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3M™ Microfinishing Film Belt 372L

Products
  • Micron-graded aluminum oxide abrasive cuts fast and provides a consistent, fine finish
  • Durable polyester film backing provides flexibility for consistent finishing
  • Resin bonding resists deterioration from heat, extending the life of the abrasive belt
  • Closed-coat construction provides good grain density and helps deliver a finer finish
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Width
Length
Micron Grade
Products Available
Available options:
 Width, Length and Micron Grade
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Specifications
Attribute Name
Value
Application
Finishing, Polishing
Backing Material
Polyester Film
Backing Weight
5MIL
Brand
3M™
Color
Black, Blue, Green, Orange, Black, Green, Light Blue, Orange
Equipment - Machines
Centerless Grinders, Cylindrical Grinders, Manual Backstand, Microfinishing Machines, Superfinishing Machines, Wide Belt Sanders
For Use On
Composites, Glass, Paint, Plastics
Industries
Aerospace, AOEM, Composite, General Industrial, Primary Metal, Transportation & Heavy Equipment
Length
36 in, 54 in, 72 in
Length (Metric)
1371.6 mm, 1828.8 mm, 914.4 mm
Micron Grade
15 μm, 30 μm, 60 μm, 9 μm
Mineral Type
Aluminum Oxide
Product Form
Belt
Substrate
Composites, Glass, Paint, Plastics
Width
2 in, 4 in
Width (Metric)
101.6 mm, 50.8 mm
Product Details
  • Micron-graded aluminum oxide abrasive cuts fast and provides a consistent, fine finish
  • Durable polyester film backing provides flexibility for consistent finishing
  • Resin bonding resists deterioration from heat, extending the life of the abrasive belt
  • Closed-coat construction provides good grain density and helps deliver a finer finish

Our 3M™ Microfinishing Film Belt 372L is designed to help you get the finest finish possible, and is available in a wide variety of forms. It features micron-graded aluminum oxide abrasive bonded to a durable polyester film backing to produce a fast cut-rate and uniform finish on composites, plastic, fiberglass and metal.

3M™ Microfinishing Film Belt 372L
The 5-mil polyester film backing offers stretch resistance, high unit pressure on the material, compatibility with most coolants and suitability for a wide variety of wet and dry applications.
Flexible Design
3M™ Microfinishing Film Belt 372L is manufactured with a closed coat abrasive surface to increase efficiency and produce a finer finish. To complement the effective abrasive action, the polyester film backing flexes to help achieve a consistent finish over contours and offers greater tear-resistance than comparable paper products, making it ideal for high-production environments. This film comes in a range of micron grades for complete multi-step sanding and finishing.

Aluminum Oxide Abrasive
The 3M™ Microfinishing Film Belt 372L features precision, micron-graded aluminum oxide, which is a popular choice among industrial professionals because of its fast cut-rate and fine finish. This mineral makes a tough, durable abrasive that self-fractures to expose fresh cutting edges. Due to its fast cut-rate, hardness, and strength, it is widely used for sanding and finishing applications.

Heat Resistant with Closed Construction
The 372L belt uses a resin bonding which is specially designed to resist thermal and chemical deterioration, which can occur during sanding. This bond is very tough and excellent for precision work on hard and soft surfaces. This also allows for faster sanding and a higher cut rate. The closed-coat construction of the belt means mineral grains cover 100% of the backing, so the abrasive scratches all of the surface that it comes in contact with. It's commonly used on surfaces where loading is less of a problem, making it a good match for hard metals.

Customer Reviews
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Large Volume Order

If you are considering a large purchase of this or other 3M Abrasive products our inside sales team is ready to help by providing additional information and options that our industrial customers typically seek when making abrasive procurement decisions. Our technical expertise, customer support, and global capabilities put us in a unique position to address your biggest challenges, and we’ll do our best to prove that we should be your abrasive supplier of choice.


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