Self-adhesive halogen-free conductive textile gaskets

Würth Elektronik now offers its WE-LT conductive textile gaskets in a halogen-free version. These gaskets have proven to be an effective solution for decreasing EMC issues in electronic devices. The gaskets feature shielding attenuation of over 80dB at 100MHz, a typical surface resistance of less than 0.08Ω, and IP54 protection against dust and water. They are halogen-free and meet the requirements of EU Ecodesign 2009/125/EC as well as the RoHS Directive. Also, they achieve a UL 94 V-0 flammability rating.

The gaskets are available in various standard profile shapes: square, as well as D, C, P, L, M, and blade profiles. The company also offers customised shapes. When two metal parts of a housing need to be conductively connected after assembly, conductive gaskets ensure electrical continuity. As a halogen-free version, the gaskets can now also be employed in displays, as the use of halogenated flame retardants in housings and stands for electronic displays is prohibited within the European Union.

These EMC gaskets consist of three main components: a metallised textile, an elastic material, and a pressure-sensitive adhesive (PSA). The metallised fabric comprises a woven polyester material with nickel-plated copper threads. The nickel plating serves to protect the copper and the EMC gasket from corrosion. It also protects against abrasion, ensuring long service life. Versions with an aluminium layer are also available. The urethane foam cores are available in various densities between 45kg/m3 and 150kg/m3. A compression ratio of approximately 30% of the original height of the EMC gasket is recommended.

In their dual function as a mechanical seal against dust and splashed water and as a means of improving EMI performance, the gaskets make an important contribution to the final assembly of displays, metal housings, control cabinets, input and output connections, and grounding connections. The company can also manufacture custom EMC gaskets in various shapes and cut-to-size formats, without any additional tooling costs.