Alumina Ceramic and Silicon Carbide Blades

United Diamond Tools carry a range of diamond blades for cutting Alumina Ceramic, from sheet form ceramic to rubber encased Alumina ceramic. We carry blades to cut the hardest product with the cleanest cuts. Our blades are also suitable for silicon carbide.

Our range of blades are from 7"/180mm to 24"/600mm , so next time your cutting advanced impact resistant alumina ceramic and rubber composite or zirconia toughened alumina ceramic give us a call. We have a range of blades from our standard ceramic sheet blades to our Turbo and super Turbo ceramic blades.








Fast cutting Alumina Ceramic Blade with 10mm high segments and long life.
Excellent performance cutting Alumina Ceramic and with good cutting speed and long life.









Well known, fast cutting blade for alumina ceramic and silicon carbide with 10mm high segments and long life. 2.8mm thick.
Proven history of excellent performance cutting with a good cutting speed and long life. Widely accepted through out the industry.

Ultra Thin Turbo Diamond Blades






These ultra thin blades have immediately proven themselves with Australia's alumina ceramic cutting industry.

They provide the ultimate in clean cuts. With features to stop  blade flexing. And they are amazing value as well.

5" - 22.23/16mm centre
8" - 25.4/16mm centre
10" - 25.4/16mm centre
12"/300mm (2.2mm thick) blade due Nov 2018

"Clean Cut" Diamond Blades

Vacuum Brazed





Clean cut blades are now in stock

These blades feature clean cutting and reinforcement in the hub to stop the blade flexing. The soft bond means these blades can cut hard products without chipping. 2.7mm thick

12"/300mm 50mm cutting depth
14"/350mm 75mm cutting depth
16"/400mm 100mm cutting depth

(Last photo - Super turbo series blade segment next to clean cut blade segment)

  Cutting Alumina Ceramic:

Click below to download your FREE Cutting Alumina Ceramic Ebook made especially for UDT customers:

Download the 'Cutting Alumina Ceramic: The Ultimate Guide' Ebook

Or read our booklet here:

Advanced modern ceramics are known as very difficult-to-machine materials. The main factors are their hardness and brittleness. But at the same time, ceramic components often need to meet high standards for dimensional accuracy and surface quality.

Over the years, we have worked with our customers and our diamond blade suppliers to provide cutting solutions to the evolving wear plate industry. As the percentage of zirconium in alumina ceramic has increased, our diamond blades have changed to respond to our customers' demands.

To achieve maximum diamond blade life and overall performance you will need to account for:

  • Material Hardness
  • Material Density
  • Cutting Depth
  • Material Shape
  • Cutting speed
  • Feed Rate
  • Coolant Used
  • Dressing
  • Equipment Type/Condition
  • Material Holding Method
  • Operator Experience

Any change in the above variables can significantly impact the cutting results. The material being cut can vary in composition or density even when coming from the same supplier. A slight change in the coolant feed rate, its direction, blade speed, and even the way the material is held in place can make a difference.

When first cutting alumina ceramic, try using lower machine speeds and smaller cut depths as this will help keep the piece cool, reduce the potential of chipping, and lead to overall the better results. And always avoid physical shock to your work piece.

Material Hardness:

As the percentage of zirconium in alumina ceramic (ZTA) has increased, our diamond blades have changed as well. If the bond matrix on your diamond blade is too soft for the material being cut, it will result in faster wear and shorter blade life. On the other hand, if the bond matrix is too hard, it will result in much slower cutting speeds as well as require constant dressing to expose the next diamond layer. Plan on a hardness of 900 to 1100 on the Vickers hardness test, but in the future hardness may even reach 1500.

If you are cutting alumina ceramic, it is generally recommended that you use a soft bond, thinner kerf (kerf is the width of the cut) diamond blades.

Material Density:

The ever increasing variety of new generation, ultra hard, composite, engineered materials, often with highly metallic content, changes the way we cut with diamond blades. Each material has different density, hardness and composition, so the diamond blades and cutting processes that have worked on one material may not work on another. Material being cut can vary in composition or density even when coming from same supplier.

Cutting depth:

The thicker the material you are cutting, the greater amount of coolant and water pressure is required, and the longer the cutting time.

Material Shape:

To obtain ideal results, select your diamond blade based on the unique differences and properties of each material, it's shape, size, diameter, hardness, and brittleness. Always cut the material so to minimize the cutting area.

Cutting Speed:

Correct speed is one of the most critical factors in successful diamond tool usage. If the diamond blade rotates too slowly, it drags and creates heat. If it rotates too fast, friction and heat are generated. Heat is the worst enemy for alumina ceramic. Selecting the right RPM can be the most difficult aspect of cutting, as many machines do not have variable speeds. However, changing the blade diameter will adjust the "surface feet per minute" speed.

Alumina Ceramic diamond blades can be used either at low or high speeds, each with their own advantages and disadvantages. At very high speeds, diamonds may break (fracture), whereas at very low speeds, they may fall out. An optimum surface speed (RPM) must be selected to balance out the two disadvantages. Diamond blade life will usually increase at slower cutting speeds but the increase in labour costs and other overhead expenses will usually offset savings of diamond blades and other consumables.

If a diamond blade develops dark "burn" marks, the blade is being used is too fast or the amount of pressure is too great. Reduce cutting speed or adjust pressure accordingly.

