Technical File

TECHNICAL FILE OF ROLLED ZINC-TITANIUM ZINTEK® PRODUCTS

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 %

Cu
Ti
Al
Zn
min
min
min
0,080
0,060
resto
max
max
max
1,000
0,200
0,015

Z1 quality zinc

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.

Primary Zinc: UNI EN 1179 Standard
Type
classification
Nominal
Zinc content
1
Pb
max
2
Cd
max
3
Fe
max
4
Sn
max
5
Cu
max
6
Al
max
Total
elements
1 – 6 max
Z1
99,995
0,003
0,003
0,002
0,001
0,001
0,001
0,003
Z2
99,990
0,005
0,005
0,003
0,001
0,002
0,005
Z3
99,950
0,030
0,020
0,020
0,001
0,002
0,050
Z4
99,500
0,450
0,050
0,050
0,500
Z5
98,500
1,400
0,050
0,050
1,500

zintek® material standard: UNI EN 988MECHANICAL PROPERTIES

Mechanical properties:
Unitary misalignment load from proportionality
0,20%
Rp 0,2
N/mm2
min 100
Tensile strength
0,060
resto
resto
Elongation percentage after breaking
max
max
max

Physical and technological characteristics

Description
Measurement unit
Value
Density
Kg/dm3
7,14
Melting point
°C
419
Specific heat at 20
kJ/Kg °C
0,401
Thermal conductivity at 20
W/m°K
109
Electric conductivity
m/ohm mm²
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
Recrystallization limit
°C
>300
Elasticity modulus
N/mm2
>80.000
Erichsen value
mm
7-9
Bending test at 180° 20°C in longitudinal direction
3 minimo
Bending test at 180° 20°C in transversal direction
5 min
Rigidity
%
40-55
Non-magnetic
Non-combustible

Calculation of masses

Nominal thickness mm
Approximate mass Kg/m2
0,60
4,30
0,65
4,70
0,70
5,00
0,80
5,80
1,00
7,20

Lifespan

Environment
Lifespan
Rural
More than 100 years
Industrial urban
60 years
Industrial agglomeration
40 years
Maritime
Between 40 and 60 years

Supply

Coils

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. 

Available thicknesses 
0,60 – 0,65 – 0,70 – 0,80 – 1,00 mm 
Different thicknesses can be produced on request. 

Available widths 
Between 100 mm and 1,100 mm 
Greater or smaller widths can be supplied on request, up to a maximum of 1.150 mm. 

Available lengths 
For sheets, the standard is 1,000 X 2,000/3,000 mm.
Different measurements must be agreed with the manufacturer.

Weight 
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. 

TOLERANCE:

Thickness tolerance
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. 

Width tolerance
Maximum deviation from the ordered nominal width must not exceed 0/+ 2 mm. Minimum nominal widths of 100 mm; maximum 1,100 mm. 

Length tolerance
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. 

Straightness tolerance
Deviations from straightness must not exceed 1.5 mm/m. 

Flatness tolerance
Flatness misalignments must not exceed 2 mm.

 

Control

Control documents
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. 

Designation
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). 

Marking
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.

CE marked zintek® products:

Prod. code Description Standard CE label DOP type Technical specifications
DOP.A01
Natural zintek® in slabs
UNI EN 14783
DOP.A02
Natural zintek® in coils
UNI EN 14783
DOP.A03
Shaped natural zintek® rolled products
UNI EN 14783
DOP.A04
Natural zintek® tinsmithery accessories
UNI EN 14783
DOP.A05
Natural rolled zintek®
UNI EN 14783
DOP.A06
Natural perforated zintek®
UNI EN 14783
DOP.B01
Pre-weathered zintek® in slabs
UNI EN 14783
DOP.B02
Pre-weathered zintek® in coils
UNI EN 14783
DOP.B03
Shaped pre-weathered zintek® rolled products
UNI EN 14783
DOP.B04
Pre-weathered zintek® tinsmithery accessories
UNI EN 14783
DOP.B05
Pre-weathered rolled zintek®
UNI EN 14783
DOP.B06
Pre-weathered perforated zintek®
UNI EN 14783
DOP.C01
The colored ones zintek® in slabs
UNI EN 14783
DOP.C02
The colored ones zintek® in coils
UNI EN 14783
DOP.C03
Shaped The colored ones zintek® rolled products
UNI EN 14783
DOP.C04
The colored ones zintek® tinsmithery accessories
UNI EN 14783
DOP.C05
The colored ones rolled zintek®
UNI EN 14783
DOP.C06
The colored ones perforated zintek®
UNI EN 14783

Surface appearance

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

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.

Corrosion resistance

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.

Workability

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.

Weldability

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.

Ecology and Sustainability

Ecology and the environment
Tests have shown that the transfer of zinc due to flowing rainwater causes no risk to the environment.

Maintenance
Unlike other materials, zintek® requires no maintenance.

Recycling
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.

Transport

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.

Storage

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.

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.