zintek® material properties and regulatory standards
zintek® is a high quality Zinc-Copper-Titanium alloy, fully compliant with European standard EN 988 “Zinc and Zinc alloys; requirements for rolled flat products for the construction industry.” This standard outlines the requirements for flat rolled products made of Zinc-Copper-Titanium alloys used in buildings and supplied in the form of coils, sheets or strips.
The alloy must be produced from Z1 quality 99.995 Zinc according to European standard EN 1179, with the addition of alloying elements.
zintek® material standard: UNI EN 988 - composition in %
The alloying components improve the characteristics of the zinc laminate:
• Titanium increases resistance against permanent deformation over the course of time;
• Copper increases the tensile strength of the material.
The combination of the two decreases the expansion coefficient of the alloy.
zintek® material standard: UNI EN 988 - mechanical properties
|Unitary misalignment load from proportionality||0,20%||Rp 0,2||N/mm2||min 100|
|Tensile strength||Rm||N/mm2||min 150|
|Elongation percentage after breaking||A50mm||%||min 35|
|Elongation percentage with sliding||%||max 0,1|
|Minimum hardness||HV 45|
Physical and technological characteristics
|Specific heat at 20||kJ/Kg °C||0,401|
|Thermal conductivity at 20||W/m °K||109|
|Electric conductivity||m/ohm sq. mm||17|
|Thermal expansion coefficient in parallel to the lamination direction||mm/m °C||0,022|
|Thermal expansion coefficient transversal to the lamination direction||mm/m °C||0,017|
|Bending test at 180° 20°C in longitudinal direction||n°||3 minimum|
|Bending test at 180° 20°C in transversal direction||n°||5 minimum|
Calculation of masses
|Nominal thickness mm||Approximate mass Kg/m2|
The rolls of laminate with an inner diameter of 508 mm (with or without cardboard core), protected by waterproof paper, are placed on special wooden pallets, allowing for easy handling until the time of usage.
Sheets and strips
These are cut into perfectly flat sheets on strapped wooden pallets, and are protected by waterproof paper on the upper part and by cardboard on the bottom.
0,60 - 0,65 - 0,70 - 0,80 - 1,00 mm
Different thicknesses can be produced on request.
Between 100 mm and 1,100 mm
Greater or smaller widths can be supplied on request, up to a maximum of 1.150 mm.
For sheets, the standard is 1,000 X 2,000/3,000 mm.
Different measurements must be agreed with the manufacturer.
Coils: varies according to width, up to a maximum weight of 7,000 kg for primary reels.
Sheets: in pallets of 500 - 1000 - 1,500 - 2,000 kg.
Thickness: maximum deviation from the ordered nominal thickness must not exceed +/- 0.03.
Preferential nominal thicknesses: 0.60mm 0.65mm 0.70mm 0.80mm 1.00mm.
Maximum deviation from the ordered nominal width must not exceed 0/+ 2 mm. Minimum nominal widths of 100 mm; maximum 1,100 mm.
Maximum deviation from the ordered nominal length for a sheet or strip must not exceed 0/+10 mm.
Preferential lengths are 2,000 mm and 3,000 mm.
Deviations from straightness must not exceed 1.5 mm/m.
Flatness misalignments must not exceed 2 mm.
At the buyer’s request, at the time of the order the manufacturer must issue a control document pursuant to EN 10204, based on tests for the batch supplied, or statistical quality control measurements, as specified by the buyer.
The designation system requires the product denomination (Zn Ti Cu), the European standard number (EN 988), the required nominal thickness (e.g. 0.70 mm) and the nominal width in mm or nominal length in mm (in the case of sheets).
Unless agreed otherwise, the marking must specify:
• the name of the product;
• the European standard number (EN 988);
• the casting and/or roll number;
• the product name or trademark.
The natural look of zintek® is a glossy grey laminate, smooth and shiny.
When exposed to the weather, the surface covers with a self-protecting layer, which remains stable over time and lends the surface a natural aged look, with a pleasant grey slate appearance.
The oxidation process of zintek® material may change the chromatic coordinates of the surface unevenly, resulting in areas with different shades of grey. This is just a transitional process that will terminate with a pleasant uniform colouring of the entire surface.
The natural appearance of the laminate can be changed with special surface treatments, without altering its corrosion resistance requirements.
Behaviour with exposure to weather and resistance against corrosion
The protective layer that forms when zinc comes into contact with oxygen and water consists of a layer of basic zinc carbonate, which protects the metal. This is the natural protective process of zinc, which ensures the durability of the product over time.
Behaviour with changes in temperature conditions
The laminate is not affected by temperature changes following its processing and installation. Its melting point is around 419° C, with a recrystallization limit of 300° C, an essential factor for brazing.
