r0-vulcan: Recycled Rubber Powder for Enhanced Comfort and NVH Reduction in Friction Materials

Family: Zero
Application: Friction materials

r0-vulcan is a sustainable and innovative solution from RIMSA, consisting of a 100% recycled ground rubber powder. It is specifically sourced from passenger car tires. This material is characterized by its black color and powder form, and is meticulously processed to ensure a controlled particle size. Notably, r0-vulcan is iron-free and has a lead content below 0.1%.

Designed as a versatile filler for friction materials, r0-vulcan’s unique properties significantly contribute to increasing comfort and improving the Noise, Vibration, and Harshness (NVH) characteristics of brake pads. Its rubber particles enhance the compressibility of friction materials, which in turn increases damping and reduces noise during braking. Furthermore, r0-vulcan plays a role in stabilizing the coefficient of friction and reducing wear, particularly at low temperatures. The material’s ability to conform to surfaces under high normal loads leads to an increased contact area and better pressure distribution. It also imparts flexibility to the brake pad, helping to prevent cracks during manufacturing or daily use.

Beyond its performance benefits, r0-vulcan embodies RIMSA’s commitment to environmental responsibility. As a completely recycled product from out-of-use tires, its use in brake pad formulations contributes to a substantially smaller carbon footprint compared to virgin rubber. This sustainable approach aligns with efforts to abate material emissions and helps in reaching aggressive decarbonization targets within the automotive sector.

Benefits:

  • Comfort and NVH Improvement: Contributes to increasing comfort in friction materials and improves Noise, Vibration, and Harshness (NVH) properties. The rubber particles give flexibility to the brake pad, preventing cracks from forming. They also increase the compressibility of friction materials, enhancing damping and reducing noise propensity during brake applications.
  • Friction Stability and Wear Reduction: Helps to stabilize the coefficient of friction and reduces wear at low temperatures.
  • Material Properties Enhancement: Rubber powder provides the ability to conform to the surface under high normal loads, increasing the contact area and distributing pressure better.
  • Cost-Effectiveness: Helps to lower the cost formulation.
  • Environmental Friendliness: As a 100% recycled product from out-of-use tires, it reduces the carbon footprint of friction materials significantly when compared to virgin rubber. Recycling rubber powder also saves energy and reduces greenhouse gas emissions.

Applications:

  • r0-vulcan is primarily used as an organic filler in brake friction materials.
  • It is specifically designed for use in friction materials to increase comfort.
  • It’s a potential substitute for virgin polymer used in brake pads.

Frequently asked questions

What is r0-vulcan and what is its main function in a friction material?

r0-vulcan is a low-cost lightweight filler (RLF) produced from high-purity recycled rubber powder. Its primary function is to improve braking comfort by reducing Noise, Vibration, and Harshness (NVH). It works by increasing the material's damping capacity, which helps mitigate the vibrations that cause squeal and judder.

How does r0-vulcan manage to improve the NVH properties of the brake pad?

Thanks to its elastomeric nature, r0-vulcan introduces micro-dampers within the composite matrix. These rubber particles absorb and dissipate the vibrational energy generated at the rotor-pad interface during braking. This, along with an increase in the pad's compressibility, decouples resonance frequencies, significantly reducing the propensity for noise.

What formulation advantages does r0-vulcan offer?

r0-vulcan allows formulators to reduce the density of the friction material and improve comfort without compromising performance. It is a cost-effective, high-performance substitute for virgin rubber powder and other NVH modifiers. Its use can help offset the hardness and noise sometimes introduced by other necessary friction components, such as hard abrasives.

Does r0-vulcan affect the friction coefficient or wear?

The primary function of r0-vulcan is not to modify friction, but NVH. It is incorporated in controlled percentages to ensure there is no negative impact on the friction coefficient or wear resistance. Its correct dosage, in synergy with other components, allows for an optimal balance between silent braking and robust, durable friction performance.

From a sustainability perspective, what is the value of r0-vulcan?

r0-vulcan is a clear example of the circular economy applied to the automotive industry. By giving a second life to end-of-life tires, it not only prevents them from ending up in landfills but also reduces dependence on virgin, petroleum-derived polymers. Its carbon footprint is extremely low (GWP of 0.08 kg CO2e), making it an ideal component for developing friction materials aligned with the strictest decarbonization goals.

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