Metal vacuum sealing

How we work

Reliable absolute quality solutions

The Fonderia Cunio is been active in the Brescia area for over 20 years in the metal pieces sealing or plastic pieces when they prove to be porous. Sealing is used to solve all the problems that can be created after the melting process from the micro-porosity of both the raw material the wrought material. Sealing is used to guarantee the best pressure-tightness without changing the dimension and surface features. Questa soluzione economica ed affidabile permette di raggiungere le conformità alle specifiche tecniche più esigenti.

We perform two different sealing processes and aour production capacity is over 2.500.000 pieces/year.

Hot methacrylate

Hot sealing

The increasing demand by the Automotive sector pushed Fonderia Cunio to develop strong strategic partnerships, becoming a leader in the sealing sector using methacrylate resin.

Thank to the use of efficient machines and the right resins, as well as competent staff, our production is approved in all the main industrial sectors (automotive, aviation, gas, plumbing, agrifood sector, ecc.)

U.V. Controls

Ultraviolet controls

The impregnation check, carried out only by sample as it is a destructive test, is carried out by breaking the piece in the area where the leak has been identified and subjecting the part to polymerized light. The resin that has penetrated inside the porosity is thus highlighted.

Density controlled sintered aluminum samples can be used that, once broken, allow you to check the penetration of the resin in the various layers.

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Imprex® Munari

Treatment against the micro-porosity of the metals

We use the IMPREX® technology for the sealing treatments, it is a resin that penetrate into the porosity of the material which needs to be treated and after a chemical reaction it turns into an elastic product that can’t be dissolved in water or other solutions. The product reacts with the acidic substances and become immiscible with organic solvents; the storage and preservation must be in canisters made by different materials then copper, aluminum, steel, tin, lead, alloys.

Producer website

3 porosity classes

Nature and extent of the difect

Internal porosities

without consequence but likely to become a bypass while processing.

Superficial porosities

Can cause visual defects (oozing, oxidation, degassing).

Bypass porosities

Among the most serious because they allow infiltration of liquids and gases.

The external aspect of porosities do not allowdetermine the difect nature and value. Sealing is recommended when the production process is ended but before the surface treatment to avoid possible pickling penetration.


Some examples of use

Porous material sealing treatment is done to decrease permeanbility and gain mechanical resistance. The process used by Fonderia Cunio, penetrates the microporosity and clings to the inside and, after a chemical reaction, it turns into an elastic product that can’t be dissolved in water or other solutions like hydraulic fluids, antifreeze, motor oils, petrochemical products, brine, water, steam, etc. After the sealing process the product can be finished without any risk for new sealing level.

Here are some examples:
- Oil-hydraulic pumps and water pumps.
- Taps and fittings
- Gas valves
- Actuators
- Cylinder heads and engine block
- Aluminum radiators

Sealing process

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