Sealing
what is sealing?
The surfaces of aluminium alloys and anodizing layers are sealed with the aid of a dipping varnish. Very even layers are created, even on complex components with internal surfaces such as drill holes or cavities. Sealing the surface increases corrosion resistance and significantly increases alkali resistance. It is biocompatible (according to the standards DIN EN ISO 10993-1:2010, DIN EN ISO 10993-5:2009 und DIN EN ISO 10993-12:2012) and food safe according to FDA regulations (according to FDA, CFR Title 21 §175.300).
SILA-COAT® 5000
SILA-COAT® 5000 is a high-performance clear coat applied to the surfaces of aluminum alloys with the aim of sealing them. SILA-COAT® 5000 is created in a three-step process:
- Pre-treatment tailored to the respective aluminum material
- Conversion treatment
- Sealing by means of electrophoretic dip coating
SILA-COAT® 5000 increases the surface’s resistance to corrosion, while significantly enhancing its alkali resistance. The dip coating’s regular network structure seals and levels the surface.
properties
Our aluminum surface treatment creates very even layers, also on complex components with interior surfaces, such as drillings or cavities. SILA-COAT® 5000 is biocompatible (according to the standards DIN EN ISO 10993-1:2010, DIN EN ISO 10993-5:2009 und DIN EN ISO 10993-12:2012) and safe for use with food according to the FDA regulations (according to FDA, CFR Title 21 §175.300). This type of coating results in good resistance to chemicals and corrosion.
The process can be varied by the application of different interlayers, which also define the color of the coating. A conversion layer creates a golden surface, whereas interlayers created with HART-COAT® hard anodizing and technical anodizing change the color impression towards a metallic gray and black.
The advantages of SILA-COAT® 5000 at a glance:
- Extremely high resistance to alkalis
- High corrosion protection
- Surface leveling
- High dielectric strength
- Good UV resistance
- Safe for use with food according to the FDA regulations (according to FDA, CFR Title 21 §175.300)
- No cytotoxicity according to ISO 10 993-5 (biocompatibility)
- Even layer structure
- Dip coating thickness: 25 µm ±5 µm
base materials
Our SILA-COAT® 5000 process creates surface coatings for aluminum parts, such as wrought and cast aluminum alloys. Upon request, we will be happy to check the coatability of other base materials.
fields of use
Good dielectric strength and high corrosion resistance make SILA-COAT® 5000 interesting when it comes to electrical components. When applied to such components, this coating solution prevents the formation of oxide layers. SILA-COAT® 5000 anodic dip coating (also referred to as ADC) can also be used whenever aluminum components need to be cleaned with alkaline media. Concrete fields of use include food processing, packaging plants, laboratories, medical technology and gastronomy. Dip coating can be used to apply even and smooth layers to component areas which are difficult to access (e.g. cavities or drillings). Where required, an anodized interlayer should be applied as well.
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frequently asked questions - sealing
SILA-COAT® 5000 increases the corrosion resistance of aluminum components, while clearly enhancing their dielectric strength. The surfaces are leveled so that it is also possible to deposit even layers in cavities and drillings.
The mere SILA-COAT® 5000 layer is transparent. It is the application of an interlayer that determines the final color. A conversion layer creates a golden surface, whereas interlayers created with technical anodizing and HART-COAT® hard anodizing change the color impression towards a metallic gray and black.
Yes, the process can be combined, for example, with interlayers created with anodizing or electroless nickel plating.
process locations
Any questions? Contact us directly or select a process location near you.
