3M™ Microfinishing Film Belt 372L

3M M/F Film Belt, 372L, AO 5 mil, 40 micron, 2 in x 132 in

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

Overall Width (Imperial)

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Overall Length (Imperial)

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Micron Grade

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7 Products Available

Available options:

Overall Width (Imperial), Overall Length (Imperial) and Micron Grade

Specifications

Attribute Name	Value
Abrasive Material	Aluminum Oxide
Alternative Sale Availability	6. This item is for industrial use only and there are no VOC restrictions.
Application	Finishing, Polishing
Backing Material	Polyester Film
Backing Thickness (Imperial)	5 mil
Brand	3M™
Coat Type	Closed Coat
Color Family	Black, Blue, Green, 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
Micron Grade	15 μm, 30 μm, 60 μm, 9 μm
Overall Length (Imperial)	36 in, 54 in, 72 in
Overall Length (Metric)	1371.6 mm, 1828.8 mm, 914.4 mm
Overall Width (Imperial)	2 in, 4 in
Overall Width (Metric)	101.6 mm, 50.8 mm
Product Color	Black, Green, Light Blue, Orange
Product Form	Belt
Substrate	Composites, Glass, Paint, Plastics

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.

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.

Resources

Flyers

3M™ Microfinishing Film Product Portfolio Flyer PDF (PDF, 347.7KB)

Safety Inserts

3M™ Coated Abrasive Belts and Scotch-Brite™ Surface Conditioning Belts (PDF, 483.6KB)

Customer Reviews

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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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.