"Donna Fill"® (nepheline syenite granite fines) is a by-product of crushing syenite      

granite rock. The production of this material is unique in the fact that it is produced in a controlled manufacturing environment. This provides a cleaner, more consistent grading and angularity process. 

"Donna Fill"®, over the past 35 years has been used as a primary material for highway base and sub-base construction, commercial foundations and airport runways. 

In 1988, through new Federal, State and University Asphalt research and development

projects, "Donna Fill"® was found to be an exceptional material for improving Asphalt Concrete 
Pavements. The addition of granite fines, improves Marshall Stability, % VMA, Shear Values,
film thickness of Asphalt on the aggregates, reduces rutting and improves fine aggregate
angularity.