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White Papers Home | Hardware Mechanical Force Considerations in the Use of EMI-Environmental Gaskets Publisher: Spira Manufacturing Corp. View Company Profile View Hardware Suppliers View Hardware Guides Format: PDF Date: 2007-08-29 View all Spira Manufacturing Corp. White Papers Overview: Selection of Gaskets available for EMI shielding, and the selection of fasteners based on the space and force required to ensure EMI and Environmental sealing quality is a significant challenge to the Design Engineering Community. The type of the fastener to be employed in holding a cover or door tight against the gasket seal, and the spacing of the fasteners are presented in this paper as the critical factors associated with the cost and maintainability. Four deflection and force equations that can be employed in determining the fastener spacing are detailed, illustrating the force effects based upon the variables associated with the gasket to be used. Variable values to be used in the equations are listed in a tabular form, presenting the results of the analysis on varying gasket materials, and cover plate thickness in the form of graphs. TABLE OF CONTENTS 1. Introduction 1 2. Defletion and Force Equations 2 3. Conclusion 4 4. Selected Bibliography 4 5. Appendixes 5.1 Appendix A 4 5.2 Appendix B 5 6. Figures 6.1 Typical Gasketed Cover Plate and Associated Views 1 6.2 Loading of Cover Plate by Gasket 2 6.3 Various Cover Plate Arrangements 2 6.4 Fastener Spacing vs. Fastener Force using Spira Shield & Spira Strip Gasket Material- Covers are Flat 5 6.5 Fastener Force vs. Fastener Spacing for EMI and Moisture Sealing using O Ring Spira Combo and Basic Spira Combo Gasket Materials 6 6.6 Fastener Force vs. Fastener Spacing for EMI and Pressure Sealing using O Ring Spira Combo Gasket Material 6 6.7 Fastener Force vs. Fastener Spacing for EMI and Pressure Sealing using Spira Strip Gasket Material 6 7. Tables 7.1 Force and Deflection Variables for the Spira Shield, Spira Strip and O Ring Spira Combo Gaskets 2 7.2 Force and Deflection Variables for the Basic Spira Combo Gaskets 2

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