A controlled melting point matrix which comprises an admixture of a substantially solid amorphous material processed by subjecting a feedstock to conditions of temperature and pressure which induce flash flow of said feedstock, and a hydrophobic material, said admixture subjected to conditions of temperature, pressure, and humidity which induce at least partial crystallization of said substantially amorphous material, whereby said hydrophobic material is captured during said partial crystallization to provide said matrix, said matrix having a slip point or flow point temperature higher than the respective slip point or flow point temperature of a mixture of said feedstock in a non-processed condition and said hydrophobic material.