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Henkel Adhesive Technologies

Henkel Adhesive Technologies

Vacuum impregnation

Discover our vacuum impregnation services and ensure metal and electronic automotive parts are sealed against harsh environmental elements.
6 min.
Butler with impregnated electronic components on tray
Butler hand wearing white gloves with floating black electronic component and red wire.

Why use vacuum impregnation

LOCTITE® vacuum impregnation services use resins that cure into an impermeable thermoset polymer, permanently sealing pores or leak paths. This ensures parts are clean, corrosion-free, and ready for use without post-treatment, enabling the production of quality lightweight, thin-walled die-casted parts or electronic components.

Impregnation process

The vacuum impregnation process guarantees the complete sealing of metal and electronic automotive parts against fluids, gases, and other elements, preparing them for just-in-time assembly. With our LOCTITE product range and vacuum impregnation services, we eliminate porosity-related concerns, lowering costs, production setbacks, and customer discontent.

Our impregnation process

Two red circular arrows referring to Step 1 of the metal vacuum impregnation process.


There are two impregnation methods that can be used: dry or wet. In the dry vacuum method, the absence of liquid guarantees no disruption to the degassing of pores. The wet vacuum method uses atmospheric pressure, allowing the impregnation resin to rapidly fill porosities, cavities, capillary pores, and cracks, ensuring resistance to external influences.

Two red circular arrows, referring to Step 2 of the LOCTITE Circular Sealing System for metal vacuum impregnation.


A drip-off and spin process using a centrifuge, efficiently removes excess sealant from part surfaces. This step is highly effective in eliminating excess sealant without posing any risk of damage to the parts and requires minimal time.

Red circular arrows above two arrows pointing up and down referring to Step 3 of the metal impregnation process.


The parts are washed with the oscillator providing agitation, while the centrifuge prepares for the rinsing step. Another option is to use compressed air agitation in the water.

Red circular arrows above two arrows pointing up and down referring to Step 4 of the metal impregnation process.


After rinsing the parts, the centrifuge readies for the curing step. When exposed to the activator rinse, the sealant at the pore entrances will rapidly cure, forming a "plug" that hinders any remaining liquid sealant from escaping. The slow curing process continues through the anaerobic system.

Two red circular arrows with 90 degrees Celsius in text underneath on the left and 50 degrees on the right, referring to Step 5 of the vacuum impregnation process where parts are soaked in water to remove the activator solution then the parts are dried and cured.


The parts are immersed in a final rinse tank filled with water at 90°C (for metal impregnation process) or 50°C (for electronic impregnation). This process removes the activator solution, ensuring rapid drying and curing of the part.

Benefits of vacuum impregnation

Process optimization


Cost reduction


Safety and comfort

Impregnation services options

The benefits of our vacuum impregnation technology are accessible through impregnation service center affiliates located across North America, including Baron Industries, Industrial Finishing, Metaplastics, Nebraska Aluminum Castings and St. Mary’s Metal Finishing.

Butler with white gloves holding tray with powertrain and electronic impregnation components.
Butler pushing a cart with an impregnated casting component.

FARASEAL: electronic vacuum impregnation

Microscopic voids are naturally present in numerous electronic assemblies, especially in the assembly of metals and plastics. Our FARASEAL resin impregnation process effectively seals even the tiniest gaps and leak paths in vital electrical and electronic components, providing a permanent barrier against moisture, solvents, fluxes, and other corrosive agents.

FARASEAL applications:

Butler pushing a cart with impregnated electronic components.

Die cast vacuum impregnation

Metal casting vacuum impregnation enables the salvage of parts that would otherwise be discarded due to structural defects. Our products are designed to consistently deliver clean, leak-proof, and sealed parts, prepared for just-in-time assembly.

Casting impregnation applications:

Further resources

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