Buying guide · Diamond blades
How to choose a diamond blade for concrete, stone, tiles and asphalt
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A diamond blade does not cut like a toothed saw blade: its segments grind the material while the bond wears to expose fresh diamonds. The right blade cuts fast and stays sharp; the wrong one glazes, overheats or wears out within a few cuts.
This guide is based on Tyrolit catalogues and shows which line to choose for each material. Galflex is an authorized Tyrolit distributor in Romania.
Key takeaways
- Choose the blade by material: concrete, hard stone, ceramics and abrasive materials each need a different line.
- A segmented rim cuts building materials fast; a continuous rim gives clean cuts in tiles and porcelain.
- On an angle grinder, diamond blades cut dry: several passes, no forcing, regular cooling breaks.
- Concrete and stone dust contains respirable crystalline silica: use water where the product allows it, on-tool extraction and an FFP2 or FFP3 mask.
How a diamond blade works
A diamond blade has a steel core with segments or a rim of diamond grit held in a metal bond; on Tyrolit dry-cutting blades the segments are sintered and laser-welded to the core. As the bond wears, new diamonds are exposed, which Tyrolit calls a self-sharpening system. So the bond must suit the material: on very hard material, a bond that is too hard glazes and stops cutting; on soft, abrasive material, a bond that is too soft wears away fast.
The Tyrolit line code tells you what the blade is for: DC = dry cutting, U = universal building materials, C = concrete, H = hard stone, A = asphalt, AB = abrasive materials, M = marble, T = tiles and ceramics. The label also shows the maximum speed, segment height, pictograms and EN 13236, the safety standard for diamond tools.
Which diamond blade for which material
The table summarises Tyrolit’s recommendations for dry-cutting blades on angle grinders and cut-off saws. The universal DCU blade suits mixed building materials, but Tyrolit does not recommend it for granite, quartzite, asphalt or ceramics: choose the dedicated line there.
| Material | Blade type | Useful detail | Tyrolit line (label colour) |
|---|---|---|---|
| Concrete, screed, plaster | Concrete or universal blade | Slotted segments for cooling | DCC (red), DCU (yellow) |
| Reinforced concrete | Universal or concrete blade | Check the reinforcement level stated | DCU, DCU TGD (yellow), DCC (red) |
| Brick, masonry, aerated concrete | Universal blade | FAST CUT: closed edge for fast, clean cuts | DCU, DCU-FAST CUT (yellow) |
| Granite, quartzite, hard limestone | Hard stone blade | Universal blades are not recommended | DCH, DCH TGD (blue) |
| Tiles, porcelain, fine stoneware | Continuous rim blade | Shape 1A1R, clean edges | DCT, DCP (green) |
| Marble, soft stone | Marble blade | Fine diamonds for precise edges | DCM (green) |
| Asphalt, green concrete, abrasive materials | Blade for abrasive materials | Segments that protect the core from undercutting | DCA+C (grey, cut-off saws); for joints in abrasive materials on a grinder: DCAB (grey) |
Segmented, turbo or continuous rim
The rim design decides cutting speed, edge quality and how well the blade cools.
- Segmented: segments separated by slots; according to Tyrolit, U-shaped slots give the best cooling and debris removal. The standard choice for concrete, masonry and stone, where speed matters more than edge finish.
- Turbo: a continuous rim with a wavy profile. In general, a compromise between the speed of a segmented blade and the cleaner edge of a continuous one.
- Continuous (closed): an uninterrupted diamond rim, shape 1A1R. It gives very clean edges and is the choice for tiles, ceramics and porcelain.
Dry or wet cutting
Tyrolit diamond blades for angle grinders are dry-cutting blades; the maximum working speed (usually 80 m/s) is marked on the blade. The DCU, DCC and DCH lines may also run wet on cut-off saws from 300 mm; check the pictograms. Water cools the blade and binds dust at the source, so use it wherever blade and machine allow; never improvise a water feed on a mains-powered grinder.
In dry cutting, heat is the main enemy. Tyrolit’s troubleshooting guide recommends:
- Cut solid materials in several passes of 2–5 cm depth.
- Release the pressure regularly and let the blade spin freely to cool in the air.
