Fiberboards 



60 



2773 



ROSIN SIZE _ 



100 150 200 



DRYING TEMPERATURE CF) 



250 



Figure 23-23. — Effect of drying temperature on the effectiveness of wax size, as mea- 

 sured by the ink flotation test. Longer time = better sizing. (Drawing after Cobb and 

 Swanson 1971.) 



Table 23-4. — Physical and chemical properties of two types of wax sizes (Porter 1971) 



Property Acid-stable Non-acid-stable 



Total solids, percent by weight 40 to 55 40 to 65 



Density, pounds/gallon 7.6 to 8. 1 7.6 to 8. 1 



pH 5 to 8 8 to 1 1 



Particle size, average, microns 1 0.5 



Color White, off-white White, off-white 



Stability 



Alum Stable Unstable 



Alkali Stable Moderately stable 



Mechanical Good Good 



Temperature 



Above 32°F Stable Stable 



Below 32°F Unstable May be stable 



Storage 3 to 6 months 3 to 6 months 



