FRICTION PARTICLES FOR AUTOMOTIVE BRAKES
Cardolite offers a wide variety of friction particles and resins for automotive disc brake pads and drum brake linings that reduce overall hardness, improve compressibility, reduce wear, dampen noise, and help control friction coefficient and thermal conductivity.
| Mesh Size | Brown Particle | Black Particle |
|---|---|---|
| 20-30 | NC-104-20 NX-2004-20 NX-2020-30 NX-1820 | NX-5310 |
| 40 | NX-2004-40 NC-104-40 NX-1034 NX-1035 NX-1045 | NC-108 NX-5319 NX-5319-2 |
| 60 | NX-5309 | |
| 100 or finer | NX-5207 | NX-5208 |
BROAD FRICTION MATERIAL PRODUCTS
Cardolite offers a wide range of cashew nutshell liquid (CNSL) based friction materials designed especially for passenger and commercial vehicles brakes. Disc pads and drum linings are fine tuned to provide safety (reliable and fast stop), durability (reduced brake wear), and comfort (nice brake feel without noise). In order to achieve this performance, most brake manufacturers use cashew-based friction particles as additives to increase static and dynamic friction, stabilize friction, reduce friction material and rotor wear, minimize fade, and control noise. In addition, brake formulators can use CNSL resins as binders for friction particles in order to achieve improved thermal stability and flexibility.
Brake manufacturers can choose the most appropriate friction particle or binder resin for its automotive application from a broad range of products. Selection will depend on particle size of friction dust or viscosity of liquid resin, normal or heavy duty performance requirement, and type of manufacturing process used (dry or wet) amongst other criteria.
| Properties | Brown Particles | Black Particles |
|---|---|---|
| Heat Resistance (10% decomposition) | 320 – 350°C | 360 – 390°C |
| Heat Resistance (50% decomposition) | 410 – 440°C | 520 – 560°C |
| Recovery | 1.4 – 1.9 mm | 1 – 1.5 mm |
| pH Value | 4 – 10 | 2 – 7 |
HEAT RESISTANCE AND COMPRESSIBILITY
Brown friction particles are available in many particle sizes and are mainly used in disc and drum brake applications. Standard brown particles help stabilize friction coefficient in the 150°C and 300°C temperature range. They are a great choice to help control wear and surface hardness in normal duty applications. For higher demanding applications or very specific end-uses, Cardolite also has a range of specialty brown particles each with their own unique characteristics. For example, an abrasive modified brown particle is available that has the ability to cushion the abrasive to help control noise. The abrasive content also allows the compounder to slightly increase the friction coefficient when needed.
Black particles, also available in many sizes, generally find use in high performance and heavy duty applications. In these applications, where high temperatures are reached by high energy stops, black friction particles help to dissipate heat across the surface to avoid hot spotting that lead into fade. They also contribute to wear reduction and help to control the overall surface hardness. These particles are mainly being used in heavy duty brake pads and linings, train blocks and clutches. Other friction material applications having intermediate to higher thermal conductivity may find black friction particles beneficial.