CN-1736 reworkable underfill encapsulant is designed to underfill 0.4mm pitch package-on-package assemblies. Has low viscosity and CTE. Reportedly has greater flux compatibility than predecessors. Has a viscosity of 650cps and a CTE of 55 ppm/°C. Rework is accomplished with temperature of 170°C to 180°C.
Zymet, www.zymet.com