PRECISION POLISHING FILM

For a Consistent and High Quality Finish

Mirror and Lapping Films
with Diamond for
Ultra-Fine Finishes

What is Mirror Film and Lapping Film?

Mirror Film is made by uniformly coating fine-graded abrasive grains onto polyester film using an electrostatic method. This results in superior sanding capability and long-lasting durability. Lapping Film uses micron-graded abrasive grains evenly distributed in a resin adhesive and coated on polyester film to deliver consistent, accurate, and high-quality finishes. Diamond Lapping Film, a film-backed superabrasive, is ideal for precision finishing of ultra-hard, brittle, or advanced materials such as ceramics, ferrites, and next-generation composites.

Backing Material

Polyester film’s uniform thickness, smooth surface, and strength provides strong resistance to pulling and tearing forces, with less elasticity. Various thicknesses are available, starting at a minimum of 25 microns.

Abrasive Minerals and Grit

A variety of abrasive mineral types are available, including Aluminum Oxide, Silicon Carbide and Diamond. We also offer a wide variety of grits from 100 to 0.1 microns in diameter.

  • Roll Applications
    Roll and shaft materials, flat displays, micro motor commutator shafts, and magnetic heads and disks.

  • Disc Applications
    Plastic lenses, optical devices and fibers, magnetic heads and disks, and painted surfaces.

  • Sheet Applications
    Printed circuit boards and optical devices and fibers.

  • Mirror Film Belt Applications
    Flat displays, printed circuit boards,
    and painted surfaces.

  • IMPROVING SURFACE FLATNESs

    Lapping film is very flexible, with a fine grit surface that prevents dust and maintains a clean working environment. It can be used both in dry and wet conditions, and the type of film selected will provide the precision you require.

  • Surface roughness Before and After

    This comparison of surface roughness before and after finishing demonstrates the precision and effectiveness of CDT’s polishing films at achieving smoother surfaces, tighter tolerances, and improved finish quality in demanding applications.

  • INSIDE AND OUTSIDE DIAMETERS OF the SHAFT

    Fresh abrasive is continuously fed at a constant speed, resulting in a uniform finish. The super-finisher has two finishing modes, one with oscillation, and one without it, providing a straight line finish or cross-hatched finish.

  • Close up of the Mirror Film Surface

    This surface roughness graph and enlarged view of Mirror Film show the uniform distribution of fine-graded abrasive grains achieved through electrostatic coating—delivering superior sanding performance and long-lasting durability.

  • Close up of the Lapping Film Surface

    The surface roughness graph and enlarged view highlight how micron-graded abrasive grains are uniformly dispersed in resin and coated on polyester film, which enables Lapping Film to deliver consistent, accurate, and high-quality finishes.

Frequently Asked Questions

  • Mirror Film has a slightly higher surface roughness and is suited for applications requiring strong sanding action with good durability. Lapping Film offers a smoother finish, ideal for precision applications across a range of materials. Diamond Lapping Film provides the finest finish of all—engineered for ultra-hard or delicate materials where extreme precision and surface quality are critical.

  • No. While we manufacture many superabrasive grinding solutions in-house, we also supply select high-performance products from trusted partners. CDT provides local sales guidance, stocking, and delivery for all precision polishing film offerings.

  • CDT acts as your single-source partner, offering personalized product guidance, domestic delivery, and competitive pricing that is backed by fulfillment and support from the original product manufacturer.

  • Absolutely. Our sales and engineering teams work closely with customers to recommend film types and grit sizes based on your material, finish requirements, and production environment.

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Get a custom quote on CDT polishing films tailored to your application. For more information, view the brochure.