In dentistry, autoclaves provide sterilization of dental instruments. HIER can be performed with microwave ovens, pressure cookers, vegetable steamers, autoclaves, or water baths. Autoclaves use steam heated to under pressure. The sterilization of waste products is yet another application of steam autoclaves. Some computer-controlled autoclaves use an F (F-nought) value to control the sterilization cycle. The resistance to high temperature makes PTFE filter paper suitable for use in autoclaves. Industrial autoclaves are used in industrial applications, especially in the manufacturing of composites. Waste autoclaves process waste either in batches or in continuous-flow processes. Properly designed autoclaves incorporate several additional interlocks for added assurance. Both mineral wool and fibreglass are used in autoclaves. Some autoclaves have built in shredders. This was done by increasing the heat recovery and using large autoclaves and precipitation tanks. This procedure consists of distilling the wood in large autoclaves. Synthetic quartz crystals used in the electronics industry are grown in autoclaves. Other types of autoclaves are used to grow crystals under high temperatures and pressures.