Munari System is the impregnation treatment that solves porosity problems generated during the casting of different materials (aluminium, brass), increasing their mechanical strength.

Technological process and market requirements prompted our company to create an innovative prototype plant with washing and centrifuge systems to guarantee clean holes and surfaces.

Our process, the first in Italy to operate with a fully automatic system, with no labour, allows Munari to impregnate machined parts, maintaining high standards of quality and cleanliness.

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Work phases
1 / Load

Load the processing baskets using dedicated tools


  • integrity of the machined surfaces (scoring, stamping
  • easier removal of excess Munari Imprex product from blind holes, threads and surfaces during washing.
2 / Impregnation

Impregnation with Munari Imprex product

VACUUM: – 0,94 Bar


3 / Centrifuge

• After impregnation cycle
• After washing tanks


  • remove excess Munari Imprex product and contaminated water
  • better drying of the parts treated
4 / Washing

Washing with cold/hot water with air blowing


  • cleaning of threaded holes, including small ones
  • unstained surfaces – unaltered colour of metal

Management system

The system, driven by a state-of-the-art Siemens PLC, from a 4.0 perspective, is incorporated into the management system, allowing step-by-step control of every phase and the recording of process and bath control data.

Product characteristics
Viscosity from 200 to 400 mpa
Allowing the recovery of medium/macro porosity, which cannot be recovered by other systems with lower viscosity resins
Temperature operating range
Resistant to all solvents, hydraulic fluids, antifreeze, engine oils, petrochemicals, brine, water, steam, etc.
Solvent resistance
-60° +700°
The part can be machined after the impregnation treatment without any problems in terms of sealing.
Thermal expansion
2.76×10-4/degrees centigrade. Please note that even if the impregnating material has a different expansion coefficient from the impregnated material, there is no gap between the two thanks to the high elasticity of the former, which always remains well anchored to the walls of the substrate.

Control Plan

The product characteristics are monitored and kept under control by means of the daily viscosity/density test.

Areas of application


Engine crankcases, headers, pump bodies, gearboxes, filter bodies, etc.


Hydraulic valves, gate valves, gas valves, fire valves, oil system valves, etc.


Washbasin groups, thermostatic groups, bath, bidet, sink groups and turned blanks

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