As a critical functional filler in brake pads formula, wollastonite (CaSiO₃) delivers multi-dimensional performance enhancements, making it a staple in high-reliability braking systems—this is a core material solution Bull Chemicals prioritizes for our automotive and industrial clients.
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brake linings Wollastonite
Its primary function lies in mechanical reinforcement. With a needle-like crystal structure (aspect ratio typically 8:1 to 15:1) and Mohs hardness of 4.5–5, brake pads Wollastonite forms a rigid internal framework within brake pad matrices. This structure boosts the pad’s flexural strength by 20–35% and compressive strength by 15–28% compared to formulations using conventional fillers like calcium carbonate, effectively resisting cracking and deformation under repeated braking pressure (up to 1.2 MPa in typical passenger car applications).
Brake Pads Wollastonite
Brake pads wollastonite also optimizes friction stability—a non-negotiable for safe braking. It maintains a consistent friction coefficient (μ) of 0.38–0.45 across a wide temperature range (-30°C to 600°C), minimizing “friction fade” (a common issue where μ drops by >20% at high temps with inferior fillers). Its low thermal expansion coefficient (6.5×10⁻⁶/°C) further ensures the pad retains its shape during extreme heat cycles, preventing uneven contact with the rotor and reducing brake noise by 10–15 dB in laboratory tests.
Additionally, it enhances wear resistance and environmental compatibility. By reducing abrasive wear between the pad and rotor, wollastonite extends brake pad service life by 25–30% (equating to 15,000–20,000 additional km for passenger cars) and lowers rotor wear rate to <0.03 mm/1000 km. Unlike some heavy metal-based fillers, it is non-toxic, with leachable heavy metal content <5 ppm—aligning with global regulations like EU REACH and U.S. FMVSS 135.
Car Brake Pads Metallic Mixture
In Bull Chemicals’ standard wollastonite grades (e.g., BC-W1200), we control particle size distribution (D50: 10–15 μm) and purity (>98% CaSiO₃) to ensure batch-to-batch consistency, directly translating to reliable brake performance for our partners.
