BioTherm Fluids AF (Formerly IceClear AF) is a non-toxic, non-glycol, biobased glycerin anti-freeze / heat transfer fluid with a food grade multi-metal corrosion inhbitor which, as is, meets ASTM D1384. Made with highly refined materials, AF is NSF registered with an HT1 rating, allowing use where incidental food contact is possible. AF is specifically formulated as an alternative to petroleum derived 50% propylene glycol (PG) based anti-freeze fluids for industrial, non-engine applications, especially those with environmental concerns: Fountain/Water Line Winterizer, Directional Drilling Fluid, Pressure Testing, Ballast Fluid, Chiller Fluid, All Season Dust Suppressant. AF is also supplied without the corrosion inhibitor package under the name BioTherm Fluids PGX (formerly IceClear PGX). AF is glycerin based and does NOT contain ethylene glycol.