sol fraction
Mass fraction of the dissolved or dispersed material, resulting from a network-forming polymerization or crosslinking process, that is constituted of molecules of finite (statistically definable) relative molecular masses.
PAC, 2007, 79, 1801 (Definitions of terms relating to the structure and processing of sols, gels, networks, and inorganic-organic hybrid materials (IUPAC Recommendations 2007)) on page 1806