104 PAINT TECHNOLOGY AND TESTS 



Adhesive Power. " The adhesion of the linoxin to the coarse 

 group of particles and to the underlying material is vital to the 

 life of the paint coating. If the coating parts from the surface 

 beneath, we have scaling or peeling. It is universally admitted 

 that this will result from use of zinc oxide as the sole pigment. 

 We have only to conceive of our flat arch of reinforced linoxin 

 and leave out our points of support, to realize that this is the 

 inevitable result if the coating be subject to extreme exposure, 

 although good results may be obtained from zinc oxide used alone, 

 as, for instance, in interior house painting where extreme changes 

 of temperature and exposure are avoided. 



" Three major lines of force hold our linoxin in place adhesion 

 toward the underneath surface, adhesion to the coarse particles, 

 and cohesion within the linoxin itself. These lines must be 

 represented by a flat arch of linoxin with a downward pointing 

 magnet therefrom, to represent adhesion to the surface. Mag- 

 nets on each side of the arch pointing toward the supporting 

 coarse particles, and two magnets within the arch and pointing 

 toward each other, or to the centre of the arch, these latter to 

 represent the force of cohesion." 