It is non-combustible and resistant to ultraviolet rays, with no known wind-caused erosions.
Reaction to chemical action
Contact with acids and alkaline substances must be avoided.
Reaction to electrochemical action
When they come into contact with one-another, different metals can sustain damage due to their difference in potential. zintek® laminate should never come into contact with copper and its alloys (brass), whether directly or indirectly, e.g. via rainwater flowing through copper covers or parts to other parts made of zintek® laminate.
|Rural||More than 100 years|
|Industrial urban||60 years|
|Industrial agglomeration||40 years|
|Maritime||Between 40 and 60 years|
Constant and rigorous lab tests allow to monitor the resistance characteristics against corrosion of products deriving from the treatment process.
The tests concerning atmospheric oxidation resistance, conferred by the surface treatment, are carried out in a saline mist chamber, in compliance with standard ASTM B 11, and in a humidity chamber, in compliance with standard ASTM D 2247.
Ecology and the environment
Tests have shown that the transfer of zinc due to flowing rainwater causes no risk to the environment.
Zinc used for covering solutions or other types of construction works is completely recyclable and re-usable in a variety of industries, and maintains a high market value even as scrap metal.
Given its physical and chemical properties, the zintek® material possesses high levels of ductility and malleability, making it suitable for any tinsmithery applications.
The laminate must not be used at a temperature below 10° C. Good practice requires that processing take place only after allowing the temperature of the laminate to cool to the minimum specified value. Concerning works carried out during the winter months, it is advisable to follow best practices and to pre-fabricate the elements in a workshop environment, where the temperature conditions are more favourable. For all processes that need to be performed on-site, a slight pre-heating of the laminate can be performed by using hot air ventilation.
Temperature variations occurring after the processing and installation of the laminate have no influence on the product’s behaviour.
zintek® material has excellent weldability properties, using either traditional methods with a Lead / Tin brazing alloy or more recent TIG or induction techniques.
In cases in which a mechanical joining of zintek® laminate is performed by using screws or nails, the preferred materials are: aluminium, galvanised steel or stainless steel.
Copper and its alloys, such as brass, are not recommended, due to the electrochemical corrosion these materials may cause.
Maintenance and handling
Unlike other materials, zintek® requires no maintenance.
zintek® products must be transported by suitable means only. A dry and ventilated space must be guaranteed for all transport operations. The loading and unloading of vehicles must occur in a dry place and/or under a canopy. Avoid transporting the product on damp, humid pallets. The surface protection should be suited to avoid possible damage.
During the crimping of the pallet, be sure to stand in a stable position, and make sure there is enough space, in order to avoid any damage.
zintek® products must be stored in a dry and well ventilated area. Humidity levels must be checked constantly.
Stocked products must be protected against humidity.
Avoid unprotected outdoor storage. Direct covering of the coils or profiles should be avoided, especially if there are no aerated spaces between one item and the next. It is important to prevent the formation of condensation if the temperature drops below the dew point inside the storage area.
Use and new technologies
zintek® laminate is usable for all types of building products: covering: double seam or different methods.
Façade cladding: usable with different systems. Tinsmithery in general: gutters, pipes, elbows, flashings, etc…
New zintek® surface technology
Believing in the inherent potential of zintek® laminate, the parent company Simar has further expanded its product range with surface-treated laminates, known as pre-coated laminates.
These are innovative products that enjoy the same mechanical properties as natural zintek®, offering colour variations that meet the highest aesthetic requirements.
The development of these products has further strengthened the already excellent corrosion resistance properties of natural zintek®, thanks to the synergy between the company’s modern laboratories and University research centres.
The chemical surface treatment of zintek® laminates allows for a uniform and compact coating that creates a barrier against atmospheric oxidation, providing remarkable durability standards.
The technological process that has been developed excludes the use of harmful polluting elements during the working phase and final installation. This ensures absolute respect for the environment over the course of time.
ZC type laminate for tinsmithery accessories
The “ZC” laminate is especially suitable for any application subjected to significant processing stress. For its production, Zinc SHG 99.995 is used exclusively as a raw material, pursuant to standard EN 1179: 95 Z1, with the addition of suitable alloying. Produced by using special laminating processes, it takes on the physical and mechanical qualities which best respond to the specifications requested by users.
This laminate possesses a high ductility rate, and can therefore be elongated significantly, both parallel and transversal to the rolling direction. It also lends itself well to deep-drawing, even when processed cold; it can be bent by 180 degrees without cracking, and folded without breaking. Furthermore, it welds very easily, using both traditional methods and the latest TIG or induction welding techniques. It is especially suitable for the production of all types of tinsmithery accessories.