Aguilar: Linseed and Lumbang Oils 



241 



linseed oil, does not show this phenomenon. The paint made 

 with lumbang banucalag oil and red lead, painted on a smooth 

 surface, did not dry in twelve days, probably because a very thin 

 layer of the exposed surface dried in a very short time, thus 

 preventing the action of the atmosphere upon the underlying 

 paint. This property makes banucalag undesirable as a paint 

 vehicle when used alone. However, by mixing 1 part of lum- 

 bang banucalag with from 1 to 3 parts of lumbang bato, a quick- 

 drying and altogether satisfactory paint is obtained. 



Table V shows the variation in the tensile strength of paint 

 films made from mixtures of lumbang oils. 



Table V. — Tensile strength of red lead paint films. 









Breaking 



strength in terms 

 of centimeters of 



Stretches in centi- 

 meters, after— 





No. 



Oils used. 



Per 

 cent. 



mercury, after — 





General remarks. 



10 

 days. 



30 

 days. 



60 

 days. 



10 30 

 days. days. 



60 

 days. 



T 





100 



26.3 



34.0 



38.0 



1 

 0.27 ! 0.26 ' 0.29 



















| 



hours. Appearance 

















good. 



2 



Lumbang bato._ 



100 



10.8 



17.4 



20.5 0.25 



0.28 



0.29 



Film was dry in 48 

 hours. Appearance 



3 



[Lumbang bato 



1 Lumbang banucalag . 



90 

 10 



] 10. 2 | 15.7 



15.5 



0.25 



0.24 



0.24 



good. 

 Do. 



4 



J Lumbang bato 



1 Lumbang banucalag _ 



75 

 25 



Jl2.4 17.6 



17.1 



0.32 



0.31 



0.26 



Film was dry in 24 

 hours. Appearance 



5 



|Lumbang bato 



1 Lumbang banucalag . 



50 

 50 



ll2.4 1 18.0 



18.4 | 0.30 



0.35 



0.33 



good. 

 Do. 



6 



J Lumbang bato 



1 Lumbang banucalag . 



25 



75 



J-16.1 j 20.2 



21.2 



0.25 



0.22 



0.21 



Film was not dry in 6 

 days. The surface 

 was dull. Paint 

















dried into a paste in 





















the container in a 



7 





10 

 90 



}l4.2 



« 



« 



0.24 



0.27 



0.25 



short time. 

 Film was not dry in 9 

 days. The surface 



1 Lumbang banucalag . 





















was also dull. Paint 





















dried into a paste in 





















the container in a 





















short time. 



The above results indicate that the mixtures of lumbang oils 

 attain their maximum strength more quickly than either linseed 

 or lumbang bato. Judging from the general behavior and ap- 

 pearance of the paints, mixtures 4 and 5, that is, mixtures with 

 lumbang banucalag containing 50 to 75 per cent lumbang bato, 



