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HIARC

Colour coated productsfor steel facades


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HIARC


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The use of coated steel forthe facades of buildings

The use of metals in the facades for buildings has rapidly become more

popular. Products have been developed for architectural and constructional

purposes and they provide ever more possibilities in the design of

surfaces and shapes. The advantages offered by metal products can

be used to advantage in the increasingly versatile, durable

and impressive architectural exterior constructions of buildings.

Steel is the most generally used of the metallic facade materials. The

reasons for the increase in use are:

Steel facade products are light in comparison to their strength and

are at the same time dimensionally accurate and flat.

Steel can be formed into the required shape and forming as an

industrial technique is easily controllable.

Steel, as a material, is economical and the use of industrial

manufacturing processes makes final products very cost effective.

Steel is not dimensionally affected by moisture, it is impervious to

water and its thermal expansion is the smallest of all the metals.

Correctly chosen corrosion protection gives steel facades very long

lifetimes (over 50 years).

Steel is very suitable for coating, using both the more conventional andthe metallic and pearlescent colours favoured by modern architecture.

The range of colours and coating types available is very large.

Facade products manufactured from steel are always coated. Industrial

painting which takes place during manufacture and application of

corrosion protection is essentially more economical, technically better

and superior in quality compared to site painting. Coated facade products

provide a very wide and suitable basis for architecture.


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HIARC

Steels used in facade productsand corrosion protection

The choice of materials used in steel or coated

steel facade products is made by the manufacturer.

When determining the steel the manufacturing

technique, product standards and any other

relevant building regulations or instructions are

taken into account. The thickness of materials

used in products is usually determined by the

above but also the dimensions of the products

and the actual climatic conditions affect the

material thickness. The Rautaruukki steel sheets

used in facade products are manufactured to the

standards EN 10142 and EN 10147. The steel

to be used and its thickness are usually specified

by the building product manufacturer.

Formable steels (EN 10142)

Rautaruukki Standard

RAGAL 51 F Z DX51D+Z





Structural steels (EN 10147)

Rautaruukki Standard

RAGAL 220 S Z S220GD+Z







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Hot dip zinc coating is used for corrosion protection

in accordance with the building regulations and

instructions. Zinc provides cathodic protection for

the sheet against corrosion and combined with

colour coating forms a so-called Duplex coating,

which under normal corrosion conditions gives

a very long service life. Colour coated steels

are manufactured in accordance with standard

EN 10169.

Zinc provides the steel with good cathodic

protection, which also applies to the cut edges.


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PVDF facade coating

100%

10 20 300

Gloss retention

Polyester

Plastisol

PVDF

10

10 20 300

Colour change

Plas

tisol

Poly

ester

PVDF

Effect of outdoor exposure on surface appearance

PVDF 13 years Polyester 13 years Plastisol 5 years

The facade presents the building from the outside.

The more important the building the more demanding

are the requirements on architecture of the facade.

The same demands are imposed upon the materials

used. They must fulfil the requirements placed

upon them until the end of their life cycle set out

in the design of the structure.

The best coating for sheet steels used in facades

for buildings is PVDF. The properties of this material

best meet the requirements, for durability and good

appearance imposed upon a facade for the decades

ahead. On the basis of over 30 years experience

and wide scale tests it has been found that PVDF

best meets the requirements for durability of

appearance imposed on building facades. In practice

this means excellent colour and gloss retention

and a surface which remains clean. Its permitted

forming and ambient temperature conditions and

good chemical resistance and cleaning properties

give in addition the best basis for product

manufacture as well as very long lifetime as facades

for buildings. In short, PVDF is by far the most

durable of all the coatings available.

In shade

Sunlight 45

facing south


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40 m

27 m

55 m

60 m

27 m

Coatings recommended for different conditions

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PVDF

Normal colour coating

Recommended for applications under normalcorrosion conditions

Suitable for all steel facade products

PVDF HB

Thicker than normal colour coating

Recommended for applications in severe

corrosion conditions such as marine orindustrial climates


PVDF HB + L

Thicker than normal colour coating + clear lacquer

Recommended for applications in very severe

corrosion conditions such as tropical or sub-

tropical areas and difficult industrial climates Suitable for all steel facade products

PVDF METALLIC

Metallic, normal thickness colour

coating (PVDF METALLIC HB and PVDF

METALLIC HB + L are also available)

Recommended for applications in which

metallic appearance is desired


PVDF HIARC

Pearlescent multicolour coating

Recommended for the facades of large,

architecturally spectacular buildings



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Colours and choosing of colours

Rautaruukki manufactures PVDF coated productssuitable for building facades in three clearly

separate colour series.

