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Rubber Mold Steels PX5 General Design Guidelines: Compressive Strength Uniform hardness (approximately 32 HRc) from surface to core assures that strength and hardness at the mold center are the same as at the surface. Exceptional toughness reduces cracking problems while increasing flexibility in mold design.   Stability PX5 is substantially more stable than common P20-type steels. Since it has a unique heat treating process, it does not have the stresses inherent in typical quenched and tempered steels. PX5 never needs stress relieving, even after heavy machining. It has excellent dimensional stability and consistency during the machining process, and during the heating and cooling cycles of injection or compression molding. 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. PX5® is a registered trademark of International Mold Steel, Inc. and Daido Steel Limited.

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