Choosing the right white aluminium oxide grit is not as simple as ordering the most common size your supplier has in stock.

F24, F36, F60, F80, F120 and F220 are all white aluminium oxide, but they can produce very different cutting rates, surface profiles and finishes.

A coarse grit can remove material quickly, but it may leave a surface that is too aggressive for the next processing step. A finer grit can create a smoother finish, but using it for heavy stock removal may reduce productivity and increase processing time.

For an industrial buyer, the better question is therefore not:

“Which white aluminium oxide grit is best?”

It is:

“Which grit size is right for my material, process and required surface finish?”

In this guide, I will explain how common white aluminium oxide grit sizes are used in sandblasting, grinding wheels, bonded abrasives, coated abrasives, surface preparation, lapping and precision finishing, and what information you should provide to a manufacturer before placing an order.

What Is White Aluminium Oxide Grit?

White aluminium oxide, also called white fused alumina (WFA) or white aluminum oxide, is a synthetic abrasive produced by melting high-purity alumina in an electric arc furnace.

After fusion and cooling, the material is crushed, cleaned and classified into controlled particle-size fractions for different industrial applications. CUMI describes white fused alumina as a high-purity synthetic mineral manufactured from Bayer alumina at temperatures above 2,000°C and subsequently crushed, magnetically cleaned and classified according to end-use requirements.

White aluminium oxide is valued for its combination of:

• High hardness
• High purity
• Sharp cutting edges
• Friability
• Chemical stability
• Relatively low contamination
• Controlled particle sizes

Because the grain fractures during use and exposes new cutting edges, white fused alumina is particularly useful where a clean and relatively cool cutting action is required. It is widely used in bonded abrasives, coated abrasives, surface treatment, blasting, lapping, ceramics and other industrial applications.

Understanding White Aluminium Oxide Grit Sizes

One of the first things buyers should understand is that a lower grit number generally represents a coarser abrasive, while a higher grit number represents a finer abrasive.

For example:

• F24 is relatively coarse.
• F60 is a medium grit.
• F120 is considerably finer.
• F220 is used where finer cutting and finishing are required.

However, the grit number should not be treated as a single particle diameter.

FEPA explains that abrasive particle sizes are controlled through defined grain standards, and that macrogrit size specifications represent particle-size distributions rather than a single particle diameter. FEPA also distinguishes between F-grits for bonded abrasives and P-grits for coated abrasives.

For bonded abrasives and many general industrial applications, the FEPA macrogrit standard covers F4 to F220.

That distinction matters when requesting quotations.

Simply writing:

White aluminium oxide 80 grit

may not always be sufficient.

A better purchase specification might say:

White Fused Alumina F80, FEPA standard, for bonded abrasive production.

White Aluminium Oxide Grit Size Chart

The following table provides a practical starting point for industrial buyers.

These ranges should be treated as selection guidelines rather than fixed rules.

Actual performance will also depend on:

• Blasting pressure
• Nozzle size
• Workpiece material
• Abrasive flow rate
• Grinding wheel bond
• Machine speed
• Contact pressure
• Grain shape
• Recycling cycles
• Required surface roughness

This is why sample testing is important when changing grit sizes or suppliers.

Which White Aluminium Oxide Grit Should I Use for Sandblasting?

Sandblasting is one of the most common applications for white aluminium oxide grit.

White aluminium oxide is particularly useful when buyers want an aggressive mineral abrasive but also want to minimize contamination from the blasting media.

Washington Mills describes its high-purity white aluminum oxide blasting grain as sharp and friable and specifically positions it for applications where surface contamination is unacceptable.

For blasting, I would normally start by dividing applications into three groups.

F24–F46: Aggressive Surface Preparation

Coarser white aluminium oxide grits are usually considered when the priority is:

• Fast scale removal
• Heavy surface cleaning
• Strong surface profiling
• Removing stubborn coatings
• Preparing durable metal surfaces

Typical starting choices include:

F24, F30, F36 and F46.

