3M™ Microfinishing Film Roll 372L

10  Products
  • Micron-graded aluminum oxide abrasive cuts fast and provides a consistent, fine finish
  • Durable polyester film backing provides flexibility for consistent finishing on contoured surfaces
  • Polyester film backing can be run wet
  • Available in a range of grades to help operators achieve goal tolerances
View all details
For industrial/occupational use only. Not for consumer sale or use.
Overall Width (Imperial)
Micron Grade
10 Products Available
Available options:
 Overall Width (Imperial) and Micron Grade
All Options
Attribute Name
Abrasive Material
Aluminum Oxide
Backing Material
Polyester Film
Backing Thickness (Imperial)
5 mil
Bond Type
Color Family
Black, Blue, Green, Orange, Purple
Core Size (Imperial)
3 in
Core Size (Metric)
76.2 mm
Equipment - Machines
Microfinishing Machines, Superfinishing Machines
Aerospace, AOEM, General Industrial, Marine, Precision Grinding & Finishing, Primary Metal, Transportation & Heavy Equipment
Micron Grade
100 μm, 15 μm, 30 μm, 50 μm, 60 μm, 80 μm, 9 μm
Overall Length (Imperial)
150 ft
Overall Length (Metric)
45.75 m
Overall Width (Imperial)
4 in, 8 in
Overall Width (Metric)
101.6 mm, 203.2 mm
Product Color
Black, Green, Light Blue, Orange, Purple
Product Form
Roll Wind
Size (Imperial)
4 in x 150 ft, 8 in x 150 ft
Size (Metric)
101.6 mm x 45.75 m, 203.2 mm x 45.75 m
All Metal, Hard-filled Rubber, Plastic, Soft Rubber
Product Details
  • Micron-graded aluminum oxide abrasive cuts fast and provides a consistent, fine finish
  • Durable polyester film backing provides flexibility for consistent finishing on contoured surfaces
  • Polyester film backing can be run wet
  • Available in a range of grades to help operators achieve goal tolerances
  • Color-coded by grade for error proofing

Our 3M™ Microfinishing Film Roll 372L features micron-graded premium aluminum oxide bonded to a 5 mil polyester film backing to deliver uniform results and meet stringent surface requirements. A friction grip coating provides slip resistance for microfinishing machines where film slippage is an issue, and close tolerance work on cylindrical surfaces, such as automotive camshafts and crankshafts.

Predictable, Consistent, Repeatable Performance
In order to achieve an extremely consistent scratch for microfinishing, we use micron-graded mineral, measured at a very tight size tolerances for 3M™ Microfinishing Film Roll 372L. The resin bond ensures reliable, consistent performance. With a durable film backing, the abrasive helps achieve tight geometry and finish tolerances.

This microfinishing roll comes in a broad range of micron grades to achieve reproducible surface characteristics and geometric values that adhere to specification. In some applications, numerous grades are run simultaneously to achieve finishes that differ across the surface of a single complex part. To reduce risk of operator error, we designed Type 2 film in a range of colors — reflective of each grade. The color coding is a useful visual cue, as is sorting width by core size and side and end of roll printing and marking.

3M™ Microfinishing Films
Product Mineral Backing Caliper
Backside Grades (Microns)
9 15 20 30 40 45 50 60 74 80 100 125
372L Aluminum
5 Type S      
372L Type 2*
5 Type S          
373L Aluminum
5 Type Q      
373L Type 2*
5 Type Q          
382L Type 2
6 Type S              
362L Aluminum
3 Type S          
272L** Aluminum
5 Type S      
472L Silicon
5 Type S              
675L Diamond 5 Type S                
Diamond 6 Type S                    

*Suggest to specify the 372L or 373L type 2 (colored) film whenever possible to assist with Error-proofing.
**European Lead Product. Plus wide rolls and belts globally.

Film Backing Provides Uniformly Flat Vehicle for Finer Finish
Film backings provide a superior, uniformly flat surface to hold abrasive particles — abrasive grains don't compress or become pressed into the backing. Highly conformable and tear-resistant, the polyester film backing flexes to help achieve a consistent finish over contours and is stronger than comparable paper products, making it ideal for high-production environments.

For Flawless Geometries
Manufacturers of critical automotive components have little room for error in producing parts to specification. Power generation, life, noise, vibration and friction, fuel efficiency and emissions are all tied to the finishes of crankshafts and camshafts that rotate on increasingly thinner films of oil.

Engine component surfaces and geometry can be improved by using microfinishing which removes variations in the surface, minimizes friction and manipulates metal behavior in other ways.

Learn about 3M™ Microfinishing Film Products. (PDF, 373.73 Kb)

Recommended Applications
3M™ Microfinishing Films are used in the production of industrial components such as custom flanges and fittings for the oil and gas industry, as well as superfinishing of automotive parts, like crankshafts, camshafts and transmission parts.

Learn more about Metalworking solutions. (PDF, 12.95 Mb)

A Portfolio of Abrasive Systems Solutions
From specialty abrasives designed for a highly specific purpose to versatile, jack-of-all-trades sheets, you can find an abrasive tool to accomplish your task or perfect your system. At 3M, we draw from a wealth of original technologies and breakthrough inventions to provide a broad portfolio of abrasives that shape, finish and polish with ease and precision.

Customer Reviews
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Large Volume Order

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For industrial/occupational use only. Not for consumer sale or use.

3M industrial and occupational products are intended, labeled, and packaged for sale to trained industrial and occupational customers for workplace use.  Unless specifically stated otherwise on the applicable product packaging or literature, these products are not intended, labeled, or packaged for sale to or use by consumers (e.g., for home, personal, primary or secondary school, recreational/sporting, or other uses not described in the applicable product packaging or literature), and must be selected and used in compliance with applicable health and safety regulations and standards (e.g., U.S. OSHA, ANSI), as well as all product literature, user instructions, warnings, and other limitations, and the user must take any action required under any recall, field action, or other product use notice.  Misuse of 3M industrial and occupational products may result in injury, sickness, death, or property damage.  For help with product selection and use, consult your on-site safety professional, industrial hygienist, or other subject matter expert.