Outdoor porcelain paving slabs — typically 20 mm thick — are extremely hard, dense, and
non-porous. These qualities make them long-lasting but difficult to cut. Achieving clean, chip-free edges requires the correct combination of machine power, blade specification, and cutting technique.
Blade Selection
Clean cuts depend entirely on blade quality and design. Leading European manufacturers
recommend using continuous-rim diamond blades engineered for porcelain. Unlike segmented blades, which can cause edge chipping, continuous rims deliver smooth, vibration-free cuts.
Because porcelain is extremely hard, the blade’s metal bond matrix should be softer than that used for concrete or granite blades — allowing fresh diamonds to be exposed as the blade wears. For 20 mm slabs, choose a stiff-core blade with a slightly wider kerf (cut width) to prevent deflection. These are typically available in sizes from 125 mm to 300 mm (5–12 inches) and are designed for both table saws and hand-held machines. Wet cutting is strongly recommended: water cools the blade, clears debris, reduces dust, and greatly extends blade life.
Machines and Methods
For straight cuts, a wet bench or bridge saw with a motor of at least 1.1–1.5 kW (1.5 HP) and a porcelain-rated continuous-rim diamond blade provides the best accuracy. The tile must be firmly supported, and the cut made slowly and evenly. Scoring the surface lightly (2–3 mm deep) before cutting through completely can relieve tension and help prevent edge breakout.
For L-shaped, notched, or curved cuts, a hand-held angle grinder (disc cutter) with a porcelain-rated continuous-rim diamond blade should be used. These cuts should be performed wet where possible or with effective dust suppression. Large decorative cuts — such as openings for inspection chambers or columns — can also be made with plunge saws or water-jet systems for precision.
Safety and Personal Protection
Cutting porcelain generates fine silica dust and sharp fragments. Always wear eye protection, a respirator (FFP3/P3), ear defenders, cut-resistant gloves, and protective footwear. Steel toe-capped safety boots (EN ISO 20345) are essential when using hand-held saws or handling large slabs. Long sleeves and trousers protect against flying fragments. Ensure electrical tools are RCD-protected and that all blades conform to EN 13236 (super-abrasive product safety standard).
Summary
To cut 20 mm outdoor porcelain tiles cleanly and safely: - Use a wet bench saw with a
continuous-rim porcelain diamond blade.
- Choose a soft-bond, stiff-core blade (125–300 mm diameter) suitable for dense materials. - Maintain a steady feed rate and avoid forcing the cut.
- For L-shapes or curves, use an angle grinder with a porcelain-rated blade.
- Finish visible edges with diamond polishing pads.
- Always wear appropriate PPE and use RCD-protected tools.
Following these practices, consistent with leading Italian porcelain manufacturers, ensures clean, accurate, and safe results when working with 20 mm outdoor porcelain paving.
