Most applications requiring a rotary viscous damper must consider the temperature consequences. As the ambient temperature rises the damping fluid’s viscosity lowers and vice-versa when it gets cold. In applications that work in a range of temperatures we may take a different approach to achieve controlled damping. Multiple damping greases which complement each other when the units are exposed to temperature extremes is possible. Sometimes a combination of damping grease and springs can achieve success at high frequencies. In essence ambient temperatures need to be know when design a damper.Contact us at http://www.mmtech.us or 203-406-7900 for a free consultation.