What is silicon dioxide lapping film used for, and why is it only available in 0.2μm?

SiO₂ film is for final sub-micron polishing of optical glass and silicon wafers. It's only in 0.2μm because its chemomechanical action is most effective at this ultra-fine grade.

What is the difference between SiO₂ and cerium oxide for final glass polishing?

Both use chemomechanical action. SiO₂ (0.2μm) delivers the finest finish for semiconductor-grade wafers and precision optics. CeO₂ (0.3μm) suits general glass polishing and lapidary.

What lapping sequence should I use before switching to SiO₂ film?

15-30μm diamond/AlOx → 5-9μm → 1-3μm → 0.5μm AlOx/diamond → 0.2μm SiO₂. Skipping stages leaves scratches SiO₂ cannot remove efficiently.

Can SiO₂ lapping film be used on gemstones?

No — SiO₂ (Mohs 7) is not effective on hard gems (Mohs 7+). Use diamond lapping film for agate, quartz, and sapphire. SiO₂ is designed for optical glass and silicon wafers.

What is the difference between 30mm and 101mm width SiO₂ lapping film rolls?

30mm×10M is for fiber optic connectors and small-format precision lapping. 101mm rolls (5M, 10M, 45M) are for larger optical polishing and production environments.

Kolekcja: Silicon Dioxide Lapping Film

Silicon Dioxide Lapping Film – 0.2μm SiO₂ Film for Optical Glass, Silicon Wafer & Precision Surface Finishing

Professional silicon dioxide (SiO₂) precision lapping film for final sub-micron polishing of optical glass, silicon wafers, fiber optic connectors, and precision optical surfaces. Available exclusively in 0.2μm grade — the finest abrasive grade in our lapping film range — in roll formats from 30mm to 101mm width and 5M to 45M length. PSA sticker and plain backing options. SiO₂ delivers a chemomechanical polishing action that produces optical-quality mirror finishes without introducing new surface defects.

🔥 Shop Silicon Dioxide Lapping Film – From $80.00

Available Sizes & Pricing

Format	Width	Length	Micron	Backing	Price
Roll	30mm	10M	0.2μm	PSA / Plain	$80.00
Roll	101mm	5M	0.2μm	PSA / Plain	$150.00
Roll	101mm	10M	0.2μm	PSA / Plain	$250.00
Roll	101mm	45M	0.2μm	PSA / Plain	$1,200.00

SiO₂ vs Other Lapping Film Abrasives

Abrasive	Hardness	Finest Grade	Polishing Action	Best For
Silicon Dioxide (SiO₂)	Mohs 7	0.2μm	Chemomechanical	Final sub-micron mirror polish on optical glass & silicon wafers
Cerium Oxide (CeO₂)	Mohs 6	0.3μm	Chemomechanical	Final mirror polish on glass, optics & softer gems
Aluminium Oxide (AlOx)	Mohs 8–9	0.3μm	Mechanical	Optical components, semiconductors, medium-hard gems
Diamond	Mohs 10	0.3μm	Mechanical	Hard gems (Mohs 7+), carbide, sapphire, hard ceramics

Compatible Applications

Silicon wafers and MEMS device surfaces
Optical glass: lenses, prisms, windows, mirrors
Fiber optic connectors and laser components
Precision optical surfaces requiring sub-micron finish
Semiconductor and microelectronics final polishing stages

Related Tools

Diamond Lapping Film Discs — Diamond film for pre-polish stages before SiO₂ final polish
Aluminium Oxide Lapping Film Discs — AlOx film for intermediate lapping stages before SiO₂ finish
Cerium Oxide Polishing Pads — CeO₂ alternative for final mirror polish on glass and optics
Silicon Carbide Lapping Film Discs — SiC film for coarse lapping stages before fine film sequence
Master Support Laps — Precision flat support laps for mounting lapping film
Abrasive Polishing Laps — Complete range of lapping film in all abrasive types and formats

Frequently Asked Questions

Q: What is silicon dioxide lapping film used for, and why is it only available in 0.2μm?
A: Silicon dioxide (SiO₂) lapping film is used exclusively for the final sub-micron polishing stage on optical glass, silicon wafers, and precision optical surfaces. It is only available in 0.2μm because its chemomechanical polishing action — where SiO₂ reacts chemically with the glass surface while abrading mechanically — is most effective at this ultra-fine grade. Coarser SiO₂ grades would be less effective than diamond or AlOx film for intermediate lapping stages.
Q: What is the difference between SiO₂ and cerium oxide for final glass polishing?
A: Both SiO₂ and cerium oxide (CeO₂) use chemomechanical polishing action on glass surfaces. SiO₂ at 0.2μm delivers the finest possible surface finish and is preferred for semiconductor-grade silicon wafers and precision optical components where absolute surface quality is critical. Cerium oxide (0.3μm) is more commonly used for general glass polishing, lapidary, and optical lens work where the slightly coarser finish is acceptable.
Q: What lapping sequence should I use before switching to SiO₂ film?
A: Complete a full lapping sequence before using SiO₂ film: start with 15–30μm diamond or AlOx film for coarse lapping, progress through 5–9μm and 1–3μm for intermediate refinement, then 0.5μm AlOx or diamond for near-mirror quality, and finally 0.2μm SiO₂ for the optical-quality mirror finish. Skipping stages will leave residual scratches that SiO₂ film cannot remove efficiently.
Q: Can SiO₂ lapping film be used on gemstones?
A: SiO₂ lapping film (Mohs 7) is only effective on materials at or below its hardness level. It is not suitable for hard gemstones (Mohs 7+) such as agate, quartz, or sapphire — use diamond lapping film for these materials. SiO₂ film is specifically designed for optical glass and silicon wafer applications where its chemomechanical action provides unique advantages over harder abrasives.
Q: What is the difference between 30mm and 101mm width SiO₂ lapping film rolls?
A: The 30mm×10M narrow roll is designed for fiber optic connector polishing and precision small-format lapping applications. The 101mm wide rolls (5M, 10M, 45M) are for larger-format optical polishing, production lapping environments, and custom disc cutting. Choose the 45M roll for high-volume production use where per-meter cost efficiency is important.