3M Lapping Film Grit Equivalent Table (Micron–Grit Reference)

Time : 2025-07-02

3M Lapping Film Grit Equivalent Table

3M Product SeriesAbrasive TypeGrit GradeMicron Size (μm)Typical ApplicationAlternative Equivalent
261XDiamond0.1 – 60 μm0.1, 0.5, 1, 3, 6, 9, 15, 30, 45, 60Fiber optic polishing, hard materials (ceramics, sapphire)Diamond Lapping Film (Custom OEM)
268XAluminum Oxide (AO)0.3 – 30 μm0.3, 1, 3, 6, 9, 15, 30Metallography, connector polishingAO Lapping Film / Microfinishing Film
466XSilicon Carbide (SiC)5 – 30 μm5, 9, 15, 30Carbide, glass, ceramic lappingSiC Lapping Film
598XSilicon Dioxide (SiO₂)0.02 – 0.1 μm0.02, 0.05, 0.1Final polish for optics, glass, fiber endfacesSiO₂ Final Polishing Film
372L / 373LAO / SiC / Diamond9 – 80 μm9, 15, 30, 45, 60, 80Automotive shafts, rollers, blades, bearings finishingMicrofinishing Film Rolls

Grit to Micron Conversion Reference

Grit GradeApprox. Micron Size (μm)Common Use
80~260 μmHeavy stock removal
60~250 μmCoarse roller polishing
45~150 μmInitial shaping
30~45 μmCoarse lapping, pre-polish
15~20 μmGeometry correction
9~12 μmFiber ferrule pre-polish
6~9 μmPre-final polish
3~6 μmConnector geometry control
1~3 μmIntermediate polishing
0.5~1 μmFinal polish
0.1~0.3 μmSuper-fine finishing for optics/fiber
0.05~0.1 μmMirror finish for glass/ceramic
0.02~0.05 μmUltimate final finish for MT/MPO endfaces

 3M Film Substitution Guidance

If You Use 3M...Switch To... (Compatible Alternative)
3M 261XDiamond Lapping Film (0.1–60μm)
3M 268XAluminum Oxide Lapping Film
3M 466XSilicon Carbide Lapping Film
3M 598XSilicon Dioxide (SiO₂) Polishing Film
3M 372L / 373LMicrofinishing Film Rolls (AO / SiC)

 All equivalents available in PSA or plain back, discs/sheets/rolls, and support custom size, grit, OEM logo printing.

 Available Formats & Options

  • Discs: 6", 8", 9", 12" diameter (with or without center hole)

  • Sheets: A4 / 8.5"x11"

  • Rolls: Width 10–350mm, Length up to 100m

  • Backing: PET (3mil/5mil), PSA (adhesive) or plain

  • Customizable: Grid printing, tab notching, barcode, private label

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