Plasma Cutting & Thermal Cutting Mats

Plasma and thermal cutting sever metal rather than joining it, so molten dross is blown and dropped through and around the cut. Compared with arc welding — where spatter lands close to the work — cutting dross is hotter, heavier and travels further, so it puts a wider area of floor at risk.

Recognised hot-work fire-safety guidance (NFPA 51B in the US) calls for clearing or protecting combustibles within about 35 ft (roughly 10.7 m) of cutting, and UK sites commonly work to a similar ~10 m zone. Some plasma-cutter vendors note sparks and dross can travel further still; the exact figures vary (commonly cited around 30–40 ft) and should be treated as indicative, medium-confidence, and confirmed for your own setup.

The practical point for the floor is coverage: protect well beyond the cut itself, not just directly under the table. Where the surrounding area matters, extend protection with hot works matting and keep combustibles out of the spray zone.

For a cutting station, choose fire-resistant matting rated for molten contact and size it to the table footprint plus the wider zone where dross falls and rolls. Confirm the grade against the product’s datasheet and reaction-to-fire classification rather than a label, and ask the supplier for the certificate for the exact product.

• Match the material to direct molten-dross contact, not just stray sparks.
• Size coverage to the table footprint and the wider dross-travel zone.
• Keep the area swept — pooled dross and offcuts are a fire and trip risk.
• Request the product’s fire classification and datasheet before specifying.

No matting is truly fireproof. Plasma cutting mats are fire-resistant, flame-retardant or self-extinguishing for their intended use — they resist ignition and molten contact within a rated range, but cutting produces intense, concentrated heat and any material has limits. Use the mat within its stated limits, keep extinguishing means to hand, and follow your hot work permit and fire watch.