Porosity Categories

How Vacuum Impregnation Works :

• The Problem :
  Inherent to all Metal Casting, (ferrous-nonferrous) Micro Porosity Can led to leak paths Which in time, can lead to leaking parts and ultimate part failure.
• The Process :
  Customer provides metal casting for processing these parts are placed in batches into a processing basket and than placed into a vacuum pressure vessel where a vacuum is drawn. This process evacuates all air within the microscopic voids within the casting wall, opening fine leak paths making the voids receptive to being filled.

Upon releasing the vacuum, a low-viscosity resin is then introduced filling the internal leak paths. In some processes, pressure is added at the end of the cycle driving the resin deeper into the part. After vacuum impregnation cycle,polymerization of the resin occurs via an anacrobic (in the absence of air ) cure of thermal cure. Since polymerization only occurs in the absence of air, or the introduction of heat, all surface resin will be completely removed via an aqucous wash with original properities and appearance still in tact.