Variable speed drives are available from W.A. Rewinds in Osborne Park. See their page here

Feed rate:

Most alumina ceramic is cut on computer/CNC controlled precision cutting equipment, so feed rate can often be controlled to a very accurate and constant speed. Experimentation is often needed to find the optimum speed, but it is always slow!


Most diamond blades in precision diamond sawing operations must be used with coolant. There is a large variety of coolants you can select, ranging from water, to water soluble coolants, to minerals and oils. Coolant selection is determined by your specific application. Make sure your coolant is used at where the material is cut by the blade.

Some diamond tool manufacturers recommend the use of either:

  • water or detergent/water mix
  • soluble oil (emulsions of oil in water). One disadvantage of soluble oils is their white, milky colour can obscure vision of the cutting zone.
  • light weight mineral oil (although the storage, use and disposal of mineral oil can be more hazardous than the above options).

Water (often with detergent added if practicable) is an ideal organic coolant that does not leave the material feeling oily, greasy, or contaminated. Oily tiles can be harder to glue later in the process. The amount of coolant used should increase with the hardness of the material being cut. If you see sparks, there is insufficient coolant reaching the cutting zone or it is ineffective.

Using the most effective coolant can allow higher blade and table speeds, greater depths of cut, increased blade life and a better surface finish.


Because alumina ceramic will crack if it overheats, plenty of coolant is required. The extra coolant has a side effect of allowing the blade to glaze over, keeping the diamonds below the bond surface, and reduce cutting effectiveness. Regular dressing of the blade will keep diamonds thoroughly exposed at all times. Dress a new diamond blade before usage, then frequently redress it while using it, as it will reduce chipping or cracking. Always use a recommended dressing stone, such as an 80 grit stones stocked by United Diamond Tools.


The equipment you will be using, as well as it's physical condition, will dictate the speed (RPM) and coolants you can use along with your diamond blades. The precision, accuracy, and repeatability of your equipment will also determine the tolerances you will be able to obtain. A rigid, true running spindle with good bearings is essential for precision cutting.

Material holding method: 

The material must be held firmly for cutting.  A work table that feed smoothly, without side play, is essential. Sometimes rubber mounting is necessary to remove vibration.

Operator experience:

Cutting speed and surface finish quality are often the most important considerations when cutting. A skilled operator can balance the life of the blades against their cutting rate, while maintaining surface finish quality.

Evaluating Diamond Blade Performance :

The performance of your diamond blade can be evaluated under various criteria. Your requirements dictate which of the criteria is most important.

Cutting Life - It is very difficult to estimate the life of diamond blade. It's life is affected by factors such as the application, bond type, blade manufacturer, and hardness and abrasiveness of the material being cut. Also, the following considerations play a major role in diamond blade life:

  • RPM (speed) and power of your equipment
  • feed rate
  • use of coolant (type, force, and direction)
  • operator experience
  • Condition and age of cutting equipment (age will affect the precision, accuracy, and repeatability of cutting equipment).

Blade performance evaluation:

Surface Finish Quality - The quality of the surface finish is evaluated by the amount of chips generated on the face of the material. A visual inspection is the easiest way of checking surface finish quality. The most common scientific way of measuring surface finish quality is using Ra, or Arithmetic Average Roughness. It basically reflects the average height of component irregularities from a mean line. Ra provides a simple value for basing accept/reject decisions.

Break in time - A diamond blade requires time to break in before it can produce relatively chip free performance. The shorter the period of time under which this occurs, the more productive the blade becomes.

Frequency of Dressing - The less your diamond blade needs dressing, the better off you will be.

Diamond blade cost is usually a minor factor in the total cost of the job. Labour and overhead costs are more important factors. Therefore it is important to select a diamond blade that can provide the most performance and productivity, not the lowest blade cost. The blade should be purchased on the basis of cost per piece cut. United Diamond Tools supply blades that are industry leaders in this area of cutting.

Trouble shooting:

Material overheating Not enough coolant
Excessive Burrs on Material Edges Use a finer grit blade
Reduce speeds - RPM or feed rate
Ensure sufficient coolant reaching cutting zone
Chipping Use finer grit blade
Reduce speeds - RPM or feed Rate
Use appropriate coolant for the material
Material is not securely held in place
Re dress the blade
Check saw condition to make sure it is not out of alignment
 Slow cutting blade Redress blade
Increase speeds - RPM or feed rate
 Slow cutting rates Smeared material on the blade
Redress blade
Increase speeds - RPM or feed rate
Rotate material to minimize cutting area
 Blade not cutting Redress blade
Increase speeds - RPM or feed rate
Incorrect blade
 Short blade life Incorrect blade
Insufficient coolant
 Material/saw vibration Too small flange diameter – needs to be 1/3 blade diameter
Slow down feed rate
Material is not securely held in place

Click below to download your FREE Cutting Alumina Ceramic Ebook made especially for UDT customers:

Download the 'Cutting Alumina Ceramic: The Ultimate Guide' Ebook

We stock diamond flap wheels for shaping alumina ceramic and silicon carbide. See our page -

Our range of diamond cup wheels for shaping alumina ceramic and silicon carbide is here:

Please see our "Contact Us" page (here) for Australia wide delivery information.

Disclaimer: the information on this website is provided in good faith and believed to be reliable and accurate at this time. However, the information is provided on the basis that the reader will be solely responsible for assessing the information and its veracity and usefulness. UDT shall in no way be liable, in negligence or howsoever, for any loss sustained or incurred by anyone relying on the information, even if such information is or turns out to be wrong, incomplete, out-of-date or misleading.