Spring aids made of Micro Cellular Polyurethane (MCU) can absorb high loads from road events like potholes and speed bumps while also helping the spring system support the vehicle handling characteristics.

MCU spring aids absorb energy from the road and support vehicle handling. With our patented soft entry and linear response, our spring aids help avoid impact harshness while offering a cost efficient alternative to a progressive spring system.

These spring aids typically carry loads over 75 percent of the time, as they are always active in entry, mid, and maximum suspension loading. They are most common in coilover applications.

Vibracoustic can offer multiple MCU material and design options, including assembly with bumpers, dust covers, and saturation cups, or as part of complete air springs.

Another benefit of using Micro Cellular Polyurethane (MCU) is that it can be easily tuned and optimized simply by changing the material’s density. Once the geometry is developed through our standard FEA methods, there is usually no need to change chemistries, or part geometry, which results in 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.