PSA Backing Plates

PSA Backing Plates – Pressure Sensitive Adhesive Backing Plates for Diamond Sanding Discs & Flat Lap Machines

Professional PSA (Pressure Sensitive Adhesive) backing sets for flat lap machines, lapidary grinding systems, and angle grinders. PSA backing sets provide a stable surface for mounting PSA-backed diamond sanding discs, lapping film discs, and polishing pads — simply peel the protective liner from the PSA disc and press directly onto the backing plate for instant, secure mounting. Available in 6" and 8" 5pcs sets.

🔥 Shop PSA Backing Plates – From $8.00

Available Sizes & Pricing

Product Size Pack Price
PSA Backing Set 6" 5pcs $8.00
PSA Backing Set 8" 5pcs $10.00

PSA vs Magnetic Backing — Which to Choose

Feature PSA Backing Magnetic Backing
Disc change speed Peel & stick — slower Instant tool-free — faster
Best for Fixed single-grit setups, extended single-stage use Multi-grit workflows, frequent disc changes
Cost More economical Higher initial cost
Disc compatibility PSA-backed discs only Magnetic-backed discs only
Adhesive residue Some residue on disc change None

Compatible PSA Discs

Related Tools

Frequently Asked Questions

  • Q: What does PSA mean on a backing plate?
    A: PSA stands for Pressure Sensitive Adhesive. PSA backing sets are designed to accept PSA-backed sanding discs and polishing pads — the disc has a self-adhesive layer on the back that bonds directly to the backing surface when pressed firmly. No additional adhesive or tools are needed for mounting.
  • Q: Can I reuse a PSA backing plate after removing a disc?
    A: Yes — carefully peel the used disc from the edge to minimize adhesive residue. Remove any remaining adhesive with isopropyl alcohol and allow the plate to dry completely before mounting a new PSA disc. The backing plate itself is reusable indefinitely.
  • Q: Should I choose PSA or magnetic backing for my flat lap machine?
    A: Choose PSA if you run a single grit for extended periods and want a lower-cost solution — PSA is ideal for fixed single-stage setups. Choose magnetic backing plates if you frequently switch between grits during a polishing sequence — magnetic allows instant disc changes in seconds without adhesive residue, making multi-stage workflows significantly faster.
  • Q: What is the difference between the 5pcs PSA backing set and a single PSA backing plate?
    A: The 5pcs PSA backing set includes 5 individual PSA backing discs — allowing you to pre-mount 5 different grit discs on separate backing plates for quick stage changes without waiting for adhesive to cure or cleaning between stages. This is particularly useful for production polishing workflows where multiple grit stages are used in sequence.