Dry-heat sterilizers employ high temperatures to destroy microorganisms. These sterilizers are considered effective and safe for metal instruments because the process does not cause rust or corrosion.Dry heat is a far less efficient sterilization process than moist heat, but is nevertheless a useful procedure for sterilizing certain products such as powders and oils.Dry-heat sterilization is mainly used for fats, oils, powders and metal instruments highly likely to rust.