3M™ Microfinishing Film Disc 272L, 60 Mic 5MIL, Type UK, 13 in x NH, Die1300B

3M engineers their Microfinishing Film 272L by anchoring aluminum oxide mineral to a polyester film backing with resin. This abrasive is uniquely suited to help with polishing and finishing on many different workpieces: gelcoat, soft and hard rubber, soft and hard composites, fiberglass and metals. 3M chose aluminum oxide mineral for this abrasive, because it is a popular choice among industrial professionals who favor the fast cut rate and long life. Aluminum oxide's hardness, strength and low heat retention help the film withstand wear and tear. Still, aluminum oxide is softer than minerals like silicon carbide or diamond, which prevents the film from severely altering part geometry.

The polyester film backing on 3M™ Microfinishing Film 272L is water resistant, so it can be run wet or dry. Applying a lubricant like water may help with washing away unwanted swarf and debris, which can clog the film and cause the mineral to dull prematurely. On dust-generating substrates, using a lubricant can come in handy. The polyester backing is one of the heaver backings, so it can stand up to edges without yielding or deflecting. The resin bond that fastens aluminum oxide to the backing helps the abrasive stay cool, because it breaks down and dissolves gradually as the belt rotates.

Given that it's available in a versatile range of grades – from 9 to 100 micron – operators can select the right grade for their application. Higher grades, like 100 micron, are good for tougher applications providing coarser finishes, while lower grades, like 9 micron, are good for softer, finer finishes. Grades are color-coded to reduce the risk for error when there are multiple grades in a sequence.

• Durable 5 mil film backing won’t deflect when run, so it can stand up to edges and contours
• Micron graded aluminum oxide mineral cuts sharp but won’t gouge or mar the substrate
• Features a closed coat construction for finish consistency
• Excellent choice for applications requiring fine finishes
• Available in a versatile range of grades, so operators can select the right grade for their application