Loctite 3872 is a self-shimming, thermally conductive acrylic which cures to a low modulus thermoset adhesive. It is designed to provide almost instantaneous fixturing by UV fillet curing to prevent horizontal movement during handling prior to and during the full heat cure process. LOCTITE® 3872 is a self-shimming, thermally conductive acrylic which cures to a low modulus thermoset adhesive. It is designed to provide almost instantaneous fixturing by UV fillet curing to prevent horizontal movement during handling prior to and during the full heat cure process. A uniform bondline thickness of 0.127mm results from the incorporation of solid glass spheres. This product combines high modulus and high shear strength with good electrical isolation and high thermal conductivity. Recommended applications include the bonding of various heat generating devices (power devices) to their respective heat sinks. A typical application would be the bonding of of a silicon chip to a metal lead frame. This product is recommended over the high modulus product in applications which see wide thermal cycle.