The term “purple sandpaper” has long represented the high-performance tier of the abrasive market, typically associated with fast-cutting ceramic or premium alumina grains. However, the next evolution of this standard isn’t just about the grain—it’s about the backing. Fuji Star’s AF Film Series takes the “purple” performance standard and enhances it with Japanese film technology.
Traditional purple paper products often suffer from edge-wear and grain shedding when used on sharp contours. The Fuji Star AF39M Film solves this by replacing the paper foundation with a tear-resistant polyester film. This allows the abrasive to perform with the aggression of “purple” products while maintaining the durability needed for heavy-duty metal deburring or hardwood leveling.
One of the hallmarks of premium purple abrasives is their anti-loading capability. Fuji Star elevates this with a specialized Multi-Layer Stearate Coating.
The AF37M is specifically engineered for “soft” coatings (like UV primers and fresh clear coats), where standard purple paper might clog.
The film backing stays cool, preventing the resin from reaching its glass transition temperature and “gumming up” the abrasive.
| Feature | Standard Purple Paper | Fuji Star AF Series (Film) |
|---|---|---|
| Grain Type | Premium Alumina / Ceramic | Specialized Heat-Treated Alumina |
| Backing Strength | Moderate (Tears under tension) | High (Tear-resistant PET) |
| Surface Flatness | Low (Paper fibers present) | Absolute (75μm Calendered Film) |
| Wet Sanding | Limited (Paper swells) | Fully Waterproof |
While the industry recognizes the value of “purple sandpaper,” professionals seeking the ultimate in finish quality are migrating to the Fuji Star AF37M/38M/39M series. By combining the aggressive cutting power of premium grains with the microscopic flatness of Japanese-engineered film, we deliver a surface finish that paper products simply cannot replicate.
