Friction Products- milled glass fibers, milled mineral wool, wollastonite, mica.

Application Guide: Friction (Brake Systems) Products

Background:

Friction brake systems (disc or drum) are those components in which forces work to directly oppose a vehicle's tendency to move. Components of the friction material formulation typically include fibers, organics, fillers, lubricants, resins and abrasives. Because of its significant reinforcement and heat resistance, asbestos historically played a major role. Non-asbestos organic (NAO) friction materials can include: clutch facings, linings, blocks, and disc pads. In recent years, this mineral has been replaced by more "health-friendly" alternatives, such as mineral fibers (natural and synthetic).

Important goals in friction systems include noise control, improved rotor and drum wear, vibration control, and product life improvement.

Products For Selection:	Features	Benefits
Milled Glass Fibers	Short fiber lengths Wide variety of grades	Reinforcement Micro-crack control Balance of properties to application
Wollastonite	Natural mineral High purity	Improved wear Improved processing Asbestos replacement Favorable economics vs. other minerals or glass options
Muscovite Mica	Processed & treated in U.S. Complex silicates chemistry Low shot content Low moisture Small diameter with long lengths	Excellent economics Excellent bonding to matrix Processability Noise control Improved wear Thermal stability Low rotor wear Reduced corrosion risk Dimensional stability and micro-crack control
Microwool: Processed Mineral Fiber	Low bulk density Complex silicate chemistry Small diameter with long lengths Processed and surface treated in the U.S.	Lower weight parts Lower wear on processing equipment Good physical properties Excellent compatibility with standard polyols Excellent economics

Suggested Loadings:

Product	% By Weight
Microglass	4 - 18
Wollastonite	7 - 25
Microwool	4 - 20

Expected Observations:

Overall wear improvement with low noise, low vibration, and acceptable friction stability are achieved when reinforcing fillers are utilized. In some systems, milled glass may not be suggested due to melt concerns. The suggested replacements are wollastonite or mineral fiber or a combination. Selection of appropriate surface treatments can improve wet-ability and bonding.

Final determination of the suitability of the material for the use contemplated is the sole responsibility of the user. Manufacturer's only obligation shall be to replace such quantity of the product proven to be defective.