• GENERAL INFORMATION
• SHAPE - SECTION
• CHARGE MATERIAL - COATINGS

Tytan Trapez T35 Informacje ogólne

At present, double-zinc plated and then varnished steel sheets are used for the production of roofings.
For the best protection against corrosion, the steel is zinc plated with one layer (2). Then, the steel is bathed in water solutions a couple of times - this way a perfect adherence of varnish is obtained (passivation - 3). Then the third layer - priming paint - to additionally increase the anticorrosive protection and adherence of top layer is applied (4). The external varnish coating is the last layer (5). Drying and setting (hardening) of varnish is the last operation.

There are usually five components in the varnish structure:
Binding medium - it makes the varnish into a layer that can be applied onto a sheet and defines on such varnish properties as hardness, resistance to light and temperature. The varnish is named after the binding medium, thus the polyester name means that the polyester is the binding medium.
Pigment - defines the varnish color and its resistance to UV radiation and high temperatures.
Gloss additives - add shine.
Admixtures - decide on the varnish properties [e.g. for plain surfaces - admixture increasing fluidity is added]
Dissolvent - gives the varnish its proper consistence that enables sheet barrel coating.

 

The structure of zinc coated sheet and coated sheet

1- steel sheet
2- zinc coating
3- passivation layer
4- priming lacquer [grounding]
5- decorative lacquer [polyester, pural, pvdf]

 

Types of available protective coatings:

POLYESTER - (gloss 25 µm i matt 35 µm) - for external and internal use ( in normal weather conditions), characteristic of great fastness, flexibility, resistance to scratches and UV radiation.
Application - general building engineering in atmosphere corrosivity environments C1, C2 and C3 acc. to PN-EN ISO 12944-2:2001

Evaluation scale from * to ****

Flexibility	**
Resistance to corrosion	***
Resistance to UV	**

 

PURAL (polyurethane 50 µm) - great resistance to UV and atmospheric factors, great possibilities of forming.
Application - general building engineering in atmosphere corrosivity environments C1, C2 and C3 acc. to PN-EN ISO 12944-2:2001
(available at special request)

Evaluation scale from * to ****

Flexibility	***
Resistance to corrosion	****
Resistance to UV	***

 

PVDF (polyfluorvinyl PVDF 25 µm) - good Resistance to corrosion, great Resistance to UV radiation, great possibilities of forming.
Application - general building engineering in atmosphere corrosivity environments C1, C2 and C3 acc. to PN-EN ISO 12944-2:2001
(available at special request)

Evaluation scale from * to ****

Flexibility	****
Resistance to corrosion	***
Resistance to UV	****

 

ALUZINC (185 g/m² / 25 µm) - metallic coating based on aluminum (55%), zinc (43,4%), silicon (1,6%), with natural resistance to corrosion. Aluminium protects the steel base, separating it from atmosphere. It is an extremely stable barrier because the aluminum oxide that appears on the surface is insoluble in majority of environments guaranteeing a long-term resistance to corrosion - a 20-year-guarantee for perforation that results from corrosion. Zinc has 'healing' abilities of minor scratches and cut spots. The joint effect of both mechanisms of protection guarantees the aluzinc-coated sheets better properties than in the case of steel plates protected only with zinc or aluminum coatings.

 

CYNK (275 g/m²) - has unique protective abilities of places where the steel core has been exposed because of incision or scratches. In practice, it is zinc that corrodes, not steel - the phenomenon is called cathode protection.