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Technical details
Tips and tricks for DIYers

Technical details


Technical conditions and recommendations

Dear Customer.

These Technical Specifications are based on our experience in supplying perforated materials. Please read them carefully as they may help you understand some of the important details when selecting a particular material and when using it correctly.

A customer ordering a predefined design is considered to have knowledge of the use of these products. If you are unclear, please contact us.

All advice and recommendations provided herein or in consultation with us (“Recommendations”) are based on our experience and operating conditions or those of some of our customers. These Recommendations are provided as general information only and should not be considered exhaustive or complete.

We are not responsible for the accuracy of the Recommendations if they are made under operating conditions other than those on which the Recommendations are based. We are also not responsible for any damage resulting from implementing the Recommendations in an incorrect manner or by an insufficiently qualified person.

When deciding whether to apply the Recommendations, we recommend that you assess the specific operating conditions and evaluate whether our Recommendations are suitable for your situation. Always consult a professional if you have any doubts about the accuracy or completeness of our Recommendations.

Do you need help with anything?
Write us: shop@perfolinea.cz

Perforated sheets

Expanded metal

  • Expanded metal is manufactured in accordance with DIN 791.
  • The tolerances for external dimensions are in accordance with the above standard and the dimensional standards for metallurgical materials EN10025, EN10029, EN10051, EN10131, EN10088.
    • Width tolerance + 20 mm / -10 mm
    • Length tolerance + 100 mm / - 0 mm
    Sheets are cut to order with a tolerance of ±3 mm up to a thickness of sheets 2 mm. Sheets made from sheet thickness greater than 2 mm are cut with a tolerance of ±5 mm. If you have other requirements, please specify them in the order or provide a drawing with dimensions.
Technical recommendation:
  • Expanded metal made from pre-galvanized sheets has untreated inner cut edges of the holes. Such expanded metal cannot be used outdoors or in other oxidizing environments without further surface finish.
  • Steel expanded metal sheets with galvanic zinc surface protection are also not suitable to be used outdoors or in other oxidizing environments. It is necessary to apply a second coat of paint or clear varnish.
  • Surface protection of steel sheets with a single layer of baked powder paint is not suitable to be used outdoors or in other oxidizing environments. Pre-treatment by galvanizing, cataphoresis or the use of expanded metal made of galvanized sheet metal is necessary.
  • Hot-dip galvanizing is the longest lasting protection. It can be performed on expanded metal with holes larger than 8 mm and with sheet thicknesses of 1 mm or more. The smallest opening suitable for galvanizing is for example TR 22 × 12 mm, TR 28 × 10 mm, TQ 20 × 15 mm and larger. This finish is purely for the protection of steel expanded metal sheets. It cannot be considered a decorative element. White rust, which is caused by oxidation of zinc surfaces, is not a defect of the product. Partially sealed holes, various irregularities and blanks resulting from galvanizing are not a defect of the product.
  • During the production of expanded metal, the compound tools produce small protrusions that appear on each opening. If ceiling panels or other decorative elements are to be produced from expanded metal that will not be further coated, please specify this requirement in the enquiry or order. These are especially stainless steel and aluminium expanded metal sheets.
  • Expanded metal can be bent into ceiling panels and other shapes. Unfortunately, the shape and size of the opening makes the bend move to the point of least resistance. Bending tolerances can therefore be up to ±5 mm. If more precise dimensions are required, we will make a sample and measure the actual values.

Floor gratings and stair treads

  • The production of grates is in accordance with DIN 24 537, the production of stair treads with DIN 24 531. Dimensional tolerances are according to RAL-GZ 638.
  • Gratings and treads are mostly made of S235 structural steel (also available in stainless steel 1.4301/1.4571, aluminium and Corten steel, etc.).
Technical recommendations:
  • Surface finish of structural steel products:
  • No surface finish (raw) – surface corrosion may occur – if clean steel is required, this must be specified in the order!
  • Hot-dip galvanizing – the most used finish type – very good corrosion protection. It cannot be considered as a design, it is only a protection against material degradation – minor irregularities, patterns, blanks or white rust is not a defect of the product).
  • Surface finish of stainless steel products:
  • No surface finish (natural) – such gratings are suitable for further processing by the customer (e.g. further welding, cutting) – it is assumed that the final surface finish will be made by the customer after all welding and ironworking procedures have been completed (brown patches on welds, cut/ground edges will sooner or later start to turn black!).
  • Pickling – final product – restoration of the anti-corrosion layer, uniform matt surface.
  • Electropolishing – design and highly chemically resistant – uniform glossy surface.

