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Rubber Mold Steels NAK55 Physical Properties Coefficient of Thermal Expansion (x 10-6in/in/F°) 68°F to 212°F   6.3 68°F to 392°F   7.0 68°F to 572°F   7.5 Coefficient of Thermal Conductivity (BTU/ft•hr•F°) At 200°F   23.9 At 400°F   24.4 Magnetic Properties Maximum Magnetic Permeability 380 Saturated Magnetism (Gauss) 16,350 Residual Magnetism (Gauss) 8,500 Coercive Force (Oersted) 14.0 NAK 55 mold inserts. Photo courtesy of Tooling Express, Inc. All technical and engineering data and suggested procedures, specifications and applications contained in this publication are for general information only. Daido Steel, International Mold Steel and/or their distributors disclaim any and all express or implied warranties of merchantability, suitability for any particular purpose or use, or freedom from infringement of any patent, trademark or copyright. NAK80® is a registered trademark of International Mold Steel, Inc. and Daido Steel Limited.

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