Alloy dental material Lukachrom N

for dental restorations

Product information "Lukachrom N" Lukachrom N (NPA) Ni/Cr / 1000gr Composition: Ni 62,0 % Cr 25,0 % Mo 10,6 % Si 1,9 % other Metals < 1 % Technical Details: Type NPA - Non-Precious Alloy Vickers-Hardness 220 HV 10 Tensile Strenght N/mm² 440 MPa Proof Stress 580 MPa Elastic Modules N/mm² 200 GPa Elongation in % 8 % Density 8,2 g/qcm Solidus 1.210° C Liquidus 1.300° C CTE (25-500° C) 13,9 µm/m.k (25-600° C) 14,4 µm/m.k Pinning: If the beam-casting method is not given preference, but instead single crown pinning is implemented, the casting channel (sprue) should have a diameter of 3 – 4 mm. In the beam casting method the following dimensions should be observed in the sprue systems. Sprue from the cone 3 – 4 mm diameter Transverse sprue (beam) 4 – 5 mm diameter Connection to crown 3 – 3.5 mm in diameter and 5 mm in length. Investment: Any phosphate-bonded, graphite-free investment material that is suitable for alloys that melt at high temperatures can be used. If metallic muffle rings are used, an adequate, if necessary a multilayer, muffle lining is required. For the investing process, the investment material’s instructions for use are to be followed. Required Quantity of Metal: The quantity of metal required for casting is calculated according to the following rule of thumb: “Wax weight of the mould multiplied by the alloy density (8.3 g/cm3) + 10g”. Melting procedure: LUKAChrom N can be melted with both the high-frequency procedure and with an open flame. High-frequency procedure: The casting is initiated 3 – 5 seconds after complete melting.