The type segmentation categorizes 1,2‑alkanediols by carbon chain length and functional properties, principally 1,2‑propanediol, 1,2‑butanediol, 1,2‑pentanediol, and 1,2‑hexanediol. 1,2‑Propanediol, the shortest chain, offers high water solubility and low toxicity, making it the preferred choice for aqueous skin‑care systems and where regulatory thresholds are stringent. 1,2‑Butanediol provides a balance of solvency and viscosity control, frequently selected for hair‑care conditioners and emulsions requiring moderate thickening. 1,2‑Pentanediol introduces enhanced antimicrobial activity and a broader solubilization window, supporting its adoption in color cosmetics and sun‑care where UV‑filter integration is critical. 1,2‑Hexanediol, the longest chain, delivers superior oil‑phase compatibility and stronger preservative effects, driving its premium positioning in high‑performance anti‑aging and personal‑care formulations. Each subtype’s distinct physicochemical profile determines its market share contribution, with 1,2‑hexanediol and 1,2‑pentanediol together accounting for roughly 55% of total sales due to their multifunctional advantages.