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Cheil Industries Inc. Design Guide for Thin Wall Product Design Guide For Thin Wall Products Design Concept Material selection Goal Low weight Goal Minimum Size Thin wall Reduction of Cycle time Optimum Design High Productivity Saving Material Processing technology Cheil Industries Inc. RD, Application Development Center 2 Last Updated DEC 07 1999 Design Guide For Thin Wall Products Material selection Requirement Thick Thin High Flow Length Resin Flow length: Spiral Flow(L/T) 100:1 ~ 150:1 200:1 High Impact Strength Notch Izod Impact Test, Low Temperature Impact Test Good Appearance Low Gloss, UV Resistance: deltaE 1~2 Neat engineering Plastics: Flexural Modulus- 2,000MPa Stiffness Reinforced plastics : Flexural Modulus- 3,500~ 14,000MPa o Heat Resistance UL Relative Thermal Index(RTI): 70 ~ 95 C Mechanical Integrity Design for assembly : Snap fit, Small Screw, Ultrasonic Welding Flame Resistance Mobile Phone : UL HB, Portable PC: UL94 V-0~V-1 Cheil Industries Inc. RD, Application Development Center 3 Last Updated DEC 07 1999 Design Guide For Thin Wall Products Shrinkage