Asphalt diamond blade developed for professional contractors carrying out asphalt and highly abrasive material cutting on UK highways and construction sites.
• Undercut protected segment design
• Optimised for fast cutting in asphalt and extremely abrasive products
• 10mm segment height
• Available in 300x20mm, 350x25mm and 450x25mm sizes
• EN13236 compliant
Asphalt Diamond Blade – Super Premium – 10mm Segment – Undercut Protected – OTEC D20B
Asphalt diamond blade developed for professional contractors carrying out asphalt and highly abrasive material cutting on UK highways and construction sites.
• Undercut protected segment design
• Optimised for fast cutting in asphalt and extremely abrasive products
• 10mm segment height
• Available in 300x20mm, 350x25mm and 450x25mm sizes
• EN13236 compliant
Asphalt Diamond Blade – Super Premium – 10mm Segment – Undercut Protected – OTEC D20B is developed for professional use on UK highways, roadworks, and infrastructure projects where asphalt and highly abrasive materials are the primary cutting challenge.
It is intended for contractors and site operatives cutting asphalt, green concrete, screed, render, lignacite blocks, and abrasive concrete products. The wedge undercut protection helps reduce steel core erosion when cutting abrasive surfaces, supporting stable cutting behaviour and improved usable blade life under demanding site conditions.
The D20B is not suitable for metal, very hard materials, general purpose masonry, or reinforced concrete. It should be specified specifically for asphalt-led and highly abrasive applications.
Things to consider: Always use personal protective equipment to ensure safety for you and others.
CMT Group offers a comprehensive range of PPE products to suit your needs. Browse our range to make the right purchase.
✓ Wedge undercut protection helps reduce steel core erosion in highly abrasive cutting
✓ Designed to maintain cutting stability on asphalt and abrasive road surfaces
✓ Supports extended blade life where abrasive wear is the primary challenge
✓ Suitable for continuous site use on roadworks and highways projects
✓ Performs reliably on newly laid or green concrete where surface abrasion is high
✓ Helps reduce downtime caused by premature blade wear
✓ Maintains predictable cutting behaviour under regular professional use
✓ Developed for demanding UK construction and infrastructure environments
Specifications Table – OTEC D20B
| Specification | Details |
|---|---|
| Product Name | Asphalt Diamond Blade – Super Premium – 10mm Segment – Undercut Protected – OTEC D20B |
| Product Code | D20B |
| Segment Height | 10mm |
| Segment Type | Undercut protected |
| Primary Application | Asphalt |
| Secondary Application | Abrasive materials and green concrete |
| Suitable Materials | Asphalt, green concrete, screed, render, lignacite blocks |
| Not Suitable For | Metal, reinforced concrete, very hard materials, general masonry |
| Safety Standard | EN13236 |
| Use Environment | UK highways, roadworks, infrastructure sites |
| Longevity / Wear Notes | Designed to manage core wear in highly abrasive cutting conditions |
Variations Table – OTEC D20B
| Diameter | Bore | Max RPM | Variation Code |
|---|---|---|---|
| 300mm | 20mm | 6400 rpm | D20B-300/20 |
| 350mm | 25mm | 5400 rpm | D20B-350/25 |
| 450mm | 25mm | 3400 rpm | D20B-450/25 |
Recommended Saw Type by Blade Size – OTEC D20B
| Blade Size | Bore | Recommended Saw Type | Typical Site Use |
|---|---|---|---|
| 300mm | 20mm | Petrol cut-off saw / bench saw | Asphalt repairs, pavements, small roadworks |
| 350mm | 25mm | Petrol cut-off saw | Deeper asphalt cuts, continuous site work |
| 450mm | 25mm | Floor saw | Highways, long straight cuts, heavy-duty roadworks |
The Asphalt Diamond Blade – Super Premium – OTEC D20B is suitable for:
-
Asphalt road and pavement cutting
-
Highways maintenance and repair work
-
Green concrete and early-age concrete
-
Cement screed and render removal
-
Lignacite blocks and abrasive concrete products
Material Suitability Table – OTEC D20B
| Material Category | Typical Materials Included | Suitability |
|---|---|---|
| Metal | Exposed steel, RSJs, sheet metal, ductile iron pipe, rebar, fibreglass, plastic pipe | ❌ |
| Very Hard | Granite, engineering bricks, hard clay products, hard natural stone, very hard concrete | ❌ |
| Concrete | Limestone and flint aggregate, reinforced concrete, hard unabrasive concrete products | ❌ |
| General Purpose | Kerbs and slabs, medium hard bricks, yorkstone, concrete paviors | ❌ |
| Abrasive | Concrete roof tiles, sandstone, abrasive concrete paviors | ✔ |
| Asphalt | Asphalt, green concrete, render, cement screed, lignacite blocks | ✔✔✔ |
Before use
Ensure the blade specification is suitable for the material being cut. Inspect for cracking, segment detachment, undercutting of the steel core, uneven wear, or other defects. Confirm correct rotation direction and bore compatibility with the machine spindle. Wear appropriate PPE and ensure machine guards are fitted correctly.
During use
Do not apply excessive force. Allow the blade to cut at its designed speed and take regular cooling breaks. If overheating occurs, reassess material suitability. A blunt blade may be refreshed by cutting a soft abrasive material such as brick or block. Ensure the material is securely positioned and regularly inspect the blade for signs of damage.
Wet cutting
If wet cutting is used, ensure a continuous and adequate water supply is applied to both sides of the blade.
Is the D20B suitable for asphalt cutting?
Yes. The D20B is specifically developed for asphalt and highly abrasive materials commonly encountered on UK highways and roadworks.
Can this blade be used on green or newly laid concrete?
Yes. Green concrete and similar abrasive materials fall within the intended application range of the D20B.
Is the D20B suitable for reinforced concrete?
No. This blade is not designed for reinforced or hard unabrasive concrete and should not be specified for structural concrete cutting.
Can the D20B be used for metal cutting?
No. The D20B is not suitable for exposed steel, rebar, sheet metal, or other metal products.
What does “undercut protected” mean?
Undercut protection helps reduce erosion of the steel core when cutting highly abrasive materials, supporting more predictable blade life and improved cutting stability.
Is this blade compliant with UK safety standards?
Yes. The D20B is manufactured in accordance with EN13236, the recognised safety standard for diamond blades used on UK construction sites.
Which machines can the D20B be used with?
Depending on blade diameter and bore, the D20B is suitable for petrol cut-off saws and floor saws, provided maximum RPM limits are respected.
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