Fluid Dynamic
Fluid dispensing control parameters establish hydro-static force thresholds exerted during encapsulation of electronic assemblies. In electronic protective packaging, silicone potting pressure measures the mechanical force applied by liquid polymer during mold filling and curing. The parameter governs fluid delivery into component cavities, stopping short of evaluating cured polymer shore hardness or chemical resistance.
Cavity Fill
Infusion rate determines liquid distribution around complex component geometries and under delicate wire bonds. When dispensing force exceeds nominal limits, hydraulic pressure damages fine electrical connections or shifts component alignments. Vacuum-assisted potting reduces required injection force while eliminating trapped air voids.
Cure Expansion
Volumetric expansion during elevated-temperature curing cycles generates internal mechanical stress against enclosed electronic components. Two-part silicone formulations expand or contract based on cross-linking density and thermal profile control. Excessive internal force damages fragile ceramic capacitors or ruptures glass diode bodies inside the encapsulated module.
Pressure transducers embedded inside test molds monitor real-time force development throughout heating and cooling phases. Differential thermal expansion between curing silicone resin and housing walls creates mechanical shear at interface boundaries. Optimizing cure temperature profiles reduces peak pressure spikes while ensuring complete polymer cross-linking.
Outgassing under high pressure creates microscopic voids that impair dielectric isolation properties. Controlled pressure profiles maintain module structural integrity while ensuring full cavity encapsulation.
Seal Integrity
Internal pressure drives liquid silicone into narrow gaps around connector pins and housing seams before curing begins. Proper force management prevents material leakage past primary gasket seals while ensuring total substrate coverage. Viscosity variations require real-time pressure adjustment during continuous automated dispensing operations.
