Free Space Dielectric Property Extraction for Automotive Radar Polymer Enclosures
Precision W-band free-space extraction of polymer permittivity prevents radar boresight shift and avoids costly Class II Permissive Change re-testing delays.
Moisture Absorption ISO 62
Meaning
Standardized test procedure determines the amount of water absorbed by plastics when exposed to humid environments or immersed in water. In the electronics industry, moisture absorption iso 62 provides the data required to predict how environmental exposure affects the dielectric properties of polymer housings. This standard defines the conditions for preconditioning plastic specimens to ensure consistent results.
Standard Testing
Polymers absorb water over time, which increases their weight and alters their chemical structure. Under moisture absorption iso 62, specimens are dried in an oven and then placed in a controlled water bath at a specified temperature. The weight change of the specimen is measured at regular intervals until saturation is reached.
Dielectric Drift
Water has a high permittivity and loss tangent compared to most polymers. A high rate of moisture absorption iso 62 indicates that a material will experience drift in its dielectric properties when used outdoors. This drift changes the resonant frequency of radomes and can degrade the signal strength of integrated antennas.
It can also cause physical swelling that stresses the sealed joints of the device housing.
Environmental Test
Simulating outdoor conditions is necessary to verify the lifetime performance of wireless enclosures. Engineers use the results of the standard test to choose materials that maintain their electrical properties under high humidity. This selection process protects the long-term functionality of safety systems and communications modules.