HLD Explorer

Griffin's HLB scale (1949) works for simple oil-in-water macro-emulsions but breaks down for microemulsions, high-electrolyte systems, and temperature-sensitive formulations. Salager's HLD (Hydrophilic-Lipophilic Difference, 2000) adds temperature, salinity, and oil-structure terms that Griffin's empirical number ignores.

The HLD Explorer lets your formulator compute HLD for any surfactant + oil + salinity + temperature combination. Windsor Type I (o/w micelles, HLD < 0), Type II (w/o micelles, HLD > 0), Type III (bicontinuous microemulsion, HLD ≈ 0) are flagged automatically, with a 'fish-point' search that locates the exact temperature / salinity where a transparent thermodynamically-stable microemulsion forms.

Useful for solubilization of essential oils, delivery systems for poorly-soluble actives, clear serums, and micellar cleansers. The tool reads from a curated surfactant catalog with Cc (characteristic curvature) values and per-oil EACN (effective alkane carbon number) so you are not hand-looking-up literature values.