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Dynabrade DynaCut Extreme 5 inch sanding disc is a 320 grit PSA no hole aluminum oxide on film sanding disc that levels and finishes surfaces where a fine cut and consistent scratch pattern are needed. The premium P graded aluminum oxide abrasive cuts aggressively while maintaining a uniform finish, so sanding stays controlled across panels and edges. The high performance 3 mil film backing supports the abrasive grain during use, so the disc stays flat and resists tearing as you work. The film backing also helps the disc maintain contact on curved or contoured parts, so the finish remains even in those areas. The pressure sensitive adhesive (PSA) sticks the disc firmly to vinyl face back-up pads, so the disc remains stable during sanding and does not shift under load. When the disc is worn, the adhesive releases cleanly from the pad, helping keep changeovers straightforward between grits or fresh discs.
This aluminum oxide on film sanding disc uses a pressure sensitive adhesive to mount directly to vinyl face back-up pads, so installation is a simple press-on operation that locks the disc flat to the pad. The 5 inch no hole layout presents a continuous abrasive surface, so there are no hole edges to catch on the workpiece during passes. The 3 mil film backing keeps the disc dimensionally stable on the pad, so the abrasive face tracks true across the surface while the tool runs. When sanding is complete or the abrasive is spent, the PSA bond is designed to release from the vinyl pad without heavy residue, so the pad surface stays uniform for the next disc and the sander can return to use quickly.
The DynaCut Extreme 320 grit PSA no hole design presents uninterrupted abrasive across the 5 inch face, so fine finishing passes cover the full pad diameter without breaks in the scratch pattern. The premium P graded aluminum oxide abrasive delivers a fast but controlled cut at this fine grit, so it can refine previous sanding steps while still handling small surface corrections. The extremely tough 3 mil film backing holds up as the disc works near edges or seams, so the abrasive remains bonded even when part contours change. This backing also resists tearing forces when the operator overlaps passes or works near cutouts, supporting a consistent finish from start to end of the disc life. Because the clog free coating is pigment free, fine dust is less likely to bond to the disc surface, allowing the abrasive to stay exposed to the work surface. This buildup resistant behavior helps sustain the cutting rate over longer runs, especially on materials that tend to load abrasives. The coating also avoids adding color to the work surface, so the disc focuses solely on cutting the existing material rather than leaving colored residue.
The high performance 3 mil film backing creates a stable base beneath the aluminum oxide grain, so the disc remains flat on the vinyl face back-up pad and tracks smoothly across the workpiece. That stability helps reduce uneven contact, supporting a uniform scratch pattern across wide panels and smaller parts. The film backing is described as extremely tough and tear resistant, so discs stay productive longer even in areas where paper-backed discs can fail. Fewer tears help extend usable life, allowing the operator to cover more surface area before changing discs. The pressure sensitive adhesive bond is formulated to adhere firmly to vinyl face pads, so the disc does not slip during use and torque from the sander transfers directly into the abrasive cut. When the disc is worn out, the PSA removes cleanly from the pad, so the pad face stays ready for another disc without extra scraping time. This clean release supports repeated changes between grits or fresh discs, helping keep sanding sequences moving with minimal interruption.
This Dynabrade DynaCut Extreme disc uses premium P graded aluminum oxide, so the abrasive cuts quickly while maintaining a uniform scratch for controlled finishing work.
The 3 mil film backing is extremely tough and tear resistant, so the disc stays intact longer during edge work and maintains consistent contact across the pad face.
The proprietary clog free pigment free coating creates a buildup resistant surface, so abrasive grains stay exposed and the disc continues cutting instead of loading with dust.
The pressure sensitive adhesive adheres firmly to vinyl face back-up pads, so the disc stays secure during sanding and transmits tool motion directly into the cut.
The PSA is designed to remove cleanly when discs are worn out, so the pad surface remains ready for a new disc without added cleanup steps.
The 320 grit DynaCut Extreme disc provides a fine abrasive cut, so it refines surfaces while the premium aluminum oxide and film backing support long, consistent performance.
The DynaCut Extreme 5 inch no hole PSA aluminum oxide on film sanding disc brings together premium P graded abrasive, a tough 3 mil film backing, and a clog free pigment free coating, so each disc is built for fast cutting with extended life in demanding shop conditions. The pressure sensitive adhesive bond to vinyl face back-up pads secures the disc during sanding and releases cleanly when worn, so disc changes stay efficient across a full sanding sequence. For work that benefits from a fine 320 grit scratch and long running film backed performance, this Dynabrade 91533 disc from Wurth Baer Supply aligns well with professional and serious DIY sanding workflows.
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