Micro Cellular Polyurethane (MCU) top mounts are used for the wheel-controlling connecting links that reduce the transfer of dynamic loads from the suspension into the chassis, isolate road noise, and more effectively react shock loads with high amplitude damping combined with a long linear rate response.

MCU top mounts perform two basic functions. They reduce the rolling noise in the vehicle and react the shock inputs such as driving over bumps or potholes. Overall, they help improve the vehicle comfort and handling characteristics.

Top mounts with spring seats made of MCU help to isolate tire noise. And thanks to the high-volume compressibility of MCU, the housing size can be reduced, which has positive knock-on effects on costs, weight, and space requirements.

Vibracoustic can offer multiple MCU material and design options, including full top mount assemblies. Low temperature MCU material and multiple rubber material options are available as needed for each customer application.

Another benefit of using Micro Cellular Polyurethane (MCU) is that it can be easily tuned and optimized by changing the material’s density. There is usually no need to change chemistries or part geometry, providing a cost and time efficient development process.

About MCU Components

Micro Cellular Urethane (MCU) components combine maximum performance, high comfort and lightweight versatility. The material provides superior abrasion, tear and chemical resistance along with high tensile strength and a low compression set. It is also resistant to automotive fluids and ozone. MCU components are used for jounce bumpers, spring aids, spring seats, bushings, top mounts, and body mounts.


The automotive industry needs to meet the increasing demand for lighter vehicles while integrating new components, like hybrid drives. As a result, the space available for a vehicle’s spring and isolation elements becomes smaller. Vibracoustic’s engineers work closely with vehicle manufacturers to supply a full range of materials that combine maximum performance within the ever decreasing available space.

MCU helps fulfill these requirements. Similar to a sponge, MCU absorbs energy and isolates noise, yet is strong enough to bear the weight of an entire vehicle. MCU components also offer a low weight, progressive stiffness with excellent long-term behavior when subjected to cold, heat, and the environment.

Vibracoustic offers multiple material and design options, including assembly with dust covers and saturation cups or as part of complete components like top mounts and air springs.