SNE-540-R and SNE-556-R are 40 and 65 durometer (Shore “A”), respectively, and have low volume resistivity that challenges silver coated aluminum filled silicones at a fraction of the cost.
SNE-540-R and SNE-556-R have conductive fabric reinforcement that enhances the conductivity and tensile strength but still allows for Z-axis compression for EMI and environmental sealing. Traditional, particle filled silicone rubber materials have lower strength due to the heavy loading of conductive filler. This lower strength is often problematic for gaskets with thin walls that are susceptible to breaking or over stretching. The fabric reinforcement in SNE-540-R and SNE-556-R addresses these issues.
Additionally, SNE-540-R and SNE-556-R fabric reinforced EMI silicones are manufactured in continuous rolls (12″ and 15″ wide) which enable large EMI gaskets to be made in one piece. Standard thicknesses for SNE-540-R and SNE-556-R are .020″ and .032″, custom thicknesses are also available.
See the Highly Conductive Reinforced Nickel Graphite Filled Silicone section of the EMI Sheilding Materials page for more details, and view the SNE-540-R data sheet (PDF) and SNE-556-R data sheet (PDF) for additional technical information.