STANDARD PVDF COLOURS

Normal gloss, standard colour series for metal

surfaces. Includes grey colour series which ranges

from white to black and a selection of colour shades

based on all other standard colours, for use in

metallic coatings for the exteriors of buildings.

L

100

90

80

70

60

50

40

30

20

10

0

White

Black

a +a

+b

bBlue

Yellow

RedGreen

L

+100

+80

+60

+40

+20

20

40

60

80

100

20406080100 +100+80+60+40+20

+b

b

a +a

Colour and saturation: a - b scale Brightness: L-scale


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PVDF METALLIC

These coatings contain metallic pigments which

strongly reflect light and give the coloured surface

a lustrous, metallic appearance. Change in the

angle of reflection of the light striking the surface

causes a large change in the lightness of colour.

The more the angle of viewing of the surface

deviates from the directly reflected light the deeper

the colour shade. The metallic series contains a

selection of shining metallic colours suitable for

use in building products.

LightDirect reflection

110

7545 25

15

Multiangle colour measurement

RR40

RR41

R

R45

RR4

6

110

75

45

25

15

L

Lightness


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PVDF Hiarc

Hiarc pearlescent multicolour is a new multi-layer-

technique based colour coat series to meet the

requirements of modern architecture. This coatingis different from the normal metallic colour. It is

colour change type. The colour seen by the eye

is affected by the angle of reflection of the light,

which, as it changes, brings out the different

colours and shining effect of the various layers.

Of the colour layers the topmost is semi-transparent

and contains pearlescent pigments. The formation

of two or more colours in the same coating is

based on the ratio of light reflected from the lower

colour layer and that from pearlescent pigments

in the upper layer. The more the light is reflected

by the pearlescent layer the more it obtains its

colour from this layer only.

Structure of PVDF Hiarc

This coating is approximately twice as thick as

the normal PVDF coating. The long-term lifetime

of the coating is in a class of its own compared

to that of the conventional coatings. Colour andgloss retention, dirth pick-up and corrosion

resistance of this new coating are all excellent.


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HIARC


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Coating properties

Coating thickness, m

Gloss, Gardner 60

Max. ambient temperature, C

Min. permitted temperature, C

Min. forming temperature, C

Min. permitted bending radius

Corrosion resistance

PVDF

27

35

110

50

10

1 t

good

PVDF HB

40

35

110

50

10

1 t

very good

PVDF HB + L

55

35

110

50

10

0 t

excellent

PVDF METALLIC

27

30

110

50

10

1 t

good

PVDF HIARC

60

35

110

50

10

0 t

excellent


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Colours

PVDF STANDARD COLOURS

RR 20. WHITE

RR 21. LIGHT GREY

RR 22. GREY

RR 23. DARK GREYRR 33. BLACK

RR 24. LIGHT YELLOW

RR 26. YELLOW

RR 750. TILE RED

RR 29. RED

RR 30. LIGHT BROWN

RR 31. BROWN

RR 32. DARK BROWN

RR 34. LIGHT BLUE

RR 35. BLUERR 36. LIGHT GREEN

RR 11. SPRUCE GREEN

PVDF METALLIC

RR 40. SILVER

RR 41. DARK SILVER

RR 42. GOLD

RR 43. COPPERRR 44. METALLIC BLUE

RR 45. METALLIC GRAPHITE

RR 46. METALLIC BLACK

PVDF HIARC

RR 80. WHITE / BLUE

RR 81. WHITE / GOLD

RR 82. LIGHT GREY / GOLD

RR 83. LIGHT GREY / BLUERR 84. LIGHT BLUE / GOLD

RR 85. LIGHT BLUE / BLUE

RR 86. LIGHT GREEN / BLUE

RR 87. YELLOW / BLUE

RR 88. DARK GREY / GOLD

RR 89. BLUE / GOLD

RR 90. RED / BLUE

RR 91. RED / BRONZE

RR 92. BLUE / BRONZE

RR 93. DARK GREY / BLUERR 94. BLUE / COPPER

RR 95. BLACK / COPPER


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FIN-13300 Hmeenlinna

FINLAND

Tel. +358 3 52 860

Fax +358 3 528 5355

www.rautaruukki.com

PrintedinfinlandbyKOT

EVAOYTURKU

2003

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