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The Value of Vacuum Impregnation

Vacuum impregnation methods ensure metal and electronics parts of vehicles are fully sealed against fluids, gases and other external influences and ready for just-in-time assembly. After impregnation, all parts are clean, free of corrosion or oxidation, and are ready for use without post-treatment. LOCTITE® vacuum impregnation solutions provide resins that cure to an impermeable thermoset polymer. This makes it possible to permanently seal pores or leakpaths to enable quality lightweight, thin-walled die-casted parts or electronic components.

Impregnation Process

With an unmatched portfolio of LOCTITE® products and our fully automated vacuum impregnation methods, we can ensure that customers no longer face the negative effects of porosities, including cost of scrapping, loss of production, dissatisfied customers or even lost business. Our state-of-the-art impregnation process technology gives you a permanent and reliable sealing solution to the problems of porosities and leakages.

Step 1: Vacuum

Vacuum impregnation equipment includes dry and wet vacuums used to prepare the impregnation resin. The absence of liquid within the dry vacuum method ensures no interference with degassing the pores. Within the wet vacuum method, penetration of the impregnation resin into the part takes place at atmospheric pressure, enabling rapid processing. Once prepared, the impregnation resin fills porosities, shrinkage cavities, capillary pores and cracks to ensure resistance to external influences.

Step 2: Centrifuge

Excess sealant is removed from part surfaces through a drip-off and spin process; the most effective method for removing excess sealant with no risk of damage to the parts, while requiring very little time.

Step 3: Wash

Parts are washed, using the oscillator for agitation, and the centrifuge prepares for the rinsing step. Compressed air agitation in the water also may be used.

Step 4: Rinse

Parts are rinsed and the centrifuge prepares for the curing step. When exposed to the activator rinse, sealant at the pore entrances will cure quickly, creating a “plug” that prevents remaining liquid sealant from escaping while it continues to cure slowly by the anaerobic system.

Step 5: Cure

Parts are soaked within a final rinse tank of water at 90°C (metal impregnation) or 50°C (electronic impregnation), removing the activator solution, and quickly drying and curing the part.

Vacuum Impregnation Products

Henkel’s LOCTITE® brand has a variety porosity sealants specifically made for metal casting and powder metal applications. The LOCTITE® product line includes liquid sealants for the effective sealing of various automotive parts. LOCTITE® porosity sealants effectively to remove air and then seal pores, helping prevent against air and fluid leaks throughout automotive systems.

Porosity sealant materials are applicable to different automotive areas such as the powertrain systems, air conditioning, hydraulic systems, and other power and fluid systems. Our porosity sealants provide high chemical resistance and are cleared from the surface with just water.  

Vacuum Impregnation Services Options

Henkel offers on-site impregnation service centers, which includes the temporary installation of a small customized impregnation center directly on their site. Capital investment, products, process controls and labor belong to Henkel, directly on-site for fast and high-quality impregnation.

For customers that do not require a service center on-site, all of the advantages of Henkel sealing solutions are available from our external impregnation service centers - conveniently located around the world.

The Benefits of Impregnation

Process Optimization
  • Fast Processing time and high capacity for impregnating high volume parts
  • Fully automated system ensures constant high-quality performance
Cost Reduction
  • Designed for broad spectrum of parts without costs for specific fixtures
  • Space-saving footprint (645 sq. ft./60m²) 
  • Environmentally-friendly: recycling performance drastically reduces resin and waste water
Safety & Comfort 
  • Enclosure and extraction ensures low noise pollution and emission to protect employees and hardware
  • Fully automated system ensures high safety level

Vacuum Impregnation Equipment Options

A variety of equipment options are available for casting impregnation methods, including the LOCTITE® Circular Sealing System, the LOCTITE® Modular Sealing System and the ability to create customizable equipment, based on customer needs and specifications.

LOCTITE® Circular Impregnation System (CIS)
Well suited for high-volume, fully automated impregnation solutions, the LOCTITE® Circular Impregnation System functions in five steps, beginning with parts placed in processing baskets and positioned in the CIS loading station.

LOCTITE® Modular Sealing System
Offers production flexibility at an affordable investment price. Can function as a manual system or fully automated robotic system.

FARASEAL: Electrical and Electronic Vacuum Impregnation

Microscopic voids are inherent in many electronic assemblies, particularly where metals and plastics are assembled together. Our FARASEAL process seals even microscopic gaps and leak paths in critical electrical and electronic components, permanently sealing them from moisture, solvents, fluxes and other corrosive agents.

FARASEAL Applications:

  • Connectors
  • Sensors
  • Plugs
  • Coils and solenoids
  • Pastic housings
  • Plastic covers
  • Over molded electronics
  • Cables
  • Wire harness

Die Cast Vacuum Impregnation

Metal casting impregnation allows you to make use of parts that would otherwise have to be scrapped due to structural defects. Our products have been developed to deliver consistently clean, leak-proof and sealed parts ready for just-in-time assembly.

Casting Impregnation Applications: 

  • Engine blocks
  • Cylinder heads 
  • Engine covers
  • Transmission cases
  • Compressor components
  • Cooling/oil pumps
  • Crank case
  • Torque converter housings
  • Oil pans

Further Resources

Introduction to Impregnation Terminology

Vacuum Impregnation for Electronic Components

Vacuum Impregnation for Cast Metal Parts

Seal of Quality: High-Quality Impregnation Products and Services

Impregnation Fluid Compatibility Chart

Permanent Sealing for Automotive Electronics