PMC3 is the strongest of all PMC silver clays. It is excellent to use in designs which endure frequent impact, such as bracelets. Firing temperatures range from 1110ÂºF - 1290ÂºF. The lower firing temperature provides a wider selection of stones and glass available for use in silver pieces. Additionally it allows the use of some sterling and stainless findings. Tip-PMC has a strong adverse reaction to contact with aluminum. Do not use aluminum tools or allow PMC to contact any aluminum objects.