Standard Ingress Protection Test Methods for Sensor Housings
Verify IP ratings using accredited ISO/IEC 17025 test dossiers with Category 1 vacuum suction and thermal pre-conditioning differential immersion steps.
Elastomeric Seal Compression Set
Material Property
Evaluation of permanent deformation provides a measure of how well a polymer returns to its original thickness after prolonged loading. Practitioners calculate elastomeric seal compression set by measuring the initial thickness and comparing it to the thickness after a sample is compressed and released at specific temperatures.
Mechanical Strain
Constant displacement is typically maintained for 22 or 70 hours inside a fixture. Because elastomeric seal compression set depends on the cross link density of the material, a low value indicates that the seal maintains its contact force over time.
Thermal Influence
Heat accelerates the chemical changes that prevent a gasket from recovering. High temperatures increase the measured elastomeric seal compression set by promoting additional cross linking or chain scission.
Sealing Efficiency
Standardized test methods like astm d395 define the procedures for quantifying elastomeric seal compression set to ensure the long term reliability of pressurized enclosures. Leakage occurs when the material can no longer fill the gap between mating surfaces. A seal that fails to recover its shape loses the contact pressure required to exclude water or dust, making this value a primary indicator for lifecycle prediction in static applications where vibrations or thermal cycles are present.