of the fractions the creosote behaves very much like a mixed 

 creosote. 



Creosote No. 5. — The distillation is as follows: 



Temperature. 



Distillation. 



°C. 

 205 



Per cent. 

 1.3 



2.2 



1.8 



7.1 



14.2 



40.4 



32.8 



0.2 



235 



245 



275 



305 



360 



Residue 



Loss 



Total 



100.0 





