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Urethane conformal coating is a very common conformal coating choice. However, it is not suitable for all applications. Urethane conformal coatings are not an ideal solution for applications that will be in a high-vibration environment or have a high heat requirement.

Because of the mechanical strength and resistance to abrasion that urethanes typically exhibit, a high-vibration environment could ultimately weaken the integrity of this rigid coating. Alternatively, Parylene¡¯s conformal nature and flexibility makes it better suited for this type of environment.

Urethanes do not provide the protection that is required in high-temperature environments. Leading urethanes, such as HumiSeal^? 1A33, offer protection to 125?C.  Most typical silicone coatings have a continuous operating temperature rating of 200?C, making it better suited for applications exposed to high heat.