The effectiveness of the Ultraseal series sealants has been proved under laboratory conditions in a series of tests using a powder iron Ultraseal test ring. In each case the ring was approxiamately 20 per cent porous, which included fine and gross porosity. [+]
2. Ultraseal Rotational System
This is latest technology from ULTRASEAL. Rotation of the basket is along the horizontal axis. Speed of the rotation@ 4 RPM. At the time of draining , the basket is indexed at four different stages of rotation. [+]
3. Impregnation Process
The Ultraseal Resin Transfer System (R.T.S.) employs a separate sealant reservoir and autoclave in order to achieve a dry/wet vacuum impregnation cycle. [+]
What is Impregnation?
Porosity is a phenomenon that occurs in materials, especially castings, as they change state from liquid to solid during the manufacturing process. Impregnation is a cost effective permanent solution to the problems that may be encountered as a result of such porosity. Holes or defects may be created that are too small to be seen by the naked eye and if these are permeated by gas or fluid, significant and costly quality problems can arise, even leading to the failure of the component in service through leaks or surface defects. Vacuum impregnation is the permanent solution to this problem, filling any voids with a stable yet flexible material that is resistant to attack from heat, oils or chemicals. The process is sub-surface and can be performed on raw materials or the finished machined part, causing no dimensional change or contamination to the component. Impregnation as a means of treating porosity has been employed since the 1950s, although traditional sealants such as sodium silicate or polyesters have since been replaced by more effective and environmentally friendly methacrylate based products. It is Ultraseal International's commitment to continuous improvement over the year that has convinced companies of the benefits of impregnation as a genuine quality enhancement rather than a rectification process.
Porosity can be found in many materials but is particularly prevalent in aluminium die castings, where three main types may be identified:
FLOW POROSITY, resulting in surface or internal defects caused by poor pressure conditions in the process.
GAS POROSITY, usually internal, caused by trapped gases of various kinds in the die.
SHRINK POROSITY, the most common and most difficult to control, caused by the change in volume as the metal changes state from liquid to solid.