- Do not force the blade: the weight of the machine is enough.
- Blue or black discolouration of the blade means it has overheated.
See also: Angle grinder discs for DIY
Silica dust: the number one rule
Concrete, mortar, brick, many stones and ceramic tiles contain quartz; cutting them produces respirable crystalline silica dust, fine enough to reach deep into the lungs. Directive (EU) 2017/2398 added “work involving exposure to respirable crystalline silica dust generated by a work process” to Annex I of Directive 2004/37/EC on carcinogens or mutagens at work, with a binding limit value of 0.1 mg/m³ (respirable fraction, 8-hour reference period). The risk comes from the material and the work process, whatever the brand of blade.
The right blade shortens the job, but it does not replace protection:
- Wet cutting, where the blade and the machine allow it.
- On-tool extraction: a guard with an extraction port connected to a vacuum suitable for construction dust.
- A suitable respirator (FFP2 or FFP3) chosen through a risk assessment; breathing apparatus in enclosed spaces.
- Clean up by vacuuming or wetting, never by dry sweeping or compressed air.
Minimum protective equipment
Safety glasses, ear protection, gloves and a dust mask, as shown by the Tyrolit pictograms. Never keep your head in line with the rotating blade.
Correct mounting and signs of wear
Unplug the machine or remove the battery, and never fit a cracked or damaged blade. The arrow must match the direction of rotation, the bore must fit the spindle exactly, and the flanges must be clean, flat and equal. Never exceed the marked maximum speed. Clamp the workpiece and support large slabs against pinching; if the blade jams, switch off, hold the machine still until the blade stops, and never pull a spinning blade from the cut.
| Symptom | Likely cause | What to do |
|---|---|---|
| Blade stops cutting, shiny segments | Specification too hard for the material | A few cuts in soft, abrasive material or a sharpening plate |
| Very fast wear | Blade not suited to an abrasive material | A harder specification for that material |
| Blue or black discolouration | Overheating from excessive pressure | Several passes, cooling breaks |
| Core worn under segments, cracks, lost segment | Very abrasive material, blade too hard, jamming | Take the blade out of service immediately |
See also: Abrasive safety
Why EN 13236 and the oSa mark matter
At 80 m/s a detached segment or a cracked core becomes a projectile, and segment attachment, core stability and specification are invisible when you buy. Tyrolit makes its diamond tools to EN 13236 and is a founding member of oSa (Organisation for the Safety of Abrasives); according to the manufacturer, the oSa label guarantees compliance with EN safety standards, regular manufacturing controls and traceability to the manufacturer.
Tyrolit blade marked EN 13236 and oSa, or a blade without standard markings?
Tyrolit recommends not using tools that lack the oSa and EN 13236 symbols. An unbranded blade without standard markings tells you neither its maximum permitted speed nor its specification, and cannot be traced to a manufacturer. A Tyrolit blade chosen for the material delivers consistent performance and predictable wear: fewer blade changes and fewer re-cuts.
See also: Cheap vs premium discs
Frequently asked questions
Which diamond blade should I use for reinforced concrete?
One explicitly recommended for it: in the Tyrolit range, the universal DCU blades (yellow, including TGD) or the DCC concrete blades (red). Do not force the blade when it meets rebar.
Can I cut porcelain tiles with a segmented blade?
You can, but the edge will chip. For tiles, ceramics and porcelain use a continuous rim blade (1A1R), such as Tyrolit DCT or DCP with the green label.
Why has my diamond blade stopped cutting?
Usually the diamonds have glazed because the specification is too hard for the material. Tyrolit recommends a few cuts in soft, abrasive material or a sharpening plate; if it recurs, switch to the dedicated line.
Can a concrete diamond blade cut metal?
Generally not. It passes through rebar in concrete but is not designed to cut steel as such; for rebar, profiles or sheet, use a metal cutting disc. For mixed jobs, Tyrolit offers DC ALL diamond blades for almost all materials.
Find the right diamond blade for the job
Galflex is an authorized Tyrolit distributor in Romania. See the Tyrolit range, or tell us your material and machine and we will recommend a suitable blade.
See the Tyrolit diamond blade range · Contact us for an offer
Sources and documentation
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