Kato polyclay is a brand of oven-hardening polymer clay. The concept of Kato Polyclay was created by the collaboration of Donna Kato, a polymer clay artist, and Van Aken International, a manufacturer of modeling compounds. The material is intended for decorative use such as jewelry, dolls, boxes or vases. Unlike other brands that are generally baked at 275°F (135°C), Kato polyclay can be cured up to 300°F (150°C) for 30 minutes per 1/4" (5 mm) of thickness. It is available in 18 colors including neon, metallics and translucent.