These grains strike the workpiece with greater individual particle mass and can create a more pronounced surface profile.

The trade-off is that the final surface will usually be rougher.

If your next process requires a fine coating or highly controlled surface finish, going too coarse may create unnecessary rework.

F54–F80: General Industrial Blasting

For many industrial buyers, this is the most useful range to investigate first.

Typical sizes include:

F54, F60 and F80.

They are often selected when the buyer needs a compromise between:

Cleaning speed + surface profile + finish quality

Potential applications include:

• Stainless steel surface preparation
• Aluminum component cleaning
• General metal finishing
• Preparing parts before coating
• Cleaning cast components
• Industrial surface treatment

CUMI notes that fused abrasive grains are used in blasting for surface preparation before processes such as thermal spraying, electroplating and coating, as well as for cleaning castings and industrial components.

If a buyer contacts me without knowing the exact grit but says:

“We need white aluminium oxide for general metal blasting.”

F60 or F80 would normally be useful reference points for sample testing, depending on the required profile.

F90–F120: Fine Blasting and Controlled Finishing

When the priority moves from aggressive cleaning toward a more controlled finish, finer grit becomes more attractive.

Typical choices include:

F90, F100 and F120.

These may be suitable for applications such as:

• Fine surface finishing
• Light cleaning
• Deburring
• Controlled matte finishing
• Smaller precision components
• Applications where an excessively rough surface is undesirable

Washington Mills also lists high-purity white aluminum oxide for sensitive blasting applications, including cleaning and deburring applications where contamination control matters.

What White Aluminium Oxide Grit Is Best for Stainless Steel?

White aluminium oxide is frequently considered for stainless steel because buyers often want to avoid unnecessary contamination during blasting or finishing.

The right grit depends on what you want the stainless steel surface to look like afterward.

For relatively aggressive preparation, buyers may begin testing around:

F36–F60

For more controlled surface finishing:

F60–F100

For finer cosmetic or precision finishing:

F100–F180

However, the required surface roughness or profile should be specified whenever possible.

Instead of telling a supplier:

I need white aluminium oxide for stainless steel.

it is much more useful to say:

Material: 304 stainless steel
Process: pressure blasting
Purpose: surface preparation before coating
Current grit: F80
Required finish: uniform matte surface

That gives the manufacturer enough information to make a meaningful recommendation.

Choosing White Aluminium Oxide Grit for Grinding Wheels

White fused alumina is also an important raw material for bonded abrasives, including grinding wheels, mounted points, honing stones and related tools.

FEPA specifically uses the F designation for bonded abrasive grains, while coated abrasives use P-grit designations.

CUMI notes that white fused alumina is used in vitrified bonded abrasives where cool, fast cutting action is important, while its bonded abrasive products are used for applications including tool grinding, internal grinding, gear grinding, roll grinding and centerless grinding.

A simplified starting point looks like this:

F24–F46

Better suited to:

• Heavy grinding
• Fast stock removal
• Coarser grinding wheels

The emphasis is cutting speed rather than fine finish.

F54–F80

Useful for:

• General-purpose grinding
• Tool grinding
• Surface grinding
• Medium stock removal

This range provides a more balanced relationship between cutting efficiency and finish.

F90–F120

More suitable for:

• Fine grinding
• Sharpening
• Precision tool finishing
• Controlled stock removal

F150–F220

Used where the process requires:

• Fine grinding
• Precise finishing
• Lower material removal
• Improved surface finish

But grit size is only one part of grinding wheel performance.

The wheel manufacturer also needs to consider:

grain type + grit size + bond + hardness grade + structure + operating speed

So purchasing the finest available white aluminium oxide does not automatically produce the best wheel.

White Aluminium Oxide Grit for Coated Abrasives

If you manufacture:

• Sandpaper
• Abrasive cloth
• Abrasive belts
• Flap discs
• Fibre discs

you should pay particular attention to the difference between F grit and P grit.