 

Welded mesh screens and fencing

Welded mesh screens and fencing offer a wide range of applications. They are suitable for the production of transport pallets, machine guard fencing, partition walls in locker rooms, interior decoration, property fencing, animal cages and aviaries.

Welded mesh screens

  • Stock positions of welded mesh screens are made of smooth, raw wire, steel grade 11.
  • Standard stock formats are 2000 × 1000 mm and 3000 × 1500 mm.
  • Welded mesh screens have loose ends, i.e. overlaps.
  • Welded mesh screen spacing is measured from the mesh centres.
  • Tolerances for stock positions of welded mesh screens are ±3mm
  • Welded mesh screens can be welded into frames or inserted into our special edging sections “WE30-3”, gap width 3 mm; steel DD11-DD14/S235; format 1.5 × 30 × 30 × 3100 mm.
  • Welded mesh screens can be made in other designs and formats than standard stock positions. This includes, for example, custom manufacturing in stainless steel or galvanized wire.
  • In the case of welded mesh screens made of galvanized wire, the surface layer of the wire is disturbed due to the production technology. The same service life as in case of hot-dip galvanizing cannot be expected. The surface of galvanized wire cannot be considered as a final finish, but is only used as a base for further surface finish. Welded galvanized wire mesh screens are not suitable for more design-intensive applications – they are not used as a “visual element”. The surface of galvanized wire mesh screens can be grey, oxidized, have white patterns, etc. There are brownish weld patches at the crossing points.
  • Uneven layers of zinc may form when hot-dip galvanizing welded mesh screens. The corners can be socketed, have so-called blanks, etc. The surface of hot-dip galvanized mesh screens may be grey, oxidized, have white patterns, etc., which is not a defect. They are not suitable for more design-intensive application – they are not a visual element. Hot dipped zinc is not a visual finish and serves only as corrosion protection; white rust is not a defect.
  • Hot-dip galvanizing quality is according to DIN EN ISO 1461.
  • Stainless steel welded mesh screens are made of stainless steel with no finish (natural). They are matt and there are brownish weld patches at the crossing points.
  • Tolerances for custom-made welded mesh screens are flexible. That is, according to production possibilities.
  • Welded mesh screens are not “supervised”. This means that they are not subjected to technical tests, as they are only semi-finished products intended for further processing by the customer. 

Fencing

  • Fencing types: crimped mesh and pressure-locked mesh.
  • Mesh opening sizes are measured in terms of clearance.
  • Fencing is made of steel wire, material grade 11, galvanized wire or stainless steel. This is a custom production only; it is not a stock assortment.
  • In the case of fencing made of galvanized wire the surface layer of the wire is disturbed due to the production technology (crimping). The surface of galvanized wire cannot be considered as a final finish, but is only a base for further surface finish. Galvanized fencing is not suitable for more design-intensive applications, it is not used as a so-called “visual element”. The surface of galvanized wire fencing can be grey, oxidized, have white patterns, etc.
  • Hot-dip galvanizing is unsuitable for fencing because high temperatures cause deformation.
  • Tolerances for fencing are flexible, i.e. according to production possibilities.
  • Fencing is not supervised. This means that it is not subjected to technical tests, it is only semi-finished products intended for further processing.

Dear DIYer, we are pleased that you are using our products. We have some basic advice for you to help you with the implementation of your projects.

It is a good idea to make sure you know what you want to use the product for before you start.
An ideal decision for your project is to use the dimensions of already manufactured products. Low-quantity custom production is much more expensive than products in stock that were manufactured in the quantity of a hundred or a thousand pieces.

Is your project for the exterior or interior? What is its purpose? Protection of property, safety, design or something else?

Think about the finish: will you only protect the material from corrosion or do you want it to look good?

