Segmentation by type classifies Aluminum Oxide Polishing Fluids into water‑based, solvent‑based, and hybrid formulations, each addressing distinct process constraints. Water‑based fluids, representing roughly 45 % of the market, are favored for environmentally regulated facilities and provide low‑contamination polishing for delicate glass substrates. Solvent‑based fluids, comprising about 35 %, deliver higher removal rates and are preferred in high‑throughput mirror and laser‑window production where rapid material removal outweighs solvent handling concerns. The remaining 20 % falls under hybrid fluids that combine aqueous carriers with organic co‑solvents to balance removal efficiency and surface integrity, targeting specialty applications such as prism polishing and fiber‑optic end‑face finishing. Within each type, sub‑categories—high‑purity, low‑scratch, and high‑removal‑rate formulations—further refine product selection, enabling manufacturers to align fluid chemistry with specific tolerance windows and throughput targets. This typology underpins the market taxonomy and informs strategic sourcing decisions across the optics supply chain.