Flexi-Plast 40 Micron Self-Adhesive Aluminum Oxide Finishing Sheet – 8.5" x 11"

Smooth, prepare, and refine surfaces with Flexi-Plast aluminum oxide micro-finishing film. This 40 micron self-adhesive abrasive sheet provides a medium finishing grade with more cutting action than the finer 30, 20, and 15 micron Flexi-Plast sheets.

The flexible sheet can follow flat, curved, and contoured surfaces, while the self-adhesive backing allows cut pieces to be mounted to suitable blocks, holders, or custom-shaped supports. The full 216 x 279 mm sheet can be cut into smaller pieces, strips, or shapes to match the workpiece and application.

Features & Benefits

• Aluminum oxide micro-finishing abrasive

• 40 micron abrasive grade

• Approximately equivalent to P360

• Self-adhesive backing

• Flexible construction

• Useful for surface smoothing and preparation

• Suitable for metals and plastics

• Can be cut into smaller pieces and custom shapes

• Works on flat, curved, and contoured surfaces

• Useful in progressive finishing sequences

• Full 216 x 279 mm sheet

Specifications

40 Micron / P360 Grade

The 40 micron grade provides greater cutting action than the finer Flexi-Plast sheets while still allowing controlled surface refinement.

At approximately P360, this grade is useful for smoothing existing surface marks, preparing a surface for subsequent finishing, and establishing a more uniform scratch pattern before moving to finer abrasives.

Aluminum Oxide Abrasive

Flexi-Plast uses aluminum oxide abrasive for controlled surface finishing.

Its combination of abrasive cutting action and flexible construction makes it useful for working a variety of shapes and surfaces, including:

• Metals

• Plastics

• Flat surfaces

• Curved components

• Contoured surfaces

• Edges

• Irregular shapes

• Detailed workpieces

Self-Adhesive Backing

The 268 L series features a self-adhesive backing, allowing pieces of abrasive to be attached to a suitable support or holder.

Mount a piece to a flat block when a level finishing surface is needed, or use an appropriately shaped support for curved and contoured components.

This provides more control over the abrasive surface and allows Flexi-Plast to be adapted to a wide variety of finishing jobs.

Cut to the Size You Need

Each sheet measures 216 x 279 mm, approximately 8.5" x 11".

The full sheet can be cut into:

• Small finishing pieces

• Narrow strips

• Custom shapes

• Larger sections for broad surfaces

This makes one sheet adaptable to both detailed bench work and larger surface-finishing applications.

Progressive Surface Finishing

The 40 micron grade is particularly useful as an earlier step in a progressive Flexi-Plast finishing sequence.

For example:

60 micron – approximately P240
40 micron – approximately P360
30 micron – approximately P500
20 micron – approximately P800
15 micron – approximately P1000
9 micron – approximately P1800

Moving from larger to smaller micron sizes progressively reduces the scratch pattern and refines the surface.

40 Micron vs. 30 Micron

The 40 micron/P360 version is coarser than the 30 micron/P500 version.

Choose 40 micron when more cutting action is needed for initial smoothing or surface preparation.

Choose 30 micron when the surface is ready for a finer refinement step.

When using both, start with 40 micron and follow with 30 micron.

Ideal For

• Surface smoothing

• Surface preparation

• Scratch refinement

• Metal finishing

• Plastic finishing

• Jewelry and metalworking

• Precision repair

• Restoration work

• Flat surfaces

• Curved and contoured components

• Progressive abrasive finishing

• Detailed bench work

Frequently Asked Questions

What abrasive grade is this sheet?
This version is 40 micron, approximately equivalent to P360.

Is 40 micron coarser than 30 micron?
Yes. Larger micron particles provide a coarser abrasive action, so 40 micron is coarser than 30 micron.

When should I use the 40 micron grade?
It is useful for surface smoothing and preparation when more cutting action is needed before progressing to finer Flexi-Plast grades.

What grade would normally follow 40 micron?
For additional refinement, 30 micron/P500 is a logical next step.

Is the sheet self-adhesive?
Yes. The 268 L series has a self-adhesive backing.

What size is the sheet?
It measures 216 x 279 mm, approximately 8.5" x 11".

How thick is the sheet?
The specified thickness is 0.3 mm.

Can it be used on metal?
Yes. Flexi-Plast is suitable for fine finishing of metals.

Can it be used on plastic?
Yes. Flexi-Plast can also be used for finishing suitable plastic surfaces.

Can I cut it into smaller pieces?
Yes. The sheet can be cut into strips, smaller sections, or custom shapes for the workpiece.

Can I mount it to a sanding block or holder?
Yes. The self-adhesive backing allows cut pieces to be attached to suitable blocks, holders, and shaped supports.

Does a lower micron number mean a finer abrasive?
Yes. Lower micron numbers indicate smaller abrasive particles and progressively finer finishing action.