We can deliver our products made of any material as far as custom production is concerned. Their basic advantages (or disadvantages) are:

Steel
  • Most affordable, a wide range of application
  • Suitable for welding
  • Corrodes, surface requires treatment
  • Excellent resistance to corrosion + maintenance free when combined with hot dip galvanization. Zinc is applied after the sheet has been cut to the final dimension to avoid any disruption of its layer
Galvanized
  • Steel material, hot dip galvanized by the manufacturer of the metallurgical material that has been worked
  • Cutting edges are not galvanized
  • Not suitable for exterior applications, corrodes
  • Suitable for coating or HVAC
Aluminium
  • Interesting in terms of the low weight; both structure and price-wise.
  • Higher resistance to corrosion but oxidises in time
  • Softer – easier processing but higher risk of damage
  • Ideal where no mechanical damage can be caused
Stainless
  • High resistance to corrosion
  • Suitable for welding
  • Must be dipped/chemically treated to slow down corrosion when used outdoors
  • Premium look, available surface finish such as grinding, brushing, polishing etc.
Corten
  • A unique look thanks to the surface corrosion
  • Clear varnish recommended to avoid rust from trickling down from the surface in wet conditions.

Our products can also be manufactured in other material such as brass, copper, or even plastic to a limited extent (prior consultation required).

The products on the e-shop are sold in sheets, profiles in rods, special products in rolls. Pay attention to the description of the individual items. Custom production is available for atypical formats. Leftover pieces are not available for sale.
We deliver products in natural look, without surface finish.

Perforated sheets
  • Delivered in sheets, the most common formats include 1,000×2,000 mm, 1,250×2,500 mm, 1,500×3,000 mm. Atypical formats available on request.
  • The holes and spacing are stated in millimetres; spacing is measured along axis, from the centre to the centre of the holes in the same row.
  • Bridge = solid sheet between the holes is derivable from the difference between the spacing and the hole.
  • The stock position is cut ‘across the holes’ - the cutting edge is not smooth/solid sheet.
  • Sheet thickness suitable for hot dip galvanization starts at 1.5 mm
  • The minimum hole for hot dip galvanization has a diameter of 10 mm and an equivalent to the shape, otherwise the hole will get sealed
Expanded metal
  • Delivered in sheets and smaller thickness in rolls. The most common formats include 1,000×2,000 mm, 1,250×2,500 mm, decorative expan ded metal also in the format of 1,500×2,000 mm / 2,000×1,500 mm. Atypical formats available on request.
  • Four dimensions are required for expanded metal: mesh length, mesh width, bridge width and material thickness. The mesh length and width are measured along axis – do not measure the internal dimension but the axial one!
  • The mesh length is always parallel with the first sheet dimension!
  • The minimum expanded metal suitable for hot dip galvanization is a diamond mesh of 22×12 mm and equivalent; we recommend larger.
  • When doing hot dip galvanization, it is recommended to do expanded metal and frames/structures separately; otherwise, the structure/expanded metal may be deformed
The most common surface finishes for perforated sheets and expanded metal:
  • Powder coating in RAL shades
  • Hot dip galvanization
  • Zinc plating
  • Dipping stainless sheets for the exterior
Grating:
  • Custom grating is not much more expensive than grating in stock.
  • We manufacture grating starting at one piece
  • We offer steel and stainless grating
  • We manufacture almost any dimension with high precision
  • The grating load capacity is not only determined by the carrying strip, but also by the clear distance of supports.
  • The grating is self-supporting and primarily designed for walking. We also offer road grating.
  • The most common carrying strips are 30×2 mm (grating height of 30 mm) and mesh 33×33 mm for pressed grating / 34×38 mm for welded grating. Expanded metal grating has a mesh of 47×18 mm, 47×13 mm and 62×15 mm.
  • The grating is suitable both for the exterior and interior.
  • We offer pressed, welded and expanded metal grating.
    • Pressed
      •  Higher variability of production options (grating dimensions, mesh type, non-slip finish)
    • Welded
      • Suitable for subsequent finish during installation thanks to welding the individual filling wires into the carrying strips during the production of the grating.
      • Stock items are sold at low price
    • Expanded metal
      • Original look. Suitable for platforms on slopes.
  • Steel grating in the stock is crude or hot dip galvanized. Stainless grating is delivered crude, dipped and polished. Grating can also be delivered treated with thermoplastic powder paint = rubberised.