3M 7000000259 Diamond Lapping Film 3.0 Micron Sheet

Product Description

The 3M 7000000259 is a diamond lapping film sheet designed for precision surface finishing on extremely hard materials. Precisely graded diamond abrasive particles are coated onto a dimensionally stable polyester film backing, producing a consistent, repeatable cut and finish with each pass. At 3.0 micron particle size, this sheet is suited for fine lapping and polishing stages where surface geometry and finish quality are critical. The 4.50 inch x 4.50 inch format fits standard lapping fixtures and flat-lap setups. Machinists, toolmakers, optical technicians, and precision-instrument technicians are the primary installers and users of this product.

Diamond lapping film at the 3.0 micron grade is commonly used in final or near-final finishing stages on carbide tooling, ceramic components, optical flats, fiber optic end-faces, and hardened steel parts. It is appropriate for both manual lapping on a flat plate and machine-assisted lapping applications where consistent stock removal and surface uniformity are required. The polyester film backing maintains flatness under load, making it effective for geometry-critical work where substrate flex would compromise results.

Key Features

• 3.0 micron precisely graded diamond particle size for fine, controlled material removal
• Diamond abrasive coated on polyester film for dimensional stability and consistent backing flatness
• 4.50 inch x 4.50 inch sheet size fits standard lapping fixtures
• Delivers repeatable surface finish results on carbide, ceramic, optical, and hardened steel substrates
• Part of a broader grade range spanning 0.10 to 30.0 micron for multi-stage lapping processes

Compatibility

Designed for use as a lapping and polishing sheet on extremely hard materials including carbide, ceramic, and optical substrates where conventional abrasives are insufficient.

Installation Notes

Diamond lapping film is typically used by machinists, toolmakers, and optical technicians on flat-lap machines or manual lapping plates. Ensure the lapping surface is clean and free of contamination before placing the film to prevent uneven wear or substrate damage. Use appropriate lubricants or dry conditions as specified by the application and material being finished. Dispose of spent sheets when particle breakdown results in inconsistent finish quality.