Asphalt diamond blade developed for professional contractors cutting asphalt, green concrete, render, cement screed and lignacite blocks on UK roadworks and infrastructure projects.
• Optimised for fast cutting in asphalt and high-wear abrasive materials
• Undercut protected segment design to manage steel core erosion
• 8mm or 10mm segment height depending on blade size
• Available in 300x20, 350x20, 350x25, 400x25 & 450x25mm sizes
• EN13236 compliant
Asphalt Diamond Blade – Professional – 8mm/10mm Segment – Undercut Protected – OTEC D20
Asphalt diamond blade developed for professional contractors cutting asphalt, green concrete, render, cement screed and lignacite blocks on UK roadworks and infrastructure projects.
• Optimised for fast cutting in asphalt and high-wear abrasive materials
• Undercut protected segment design to manage steel core erosion
• 8mm or 10mm segment height depending on blade size
• Available in 300x20, 350x20, 350x25, 400x25 & 450x25mm sizes
• EN13236 compliant
Asphalt Diamond Blade – Professional – 8mm/10mm Segment – Undercut Protected – OTEC D20 is developed for professional contractors working on UK roadworks, utilities and infrastructure projects where asphalt and abrasive materials are the primary cutting challenge.
It is intended for cutting asphalt, green concrete, cement screed, render, lignacite blocks and abrasive concrete products. The undercut protected segment design helps prevent premature steel core erosion caused by abrasive surfaces, supporting improved blade stability and service life.
The D20 is not suitable for metal, reinforced concrete or very hard materials such as granite and engineering bricks. It should be specified specifically for asphalt-led and high-abrasion applications.
As a high-performance alternative to the OTEC D20 300x20mm, the OTEC D20P 300x20mm Professional Plus is also available, offering enhanced cutting speeds and extended service life for intensive site use.
Browse our OTEC diamond blades range for your specific needs.
✓ Designed specifically for asphalt and extremely abrasive surfaces
✓ Hard bond configuration helps resist rapid segment wear
✓ Suitable for green concrete, cement screed and render
✓ Helps reduce premature steel centre wear in abrasive conditions
✓ Supports consistent cutting performance on roadworks and utilities projects
✓ Suitable for continuous professional site use
✓ Developed for stable cutting behaviour under daily contractor use
Specifications Table – OTEC D20
| Specification | Details |
|---|---|
| Product Name | Asphalt Diamond Blade – Professional – 8mm/10mm Segment – Undercut Protected – OTEC D20 |
| Product Code | D20 |
| Segment Height | 8mm or 10mm (size dependent) |
| Segment Type | Undercut protected |
| Primary Application | Asphalt |
| Secondary Application | Abrasive materials and green concrete |
| Not Suitable For | Metal, reinforced concrete, very hard materials |
| Safety Standard | EN13236 |
| Use Environment | UK roadworks and infrastructure sites |
| Use Environment | UK construction and infrastructure sites |
| Longevity / Wear Notes | Designed to manage core wear in abrasive cutting conditions |
Variations Table – OTEC D20
| Diameter | Bore | Segment Height | Max RPM | Variation Code |
|---|---|---|---|---|
| 300mm | 20mm | 10mm | 6400 rpm | D20-300/20 |
| 350mm | 20mm | 10mm | — | D20-350/20 |
| 350mm | 25mm | 10mm | 5400 rpm | D20-350/25 |
| 400mm | 25mm | 8mm | — | D20-400/25 |
| 450mm | 25mm | 8mm | 3400 rpm | D20-450/25 |
! Max RPM must always be verified against machine rating before use.
Recommended Saw Type by Blade Size – OTEC D20
| Blade Size | Bore | Recommended Saw Type | Typical Use |
|---|---|---|---|
| 300mm | 20mm | Petrol cut-off saw | Asphalt repairs |
| 350mm | 20mm | Petrol cut-off saw | Deeper asphalt cuts |
| 350mm | 25mm | Floor saw | Continuous roadworks |
| 400mm | 25mm | Floor saw | Heavy-duty asphalt cutting |
| 450mm | 25mm | Floor saw | Major highways works |
The Asphalt Diamond Blade – Professional – 8mm/10mm Segment – Undercut Protected – OTEC D20 is suitable for:
-
Asphalt road and pavement cutting
-
Utility trenching and reinstatement
-
Green concrete removal
-
Cement screed and render cutting
-
Abrasive concrete blocks and paving
Material Suitability Table – OTEC D20
| 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 type and specification are suitable for the material being cut. Inspect the blade 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 guards are correctly fitted.
During use:
Do not apply excessive force when cutting. 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 being cut is firmly secured and frequently inspect the blade for damage.
Wet cutting:
If wet cutting is used, ensure a continuous and adequate water supply to both sides of the blade.
Is the D20 suitable for asphalt cutting?
Yes. It is developed specifically for asphalt and highly abrasive materials.
Can this blade be used on green concrete?
Yes. Green or newly laid concrete falls within its intended abrasive application range.
Is the D20 suitable for reinforced concrete?
No. It is not intended for reinforced or very hard concrete applications.
What does undercut protection provide?
Undercut protection helps prevent premature steel core erosion when cutting abrasive materials.
Which saw types are compatible?
Depending on diameter, the blade is suitable for petrol cut-off saws and floor saws within rated RPM limits.
Does this blade comply with UK safety standards?
Yes. It conforms to EN13236.
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