Sil-Pad 400 Die Cutting

Sil-Pad preformed, die-cut

NEDC has been converting thermal products essentially since its advent in 1982. One of the products that is the most enduring is Sil-Pad 400 by Henkel’s Bergquist. This product was actually the original Sil-Pad. This pad was created for products with thin gaps that had the luxury of pressure to create less thermal impedance. This material exhibits great properties with a silicone binder that is reinforced with fiberglass to become a thermally conductive workhorse.

Sil-Pad 400’s use of silicone rubber makes it incredibly durable in electronic applications. For example, it has a great flame rating, is non-toxic, and has a continuous temperature range of -76°F to 356°F. In addition to these properties, Sil-Pad 400 also exhibits great physical properties, such as tensile strength and elongation. The fiberglass reinforcement provides great resistance against sharp objects that may be present during the assembly process.

Sil-Pad 400 is commonly used to isolate power sources from heat-sinks. Its thermal conductivity of 0.9 W/m-K, while on the lower side in comparison to some other pad products, still pays great dividends in lower thermal impedance due to the 7 and 9 mil thicknesses offered. Sil-Pad 400 is used in power supplies, power semiconductors, automotive electronics, and motor controls. As an economic thermally-conductive insulator, Sil-Pad 400 is commonly used as a go-to product in many other thermal applications as well.

The standard color of Sil-Pad 400 is a refined gray. NEDC commonly die-cuts parts out of these materials in custom non-standard shapes. Sil-Pad 400 is available with pressure sensitive-adhesive on one side or both sides. This material is available in certain gauges ranging from .007″ to .030″. Sil-Pad 400 is normally available in 12″ x 12″ sheets or roll form. For more information on Sil-Pad 400, or if you believe you have an application that could utilize it, please contact

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