PSA Backing Plates

Professional PSA (Pressure Sensitive Adhesive) backing sets for flat lap machines, lapidary grinding systems, and horizontal disc sanders. PSA backing sets provide a smooth, flat, durable foundation for mounting PSA-backed diamond sanding discs, micron-graded lapping film discs, and polishing pads. Simply peel the protective liner from the PSA disc and press firmly directly onto the backing plate for instant, slip-free mounting. Available in convenient 6" and 8" 5-piece sets designed for rapid stage setups.

Available Sizes & Pricing

Product Size Pack Quantity Price
PSA Backing Set 6" (150mm) 5pcs $8.00
PSA Backing Set 8" (200mm) 5pcs $10.00

PSA vs Magnetic Backing — Which to Choose

Feature PSA Backing Magnetic Backing
Disc change speed Peel & stick — deliberate Instant tool-free — immediate
Best workflow Fixed single-grit setups, extended single-stage lapping Multi-grit workflows, frequent disc transitions
Initial cost Highly economical Higher initial investment
Disc compatibility PSA adhesive-backed discs only Magnetic rubber / steel-backed discs only
Adhesive residue Minimal adhesive cleanup on disc removal Zero residue

Compatible PSA Discs & Polishing Media

Related Mounting Accessories

Frequently Asked Questions

  • Q: What does PSA mean on a backing plate?
    A: PSA stands for Pressure Sensitive Adhesive. PSA backing sets are precision-surfaced discs engineered to receive peel-and-stick abrasive discs and polishing pads. The abrasive disc features a pre-applied pressure-sensitive adhesive coating that forms a high-strength bond upon direct, even contact with the backing plate without requiring heat, glue, or specialized clamping tools.
  • Q: Can I reuse a PSA backing plate after removing a worn disc?
    A: Yes. Carefully peel the spent disc starting from an outer edge. Wipe away any trace adhesive residue using a rag dampened with isopropyl alcohol or mineral spirits. Once dry, the backing plate is immediately ready to accept a fresh PSA disc.
  • Q: Should I choose PSA or magnetic backing for my flat lap machine?
    A: Select PSA backing if you maintain dedicated grinding stations or run extensive single-grit lapping runs where maximum economy is desired. Choose magnetic backing systems if you frequently progress through multiple grits on a single machine platen, as magnetic discs swap in seconds without adhesive maintenance.
  • Q: What is the advantage of a 5-piece PSA backing set?
    A: A 5-pack allows you to mount five distinct grit stages (e.g., 80#, 220#, 600#, 1200#, and a final polish felt pad) onto separate dedicated backing discs in advance. This enables fast, clean transitions between stages during production cabochon grinding or facet pre-polishing.