Product category:
Enclosures and Equipment Cooling Fans
News Release from: Chomerics Europe | Subject: Premier TM
Edited by the Engineeringtalk Editorial
Team on 12 November 2004
Shielding materials give engineers more
choice
Chomerics has enhanced and redefined its range of Premier TM conductive plastic shielding materials.
Chomerics has enhanced and redefined its range of Premier TM conductive plastic shielding materials The increased choice means that engineers can choose the material that accurately matches the shielding and mechanical requirements of their application, therefore avoiding over-design and unnecessary cost
This article was originally published on Engineeringtalk on 23 Mar 2001 at 8.00am (UK)
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Premier shields give weight, cost and space savings as well as greater design freedom and improved strength compared to most other existing shielding applications and other existing shielding approaches claimed Chomerics.
Designs with wall thicknesses down to 0.8mm can be achieved using the abrasion and corrosion resistant materials.
By having its shielding functions integrated, the need for costly supplementary processes such as plating and painting are alleviated said the company.
Further reading
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The new Clip-Shield range of clip-on EMI shielding gaskets from Chomerics have been designed for enclosure applications requiring both high levels of shielding and resistance to outdoor environments
Form-in-place conductive elastomer cuts stress
Suited to encapsulating electronic devices, the latest form-in-place flexible, thermally conductive silicone elastomer from Chomerics offers high thermal conductivity
HT versions are suitable for continuous use at 85 degrees C with short-term excursions to 100 degrees C.
The ST derivative meanwhile is suited to more demanding applications and has a continuous operating temperature of up to 105 degrees C and short-term capability to 115 degrees C.
Both HT and ST versions are available in a choice of three compounds that give increasing levels of shielding performance.
Basic performance is given by A220 material, A230 delivers intermediate shielding, whilst for the most demanding applications, A240 offers up to 85dB attenuation.
The mechanical performance of the various materials is also different, with higher shielding performance versions being stiffer (having a higher modulus) than lower attenuation variants.
Premier plastic shielding materials use a blend of polycarbonate and ABS engineered for stable electrical, mechanical and physical performance.
Using a proprietary process the base material is filled with long fibres of nickel-plated carbon; the process ensures dense dispersion, random orientation and full engagement of the fibres to give optimum shielding performance.
The inclusion of design features such as internal compartments means that a single Premier part can accommodate multiple logic and RF components in a single shield.
This helps to further reduce the shielding solution cost and eases assembly it is claimed.
In many applications satisfactory performance can be achieved by grounding a shield directly onto a PCB trace.
For applications that require a conformable dispensed or moulded gasket interface, the shields are fully compatible with the Chomerics range of form-in-place and moulded gasket materials.
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