Aluminium Lapping Film Discs

Aluminium Oxide Lapping Film Discs – Precision AlOx Abrasive Discs for Glass, Optics & Gemstone Polishing

Professional aluminium oxide (AlOx) precision lapping film discs for fine lapping and polishing of glass, optical components, gemstones, semiconductor dies, and fiber optics. Alumina abrasive (gamma phase Mohs 8, alpha phase Mohs 9 / 2000 HV) resin-bonded on rigid 3-mil polyester film — consistent abrasive distribution, stable cutting action, and predictable material removal rates. Available in 6" and 8" diameters with PSA or plain backing, in 11 micron grades from 0.3μm to 60μm. Sold in 10-pack sets.

🔥 Shop Aluminium Oxide Lapping Film Discs – From $18.00

Available Sizes & Pricing

Diameter Micron Range Backing Pack Price
6" 0.3, 0.5, 1, 2, 3, 5, 9, 15, 30, 40μm PSA Sticker 10 pcs $20.00
6" 0.3, 0.5, 1, 2, 3, 5, 9, 15, 30, 40μm Plain (no backing) 10 pcs $18.00
8" 0.3, 0.5, 1, 2, 3, 5, 9, 15, 30, 45, 60μm PSA Sticker 10 pcs $30.00
8" 0.3, 0.5, 1, 2, 3, 5, 9, 15, 30, 45, 60μm Plain (no backing) 10 pcs $30.00

Micron Grade Guide

Micron Approx. Grit Stage Application
30–60μm ~220–400 Coarse lapping Rapid stock removal, surface flattening, scratch elimination
9–15μm ~800–1200 Medium lapping Intermediate scratch removal, surface refinement after coarse stage
3–5μm ~2000–3000 Fine lapping Pre-polish preparation, fine scratch removal
1–2μm ~5000–8000 Fine polish High-gloss surface finishing on glass and softer gems
0.5μm ~14,000 Ultra-fine polish Near-mirror surface quality on optical components
0.3μm ~30,000+ Mirror polish Final optical-quality mirror finish on glass, fiber optics, semiconductors

Compatible Applications

  • Optical components: lenses, prisms, windows, mirrors
  • Semiconductor dies, ceramic capacitors, hard drive read-write heads
  • Fiber optic connectors and laser components
  • Gemstones (Mohs 5–8): glass, quartz, tourmaline, beryl
  • Ceramic seals and precision engineering components

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Frequently Asked Questions

  • Q: What materials are aluminium oxide lapping film discs best suited for?
    A: AlOx lapping film is ideal for glass, optical components, fiber optics, semiconductor dies, ceramic capacitors, and medium-hard gemstones (Mohs 5–8) such as quartz, tourmaline, and beryl. For very hard gems (Mohs 8+) such as sapphire and topaz, diamond lapping film delivers faster cutting and longer disc life due to diamond's superior hardness (Mohs 10).
  • Q: What is the difference between PSA and plain-backed aluminium oxide lapping film?
    A: PSA-backed discs have a self-adhesive backing for direct, secure mounting on flat lap platens or backing plates — ideal for machine use. Plain (non-PSA) discs can be mounted with water tension on glass plates or with spray adhesive, offering more flexibility for hand lapping, custom setups, and precision optical work.
  • Q: What micron grade should I use for final polishing of glass?
    A: Use 0.3μm aluminium oxide film for final mirror polishing of glass and softer gem materials. For a complete sequence: start at 15–30μm for scratch removal, progress through 5–9μm and 1–3μm, then finish with 0.3μm AlOx or switch to cerium oxide film for the final polishing stage on optical-quality glass.
  • Q: What is the difference between gamma and alpha alumina abrasive phases?
    A: Gamma alumina (Mohs 8) is softer and produces a finer, more controlled cut — preferred for final polishing stages and delicate optical surfaces. Alpha alumina (Mohs 9, 2000 HV) is harder and more aggressive, delivering faster material removal in coarser lapping stages. Both phases are available across the micron range in these discs.
  • Q: How many lapping sequences can I get from a 10-pack of lapping film discs?
    A: Each disc in the 10-pack can typically complete multiple lapping sessions before the abrasive is exhausted, depending on material hardness and applied pressure. For optical and semiconductor work, discs are often used once per session to ensure consistent surface quality. For lapidary and general glass work, each disc may last 3–5 sessions with proper cleaning and storage.