brake pads Nitrile Butadiene Rubber (NBR) is a vital binder and elastomeric component in brake pads formula, critical for integrating fillers and optimizing braking performance—Bull Chemicals prioritizes high-grade NBR to ensure end-product reliability.Its unique copolymer structure delivers four core benefits.
Table of Contents
First, adhesive bonding
NBR’s polar nitrile groups enable strong adhesion to inorganic fillers (e.g., calcium carbonate, alumina) and metal backplates. With a peel strength of 3.5-4.5 N/mm, it prevents pad delamination, a key failure point under cyclic stress.
Second, flexibility and impact resistance
With a Shore A hardness of 65-80, NBR maintains elasticity at -30°C to 120°C, absorbing shock during abrupt stops. This reduces pad fragmentation risk by 25-30% compared to rigid binders.
Third, oil and heat resistance
NBR resists degradation from brake fluid (glycol-based) and lubricants, retaining 90% of its tensile strength after 100 hours of oil immersion. It also withstands short-term temperature spikes up to 150°C, aligning with brake operating conditions.
Fourth, friction modulation
When added at 8-12% by weight, NBR balances the pad’s friction coefficient (stabilizing it at 0.35-0.45), avoiding excessive rotor wear while ensuring consistent stopping power.
Bull Chemicals’ NBR complies with strict specifications: acrylonitrile content 33-36%, Mooney viscosity (ML1+4, 100°C) 45-55, and ash content ≤0.3%. These parameters guarantee uniform dispersion in brake pad compounds, maximizing the material’s functional value for safe, durable braking systems.
