What tool is used to cut Extruded Foam (Armaflex)?

• A. Tin Snips
• B. Ceramic Knife
• C. Hacksaw
• D. Chisel

Answer: (B)

When cutting extruded foam like Armaflex, you want a blade that gives a clean edge without tearing the soft material. A ceramic knife fits that need nicely because its edge stays exceptionally sharp and cuts smoothly through foam, producing precise, clean edges with minimal fraying. Metal blades—like those on tin snips or hacksaws—tend to crush, gouge, or tear the foam and don’t give as neat a joint. A chisel would similarly leave rough, ragged edges. So the ceramic knife is the best choice for smooth, accurate cuts in extruded foam insulation.