NATURE-CRYL SUPER HI IMPACT® from GC America exceeds all of the requirements of Type 1 Class 1 denture base material. It is ultra high impact, cadmium-free, and offers up to 20 minutes working time. NATURE-CRYL SUPER HI IMPACT resists breakage, is easily finished and polished, has superior physical properties, and has a convenient two-hour heat cure or overnight cure. NATURE-CRYL SUPER HI IMPACT has superior impact strength that exceeds all other denture-based resins on the market today.