Flexible Diamond Sheets

Flexible Diamond Sheets – Diamond Sandpaper Sheets & Lapping Film Rolls for Hand Sanding and Precision Finishing

Professional flexible diamond abrasive sheets in sandpaper sheet and precision lapping film roll formats. Diamond sandpaper sheets available in multiple sizes (100×55mm to 300×290mm) across 60–1800 grit for hand sanding of glass, stone, ceramic, and gem materials. Diamond lapping film rolls available in 30mm to 101.6mm widths, 5M to 45M lengths, in 0.5–80 micron grades for precision lapping of optics, fiber optics, ceramics, and hard gem surfaces. PSA backing option available for direct mounting on flat lap platens.

🔥 Shop Flexible Diamond Sheets – From $9.00

Available Sizes & Pricing

Format Size Grit / Micron Range Price
Diamond Sandpaper Sheet 80×30mm (strips) 60 – 1500 grit $9.00
Diamond Sandpaper Sheet 100×55mm 60 – 1800 grit $38.00
Diamond Sandpaper Sheet 100×100mm 60 – 1800 grit $38.00
Diamond Sandpaper Sheet 130×55mm 60 – 1800 grit $36.00
Diamond Sandpaper Sheet 280×230mm 60 – 1800 grit $55.00
Diamond Sandpaper Sheet 300×290mm 60 – 1800 grit $120.00
Diamond Sandpaper Sheet 650×290mm 60 – 1800 grit $185.00
Diamond Lapping Film 5-Pack 280×220mm 0.5 – 80 µm from $16.00
Lapping Film Roll 30mm × 10M 0.5 – 80 µm $100.00
Lapping Film Roll 55mm × 20M 0.5 – 80 µm $160.00
Lapping Film Roll 101.6mm × 5M 0.5 – 80 µm $150.00
Lapping Film Roll 101.6mm × 10M 0.5 – 80 µm $200.00
Lapping Film Roll 101.6mm × 45M 0.5 – 80 µm $1,200.00

Abrasive Type Guide

Abrasive Best For Grit / Micron
Diamond Hard gemstones (Mohs 6+), glass, ceramics, fiber optics, optics 60 grit – 0.5 µm
Silicon Carbide Stone, glass, ceramics — aggressive cutting 1 – 60 µm
Aluminum Oxide Glass, ceramics, softer gem materials — fine finishing 0.3 – 40 µm

Compatible Applications

  • Hand sanding of lapidary stone, agate, jasper, quartz, and glass
  • Precision lapping of optical components and fiber optic connectors
  • Ceramic and porcelain surface finishing
  • Flat lap platen surfacing (PSA backing option)
  • Custom-cut lapping fixtures — rolls can be cut to any size
  • Pre-polish and final polish stages on hard gem materials
  • Knife blade and tool edge finishing

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Frequently Asked Questions

  • Q: What is the difference between diamond sandpaper sheets and diamond lapping film?
    A: Diamond sandpaper sheets use a flexible cloth or paper backing with electroplated diamond abrasive — designed for hand sanding of stone, glass, and gem materials at grits from 60 to 1800. Diamond lapping film uses a precision polyester film backing with micron-graded diamond particles (0.5–80 µm) for ultra-precision surface finishing of optics, fiber optics, and hard gem surfaces where exact surface finish control is required. Lapping film produces finer, more consistent surface finishes than sandpaper sheets.
  • Q: What size diamond sheet should I choose for hand sanding lapidary stone?
    A: For hand sanding individual stones, the 100×55mm or 100×100mm sheets ($38) are the most practical — easy to hold and maneuver around curved stone surfaces. For larger flat slabs, the 280×230mm ($55) or 300×290mm ($120) sheets provide more coverage. The 650×290mm and 850×290mm sheets are suited for bench-mounted sanding setups.
  • Q: What micron grade lapping film should I use for gemstone pre-polish and polish?
    A: For gemstone pre-polish, use 9–15 µm diamond lapping film. For fine pre-polish, use 3–5 µm. For final mirror polish on hard gems (Mohs 7+), use 0.5–1 µm diamond lapping film. The PSA backing option allows direct mounting on flat lap platens for machine-assisted lapping.
  • Q: Can diamond lapping film rolls be cut to custom sizes?
    A: Yes — lapping film rolls can be cut to any custom length and width to fit specialized lapping fixtures, custom lap platens, or non-standard machine formats. The PSA backing option allows cut pieces to be mounted directly on flat surfaces without adhesive.
  • Q: What is the PSA backing option on lapping film?
    A: PSA (Pressure Sensitive Adhesive) backing adds a peel-and-stick adhesive layer to the back of the lapping film, allowing direct mounting on flat lap platens, backing plates, or glass surfaces without separate adhesive. The non-PSA option is used in wet lapping fixtures where the film is held by surface tension or mechanical clamping.