Organic coated sheets

Characteristics of the material

Metallised steel sheets treated by organic coating. This coating is applied on rollers (a coater) and then dried by heat. The top side is covered by a removable protective polyethylene film.

Types of surfaces

The following list shows the most common plastic layers used in façade metal systems. Table of the most frequently used materials and their properties Polyester (SP 25 μm – MYRIALAC, SP 35 μm – MYRIAMAT)

• • Good shaping
• • Good weather resistance

Polyamide-modified polyurethane paint (PU 50 μm – MYRIAMAX)
 

• • Very good forming
• • Very good weather resistance
• • High colour stability
• • The material is particularly suitable for outdoor use
• • It can be exposed to temperatures up to 110°C

Processability

Shaping

Organic coated sheets can be formed by standard processes such as shaping on rollers, bending, bordering, rounding or deep drawing. The shaping can be facilitated by:
 

• • thin zinc coating
• • larger shaping radii
• • slower shaping process
• • higher processing temperatures

Shaping of thin coating is usually impossible without cracks. However, years of studies have shown that cracks in the bent edges pose no problems if their maximum length is 2 mm and the maximum width is 0.2 mm.

Cutting

The sheets can usually be cut, punched and perforated as thin non-coated sheets. Only sharp knives should be used and the cutting slit should be 5 to 6% of the steel core thickness. Using angle grinders is completely inappropriate. The material heats excessively, thus damaging the painted and galvanised layer and eroding the structure of the steel core. The sheet is then not protected against corrosion in the cutting area.

Joining

It is possible to use standard mechanical methods such as farmer screws, rivets, pressure joining, etc. We recommend screws protected against corrosion and plastic washers.

Repairs

Damage in a small area can be repaired by suitable synthetic paints.