Godfrey & Wing Technology
Godfrey & Wing vacuum impregnation is performed using the new 95-1000AA high performance thermoset sealant, designed to seal porosity in cast and powdered metal components.
The new 95-1000AA has been specifically formulated to provide high heat resistance in a cost effective blend of quality monomers, whilst ensuring safe and environmentally friendly handling of the sealant and rinse water. It is easily washable from the surface of components and is completely removed with tap or deionised water.
Once cured, the cured resins exhibit superior chemical resistance and high temperature stability. Components can be tested or assembled immediately after impregnation as 95-1000AA cures in the presence of heat (heat transfer) to form a durable thermoset polymer.
Applications
95-1000AA is designed with a low viscosity, allowing it to rapidly and effectively penetrate the microporosity of metals and plastics along with other cast and pressed alloys. It can also be used to seal composites, carbon and graphite. Applications include power transmission, hydraulics, fuel delivery systems, pneumatics, automotive and heavy duty transportation. 95-1000AA is inherently stable and resistant to most chemicals.
Chemical-Physical Characteristics
Chemical Type: Methacrylate Blend.
Liquid Appearance: Fluorescent Amber.
Viscosity: 10 cps or mPas a 22° C (72° F).
Density: 1,030 gm/cc a 22° C (72° F).
Surface Tension: 32,8 dyn/cm or mN/m.
Flash Point: >110 °F (>230 °C).
Vapor Pressure: <1 mmHg.
Hardness: Shore D 70.
Density: 1,17 gm/cc 22 °C (72 °F).
Coefficient of Thermal Expansion: 4,3 x 10 -⁴ in/in/°C.
Compressive Strength: 8467 psi.
Modulus of Compression: 13880 psi.
Operating Temperature °C (°F): da -40 °C a 207 °C (da -40 °F a 450 °F).
Imprex® Munari
The treatment of microporosity carried out with the Munari system has the purpose of decreasing the permeability and increasing the mechanical resistance of the treated pieces. Formulated based on polysiloxanes and sodium salts of polysilicon acid, the IMPREX® product penetrates the porosity and then, through chemical reaction, converts into an elastic product, insoluble in water, or in other solvents, anchoring itself to the walls of the porosity of the impregnated material, through interfacial chemical reactions.
Applications
The Munari System impregnation process is aimed first of all at solving the problems of porosity that are created during castings. The technological process and market needs have in fact induced designers to create increasingly complex shapes and to use increasingly lighter alloys. All this has led to the impossibility of avoiding the porosity of the castings and the need to find a process that would allow the recovery of defective elements. With the anti-porosity treatment, recovery is possible. It is therefore possible to “save” castings that are too porous, damaged or elements in which one wants to preventively increase the homogeneity, or the seal and quality (for example, electrical windings).
Chemical-Physical Characteristics
Appearance: Dense, odorless, oily, almost clear green liquid. Stable for an indefinite period if stored in a closed container.
Miscibility in water: in all ratios.
Solid content: approximately 470 g/l.
pH: 10,8 - 12 t.q. solution
Boiling point: 102°C - 104°C.
Viscosity at 20°C: approximately 200 - 400 mPa X s.
Operating temperature range: -60°C +700°C after impregnation..
Pressure resistance: Up to the breaking of the treated support.
Carbonization temperature: does not burn, is inert, inorganic.
Thermal expansion: 2,76x10 (raised to the -4)/°C.
Resists all solvents, hydraulic fluids, antifreezes, engine oils, petrochemical products, brine, water, steam, etc.
The support can be worked after 48 hours from the impregnation treatment without any problem for the seal of the same. The impregnating material, after hardening, has a low thermal conductivity.
UV Controls
The impregnation check, performed only on a sample basis as it is a destructive test, is carried out by breaking the piece in the area where the leak was identified and subjecting the part to polymerized light. This highlights the resin that has penetrated into the porosity.
Sintered aluminum samples with controlled density can be used which, once broken, allow the penetration of the resin into the various layers to be verified.