"AquaProp" Ltd
Vacuum impregnation of micro porosity in castings.
Mechanical seals and plain bearings.
There are around 50 different defects that could appear after molten metal alloy solidifies in casting. Majority of those defects originate from different technological fluctuations, but one of them appears because alloy consists of several metals with different crystallization temperatures – and that is micro porosity. Several methods allow reducing micro porosity, but it is doubtful to eliminate it. And when the part is intended to contain gas or liquid under pressure one has to fight porosity after component is finished with machining. The best known today solution of this problem is vacuum impregnation by synthetic resins. It is a quick and simple way to make components pressure tight and it does not influence dimensions or functionality of components.
Though vacuum impregnation was principally introduced more than 50 years ago it becomes more and more popular these days after new resins with different polymerization cycles were developed. Casting impregnation reduces costs and provides better quality in automotive, aviation, shipbuilding, oil and gas industries.