The Philippine Journal of Science 



Constants of pure bitumen of Leyte. 

 Physical constants: 



Melting point (capillary) (° C.) 



Specific gravity at 25° C. (77° F.) 



Ductility 



Penetratioi 

 Chemical 



Ethyl acetate soluble (paraffins) 



Ethyl acetate insoluble (asphalt) 



Mineral matter 



Volatile matter at 265° C. 



Fixed carbon 



