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Gap Pad Compression Percentage

Not only must the Thermal Gap Pad meet the customer’s gap range requirement from the previous table; but the Thermal Gap Pad can not be under or over compressed either. In this table, the recommended minimum and maximum compression percentages based on the Gap Pad material are shown in the table. Note the smaller gasket deflection range for the 900 series materials. So, when it comes to confirming that a Thermal Gap Pad will mechanically function properly in a gap range provided by the customer, the designer must also confirm that the minimum and maximum Gap Pad compression percentages are also within the recommended ranges shown for the material in question. Under-compression can likely lead to lower thermal performance, while over-compression can damage the Thermal Pad and/or drive out inert electrically non-conductive silicone oils which reside within the pad. Creation of silicone oil due to over compression is more likely to occur with the HCS10 and 500 series materials.

PTM Published on: 2020-01-24