Apple Rubber's Seal Design Guide

EMI Shielding

Electromagnetic interference (EMI) is composed of both electric and magnetic components, and either can be the source of interference. Often, it is critical to shield electronic devices from EMI which is done via either reflection or absorption. By the suspension of conductive fillers such as silver or nickel in the elastomer binder, a compound suited for shielding or grounding is available for service.

Best Choice(s)

Silicone and Fluorosilicone are two of the most common shielding elastomeric materials and are used throughout aircraft components, medical equipment and the computer industry. Also, Fluorocarbon and EPDM are used in EMI service and all compounds can be molded into endless profiles with various degrees of shielding effectiveness, depending on the employed binder and fillers.

Please contact Apple Rubber for a list of common materials used and specifications.

Apple Rubber Products, Inc. • 310 Erie Street • Lancaster, NY 14086 • 1.800.828.7745

1. Introduction

2. Products & Services

3. O-Ring Basics

4. Seal Types & Gland Design

5. Critical Operating Environmental Factors

6. Material Selection Guide

7. Special Elastomer Applications

8. Troubleshooting

9. Sizes & How to Order

10. Glossary of Terms

11. Rules of Thumb

12. Formulas

13. Seal Glossary

14. Bibliography / Trademarks