FEPA states that P-grit sizes are used for coated abrasives, with standards covering ranges such as P12–P220 and finer grades beyond this range.

Therefore:

F80 and P80 should not automatically be treated as identical purchase specifications.

When requesting white aluminium oxide for coated abrasives, specify:

• FEPA P grit
• Backing/application type
• Required grain shape
• Coating method
• Desired cutting behavior

CUMI notes that coated abrasive grain characteristics such as grain shape, size, density and electrostatic behavior can influence adhesion and cutting performance in coated abrasive products.

What Grit Should I Use for Precision Grinding?

For precision grinding, the basic rule is straightforward:

As the required finish becomes finer, the abrasive grit usually needs to become finer as well.

For example:

F80–F120

May be considered for intermediate precision grinding where some material still needs to be removed efficiently.

F150–F220

May be more appropriate when surface finish and dimensional control become increasingly important.

For extremely fine finishing, buyers may need to move beyond conventional macrogrits into white fused alumina microgrits.

CUMI produces white fused alumina microgrits by grinding and classifying selected macrograin feedstock and notes that these products are used in applications including bonded abrasives, coated abrasives, lapping and micro-blasting.

This is an important distinction.

If your process requires extremely fine polishing, simply asking for “F220 grit” may not be sufficient.

You may actually need a micro powder specification.

White Aluminium Oxide for Lapping and Polishing

Lapping is different from ordinary grinding.

Instead of aggressively removing a large amount of material, lapping is often used to control:

• Flatness
• Parallelism
• Thickness
• Surface finish

CUMI describes lapping as a precision machining process using fine abrasive grains and identifies particle-size distribution and friability as important factors in achieving uniform stock removal and surface finishing.

For this reason, buyers doing precision lapping should pay less attention to the simple grit number and more attention to:

• Median particle size
• Oversize control
• Particle-size distribution
• Purity
• Grain shape
• Agglomeration
• Consistency between batches

For highly sensitive polishing operations, an occasional oversized particle can affect the finished surface.

That is why micro powder classification quality becomes increasingly important as the required finish becomes finer.

Coarse vs Fine White Aluminium Oxide Grit

A simple way to understand the difference is:

Coarser Grit

Provides:

• Faster stock removal
• Stronger cutting action
• Deeper surface profile
• Higher productivity in heavy cleaning

But may also create:

• Rougher surfaces
• Deeper scratches
• More aggressive material removal

Finer Grit

Provides:

• Smoother surface finish
• Shallower profile
• Better control
• Better suitability for precision work

But usually means:

• Slower stock removal
• More processing time for heavy cleaning

So there is always a trade-off.

The goal is not to choose the finest grit possible.

The goal is to choose the coarsest grit that can still achieve the required final surface condition efficiently.

A Simple White Aluminium Oxide Grit Selection Guide

If I were helping an industrial buyer make an initial selection, I would start here:

Heavy material removal

Start testing:

F12–F24

Aggressive sandblasting

Start testing:

F24–F46

General sandblasting

Start testing:

F46–F80

General grinding

Start testing:

F46–F80

Fine surface preparation

Start testing:

F80–F120

Precision grinding

Start testing:

F100–F180

Fine finishing

Start testing:

F150–F220

Lapping / very fine finishing

Consider:

Microgrit / micro powder

These ranges are not substitutes for production testing.

If surface roughness is critical, I would always test two or three adjacent grit sizes before committing to a large order.

5 Factors I Would Check Before Choosing a Grit Size

1. What Material Are You Processing?

The workpiece may be:

• Stainless steel
• Carbon steel
• Aluminum
• Titanium
• Ceramic
• Glass
• Tool steel
• Non-ferrous alloy

Different materials respond differently to the same abrasive size.

2. How Much Material Do You Need to Remove?

If you need aggressive stock removal, using F180 instead of F36 will dramatically change productivity.

Likewise, using an unnecessarily coarse grain for fine finishing can damage the surface.

