Ortotypo 4 Extra Hard Dental Stone, 25 kgExtra hard stone specifically developed for all orthodontic models, demonstration and antagonist. Characterized by high hardness, extra fine granulometry, low expansion and fast setting time. Ortotypo4 is often used with acrylic resins (both hot or cold polymerization processes) with unaltered surface and no models breakage risks . It is compatible with all impression material and all products for the isolation of plaster against plaster. Sold in 25