Fumed silica A-200 (a hydrophilic fumed silica with a specific surface area of 200 m²/g ± 25 m²/g) is widely valued in the lubricants industry for its exceptional ability to modify rheology, improve stability, and enhance performance. Its nanoscale particle size (typically 7-40 nm) and high surface area (200 m²/g) make it a versatile additive for addressing various challenges in lubricant and grease formulations.
Here are specific application examples demonstrating its role:

1. Grease Thickening and Rheology Modification
Application: As a thickening agent in specialty greases, particularly where traditional lithium or polyurea thickeners are unsuitable.
Example: In high-temperature greases for steel mill bearings (operating up to 300°C), A-200K (10-15% wt) is dispersed in silicone oil or PAO base oils.
Benefits:
Provides excellent thermal stability (no melt point degradation).
Maintains consistency at high temperatures (NLGI grade unchanged after 1000h at 200°C).
Imparts thixotropy: grease stays in place yet shears easily under load.
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