Materials

Wood

Thermo-treated ash

Extery harmony and comfort consists of important solutions and this is why Extery has chosen thermo (heat) treated ash wood for its benches . The benefits of thermo-treated ash wood are its durability (class 1), beauty, dimensional stability, environmental friendliness and quality. Ash is environmentally sound alternative to tropical wood. In thermo-wood all the warmth, essence and spirit of the ancient wood have been preserved.It is possible to produce wood, which does not rot or grow mold, and which does not vary in size and is environmentally friendly, only by heat treatment. Heat treatment is the computer controlled process of wood heating which is carried out in a special chamber at a temperature of 190 to 212 ° C, during which process all the moisture, acids and bacteria in the wood are driven out.

Download maintenance sheet for thermo-treated ash wood:
Siperian larch

The most notable property of larch is its stunning resistance to rot. Glued laminated larch twists and cracks remarkably less than solid wood. For centuries, mankind has witnessed the unique performance of structures built from Siberian larch. Their experiences led them to refer to it as the “Wood of Eternity”We use glued laminated larch in our benches collection as larch will retain its qualities without any chemical processing or finishing for decades. It is one of the most durable types of wood in terms of weather conditions, primarily due to its unique gum content.

Tropical wood

Tropical wood is often the preferred outdoor wood material for its quality, durability and stability. In addition to its strength and quality, tropical wood has a very unique appearance. Untreated tropical wood is a fresh delicate pink shade, turning silver-gray over time.

The tropical wood in our selection is always FSC marked.

Metal

Hot-dip galvanized steel

Galvanizing is an anti-corrosion treatment in which the products are covered with a thin layer of zinc. Without any damage the surface will last for many years, keeping the details from rusting. When exposed to the atmosphere, zinc reacts with oxygen to form zinc oxide, which further reacts with water molecules in the air to form zinc hydroxide. Finally zinc hydroxide reacts with carbon dioxide in the atmosphere to yield a thin, impermeable, tenacious and quite insoluble dull gray layer of zinc carbonate which adheres extremely well to the underlying zinc, so protecting it from further corrosion.

Stainless steel

Stainless steel, also known as inox steel differs from carbon steel by the amount of chromium present. Carbon steel rusts when exposed to air and moisture. This iron oxide film (the rust) is active and accelerates corrosion by forming more iron oxide. Stainless steels contain sufficient chromium to form a passive  film of chromium oxide, which prevents further surface corrosion and blocks the corrosion from spreading into the metal’s internal structure.

Anti-graffiti lacquer

To keep powder coated items looking new and attractive and to reduce overall maintenance costs, an additional protection can be applied on their surface. As a side effect, the lacquer will add gloss, so the final color of a product will not be matt even for matt powder coating option. The application of anti-graffiti lacquer is done the same way as regular powder painting. Anti-graffiti lacquer is based on polyurethane chemistry which releases a blocking agent during the curing process. This solution is designed to allow the simple and rapid removal of most forms of graffiti and is recommended for use where resistance to graffiti is required. Typical end uses include train, tram and bus components, bus shelters, telephone boxes, school furniture and play equipment, outdoor park and street furniture, garden furniture, road signs, fencing and public buildings.Cleaning instruction of products covered with Anti- graffiti lacquer

Type
Cleaning Fluid
Enamel Spray
A, C, D
Water-based marker
O
Permanent marker
A, B, C, D, E
Lipstick
O
Shoe polish
O
Key:
A
90% denatured alcohol
B
1:1 mixture of denatured alcohol and detergent
C
Acetone
D
Trichloroethylene
E
Tetrachloroethane
O
Rub with cloth

Elastomer

Elastomer surface

EXTERY has brought to the urban furniture field the material which has been mostly used for industrial application. Two-component, high performance non-aromatic polyurea/polyurethane hybrid spray elastomer system is commonly applied to protect surfaces of intensely used areas like boat decks and van floors.This substance has excellent thermal stability and good chemical resistance, providing extra protection for the metal. It also creates an interesting surface structure that matches designer products perfectly.Metal benches are exceptionally practical for urban spaces, but during the cold season their appeal diminishes. Elastomer surface layer makes metal warmer to sit on while protecting the products against corrosion and graffiti. Elastomer-covered bike racks are more resistant to mechanical damages and also avoid scratching bike’s frame.

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