3. What Surface Finish Do You Need?

Whenever possible, define the required:

• Surface profile
• Roughness
• Appearance
• Scratch level

“Smooth” and “rough” are subjective descriptions.

A measurable specification is much more useful.

4. What Equipment Are You Using?

For blasting, tell the supplier whether you use:

• Pressure blasting
• Suction blasting
• Wet blasting
• Automated blasting

For grinding, provide information about the grinding tool and process.

Equipment conditions can change how the same grit performs.

5. Will the Abrasive Be Recycled?

In blasting applications, recyclability can affect total operating cost.

Do not compare abrasives only by the price of one kilogram.

Compare:

Cost per kg ÷ useful working cycles + processing performance

A more expensive abrasive that lasts longer may have a lower real operating cost.

How I Would Specify White Aluminium Oxide Grit to a Manufacturer

A common problem I see in B2B inquiries is that the buyer sends only:

Need white aluminium oxide. Please quote.

That forces the supplier to ask several questions before giving an accurate quotation.

A much better inquiry would look like this:

• Product: White Fused Alumina
  Grit: F60
  Standard: FEPA
  Application: Stainless steel sandblasting
  Quantity: 5 MT
  Packaging: 25 kg bags + pallet
  Destination: Hamburg, Germany
  Required documents: TDS + COA
  Sample: Required before bulk order

With these details, manufacturers can provide a much more useful quotation.

What Should You Check on the COA?

Before purchasing white aluminium oxide grit in bulk, I would review at least:

• Al₂O₃ content
• Na₂O
• Fe₂O₃
• SiO₂
• Magnetic content where relevant
• Particle-size distribution
• Bulk density where required
• Moisture where applicable

The exact requirements depend on your application.

For a standard blasting operation, some parameters may have limited influence.

For precision abrasive tools, advanced ceramics or fine finishing, tighter controls may be necessary.

Why Sample Testing Matters

Two suppliers can both label a product:

White Aluminium Oxide F80

but the products may not perform identically.

Differences can come from:

• Grain shape
• Crushing method
• Classification accuracy
• Oversized particles
• Friability
• Impurity levels
• Bulk density
• Batch consistency

Therefore, for repeat industrial purchasing, I recommend the following process:

Confirm Specification

↓

Request TDS and COA

↓

Receive Sample

↓

Run Production Test

↓

Compare Surface Finish / Cutting Rate

↓

Place Trial Order

↓

Evaluate Batch Consistency

↓

Move to Regular Supply

That is much safer than choosing a supplier entirely on price.

Where Yumo Fits for White Aluminium Oxide Grit Sourcing

For buyers sourcing white aluminium oxide grit from China, Henan Yumo New Materials can supply white fused alumina for abrasive, grinding, blasting, polishing and related industrial applications.

For an inquiry, I would recommend providing Yumo with the required:

• F grit or P grit
• Application
• Annual consumption
• Required chemical specification
• Packaging
• Destination port

If you are unsure whether your process should use F46, F60, F80, F120 or another size, the better approach is to describe the workpiece and required finish first, then compare samples of the most suitable adjacent grit sizes.

For industrial purchasing, getting the right specification is usually more important than simply finding the lowest price per ton.

Final Thoughts

Choosing the right white aluminium oxide grit size is ultimately a balance between cutting speed and surface finish.

If the grit is too coarse, you may remove material quickly but create an unnecessarily rough profile.

If it is too fine, you may achieve a smoother finish but lose productivity.

As a practical starting point:

F24–F46 → heavy grinding and aggressive blasting
F54–F80 → general grinding and surface preparation
F90–F120 → fine blasting and finishing
F150–F220 → precision grinding and fine finishing
Microgrits → lapping, micro-blasting and very fine applications

But I would never place a large order based on this table alone.

The final selection should consider the workpiece material, process, required surface finish, equipment, abrasive standard and production test results.

For industrial buyers, the best white aluminium oxide grit is not necessarily the coarsest, finest or cheapest option.

It is the grit that gives you the required finish at the most efficient overall processing cost.