3M 7000044803 Lapping Film 40.0 Micron Psa 8.5x11 in Sheet

Product Description

The 3M 7000044803 is a pressure-sensitive adhesive (PSA) lapping film sheet engineered for precision surface finishing. It features aluminum oxide mineral bonded to a 3 mil polyester film base using a durable resin system. The abrasive grade is 40.0 micron, placing it in a mid-range finishing position suited for controlled material removal and surface refinement. Each sheet measures 8.5 inches by 11 inches. The PSA backing allows the sheet to mount securely to flat lapping plates or backing fixtures without mechanical clamps, reducing setup time and keeping the film flat during use. Technicians in fiber optic termination, precision grinding, and roll superfinishing shops rely on this product for repeatable, consistent results.

This lapping film is used in applications that require tight surface finish tolerances. Primary applications include fiber optic connector end-face finishing, where controlled scratch patterns and consistent micron-grade abrasion are critical to signal integrity, and roll superfinishing, where final surface geometry must meet strict tolerances. The PSA sheet format is compatible with flat lapping machines, hand lapping fixtures, and foam or rubber backing pads. The 40.0 micron grade is typically used in intermediate finishing stages before progressing to finer grades. The 3M 266X series is available in seven grades ranging from 0.05 micron to 60.0 micron to support multi-step finishing sequences.

Key Features

• 40.0 micron aluminum oxide abrasive for controlled intermediate finishing
• PSA backing mounts to flat plates and backing pads without clamps
• 3 mil polyester film base resists tearing and maintains dimensional stability
• Durable resin bond system holds mineral under sustained lapping pressure
• 8.5 inch x 11 inch sheet size fits standard lapping fixtures and can be cut to size
• Part of the 266X series, available in grades from 0.05 to 60.0 micron for full-sequence finishing

Compatibility

Designed for use in fiber optic finishing and roll superfinishing applications. Compatible with flat lapping plates, foam backing pads, and rubber backing fixtures that accept PSA-backed sheet abrasives.

Installation Notes

Clean the lapping plate or backing surface thoroughly before applying the PSA sheet to ensure full adhesion and prevent the film from shifting during use. Peel and apply the sheet smoothly from one edge to avoid air bubbles, which can cause uneven abrasion. When used in fiber optic finishing, follow the connector manufacturer's recommended lapping sequence and progress through micron grades in order. Dispose of used sheets per facility waste-handling procedures for abrasive materials.

Technical Specifications

• Abrasive Mineral: Aluminum oxide
• Micron Grade: 40.0 micron
• Backing Material: 3 mil polyester film
• Bond System: Resin
• Attachment Type: PSA (pressure-sensitive adhesive)
• Sheet Size: 8.5 inches x 11 inches
• Weight: 0.05 pounds
• Unit of Measure: Each
• Minimum Order Quantity: 200
• UPC: 00051144813360

Standard Information

• Brand: 3M
• Manufacturer Part Number: 7000044803