• Introduction
• Background
  • History
  • Process Plant
  • Recycling Sealant
• Get the Best
  • Gel Time
  • Sealant Condition
  • Temperature
  • Orientation
  • Casting Condition
  • Vacuum
  • Using Test Rings
  • Test Ring Chart
  • In Conclusion
• Standards
  • Review
  • Proposed Changes
  • MIL-1-1756C
  • Suppliers
• FAQs
• Links
• Contact

In Conclusion

The component might seal but then how well has it been sealed? This is down to the application and chemicals used. How many in industry, who have impregnation carried out, understand the process sufficiently to ensure that they are getting what they expect? The answer has to be ‘almost none’. There are no international standards to speak of, so this leaves it open to individual companies to produce their own – of course favouring the way they do things which can be meaningless to the customer. If a component fails after the process who knows whether it's the treatment or the casting that's at fault? Very often the innocent and indefensible casting gets the blame!

The answer can only lie in the integrity of the process application as a whole.

The golden rules:

• Preparation of the component – clean and dry.
• Sealant that has an effective and positive gel time.
• Degassed Sealant.
• Proper orientation of component – air locking.
• Good positive vacuum.
• Rapid cure cycle at above 90^ºC
• US MIL conformity ring as a production quality tool.