Metallic Surfaces

Lasierend, Transparent, 
transluzent, kratzfest

Metallic Surfaces - Sol-Gel Hybrid Systems

Since 2005, we have been developing, formulating and producing functionalised special coating systems for metallic & mineral surfaces.
Another focus of our development work is the special coatings with antimicrobial effect on metal surfaces, mineral and plastic surfaces.

Hybrid network - Graphic

Sol-gel network with corrosion protection particles
and functionalised, hydrophobic surface.

1. Water drop


2. Functionality for exc.: Hydrophobia


3. Hybrid network


4. Metallic surface

Hybrid Network - Photo

Functionalised easy-to-clean coating
on a steel soot filter.

Inorganic - organofunctional sol-gel hybrid systems for metal surfaces

Aluminium 3003
Cr-free pre-treatment
3 µm sol-gel hybrid system
Coil Coating
60 sec curing at 260 °C


> 1000 h acid spray test
No delamination at the scratch
Easy-to-clean effect

– High-performance thin layer coatings
– Transparent, glazing or coloured covering
– Reliable corrosion protection at low film thicknesses
– Short curing time (coil coatable)
– Functionalised surfaces
– High coverage
– Easy-to-clean effect
– Heavy metal free
– Very high UV resistance
– Solutions for primer and topcoat applications
– Smooth levelling

Advantages of InterLotus coating systems

Coating thickness comparison
Enlarged illustration x 300.000

Chemical bond to the Substrate
> No Delamination



2-Inorganic-organofunctionally modified Sol-gel-hybrid network

3-Covalent bond

4-Metal substrate

Metallic surfaces

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Scratch after scratch

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High transparency & High temperature resistance at 300°C

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Aluminium 1 kg scratch test

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Transparent & translucent colour / Scratch resistant settings


Interlotus aluminium coatings are preferred by industrial manufacturers and users on coil coating lines. They offer multiple advantages for a finished and high-quality aluminium surface.


– High transparency
– Glazing
– Anti-fingerprint
– Easy-to-clean
– Scratch resistance

Further advantages of the Interlotus
aluminium coatings:


– High temperature resistance
– Self-cleaning
– Non-stick
– Antimicrobial
– Coil coatable

Solar parabolic mirror

Stainless steel in various qualities is “quite soft” and very sensitive to scratches and is therefor foiled before further processing. Usually plastic foils are used. At the end user, the foil has to be removed and the sensitive surface comes into operation.


Therefore, stainless steel surfaces should already be protected before foiling. Interlotus products protect against scratches, facilitate cleaning with an easy-to-clean effect and prevent unsightly fingerprints with an anti-fingerprint effect. If required, the stainless steel coating can be equipped with an antimicrobial effect.


Anti-fingerprint & easy-to-clean properties
Both properties create hygienic advantages in
clinically demanding situations.

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Stainless steel - clean cut edges with oak recess

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Stainless steel - scratch test left uncoated right coated

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Stainless steel coated - Easy-to-clean Soot filter inside view

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Stainless steel uncoated Soot filter inside view

Coating on stainless steel - Bedpan coated (right picture) Bedpan uncoated (left picture)
Stainless steel - anti-fingerprint

Advantages of Interlotus
coatings on stainless steel:



Hot-dip galvanised and electro-galvanised steel have more or less medium to good corrosion protection, depending on the zinc protection layer. For sophisticated and long-life surfaces, we suggest our additional ultra-thin, paintable conversion coatings. These are coil coating products that can significantly improve corrosion protection and sliding properties with very thin layers ≤ 1 µm.


Interlotus products for galvanised steel have the following properties:


– Applicable conversion coating
– Various corrosion protection classes from temporary to 1000 h NSS
– Corrosion protection at S ≤ 10 µm, 1000 h NSS
– Primer function
– Anti-fingerprint
– Improvement of sliding properties during further processing
– Customer-specific colours / colour settings


With these products, we create thin-film added value that contributes positively to production improvement, durability and environmental protection.

Interlotus Produkt – Konversil®

Uncoated sheet
after 48 hours in the
salt spray test

Coated sheet
after 200 hours in the salt spray test Coating less than < 1µm
Interlotus Konversil®

Galvanized can
Galvanised coils
Galvanised coils

Untreated black steel gets red rust very quickly. Depending on the requirement profile, Interlotus can offer you a temporary corrosion 


Wires for steel cables
Fence / Barbed Wire
Steel wire on spools
Steel coils
Steel coils
Steel pipe - temporary corrosion protection

The aim of temporary corrosion protection is to achieve a sufficient corrosion protection effect on the components during the production process, storage and transport.

Steel filter / soot filter
Steel filter / soot filter
Steel pipe - temporary
corrosion protection
Steel pipe - temporary corrosion protection
Steel pipe - temporary
corrosion protection
Steel pipe - temporary corrosion protection

Zinc surfaces are known for their natural long-term resistance. They pass through the natural process of ageing, Patina education with slight optical changes. In order to create these natural processes in an artificially controlled process, technically complex conversion layers or phosphating’s are applied to the zinc material. These protective layers are in turn sensitive to mechanical damage and corrosion.


Therefore, Interlotus has developed thin-layer, long-lasting corrosion protection coatings especially for phosphated surfaces. We have also developed coil-coating paints for various applications on bright rolled zinc surfaces with extreme long-term corrosion protection (NSST > 2.000 h).

InterLotus HPC Color – Bright Rolled Zinc

InterLotus HPC – High Performance Coating can be applied directly onto bright rolled zinc sheet. The coating process is environmentally friendly and saves resources. The phosphatisation can be eliminated. You save costs, time and material

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InterLotus HPC Color - variable Colour settings

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Zinc - anti-fingerprint for phosphated surfaces

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Zinc sheet with easy-to-clean & Dirt-repellent effect.

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Zinc - Corrosion Protection HPC PP - High Performance Coating for phosphated surfaces

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InterLotus Zinc Color

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InterLotus HPC Color NSST > 2400 h

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Excelent finishing parameters Cross cut

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InterLotus HPC Colour / Primer / Bright Rolled Zinc / Brushed Zinc

Test methods / Quality assurance

Test Methods – Cross Cut / Erichsen Deepening / T-Bend Test

The adhesion, delamination and flexibility of Interlotus coatings are tested with all test methods. In the T-bend test, we test the flexibility and adhesion of the coating. All Interlotus Coating relevant test methods are performed in our own in-house Technical Centre & Laboratory.

Clean cut edges with 
Erichsen Deepening
Clean cut edges with Erichsen Deepening
T-Bend Test
grid cut
T-Bend Test
grid cut after tape removal under the microscope
Outdoor weathering summer
weathering summer
Salt spray test
Salt spray test
Outdoor weathering
Outdoor weathering winter
Salt spray test
Salt spray test
Scratch test
Scratch test
Drying test
Drying test

Laboratory & Testing

Interlotus “High Performance Coatings” are individually developed and formulated in our own laboratory. This is how our nano-modified hybrid systems are created.

Scratch test, T-bend test

Tests in the pilot plant & laboratory, dispersion tests, color measurements, laboratory passivation, scratch resistance.