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Perfoplast is a generic name for perforated plastic materials. Many perforations are possible in plastic sheet materials. The most important and most used plastics are HDPE / polyethylene and PP / polypropylene but also PVC. In general the perforations for filters / strainers are mostly round. The smallest diameters that give good perforating results are 2 mm.

Material properties:
Excellent seawater resistance
Durable, smooth, shiny, strong, firm
Chemical resistance
No maintenance required
Good machinability and weldability
10 times lighter than steel
Insulator, not magnetic
Excellent UV resistance
Excellent impact strength

The size of the holes are always indicated in combination with a pattern or stitch. An example of a pattern is the equilateral stitch. This is the most common pattern for filters and strainers. This stitch is designed in an isosceles triangle. The most common is R2T3 or R3T5. The diameter of the holes are 3 mm and the center to center distance is 5 mm.

R = diameter of the hole in mm;

T = stitch or center to center distance in mm.

Table transmittance:

Diameter hole (mm) Stitch/center distance (mm) Permeability (%)
2 3 40,3
2 3,5 29,6
2 4 22,7
3 5 32,6
4 6 40,3
5 8 35,4
6 8 51,0
6 10 22,7
8 10 32,6
8 12 40,3

The perforated plastic sheets have great application possibilities, like water filters. Filters made of Perfoplast have excellent corrosion resistance in seawater. Furthermore it is much lighter and cheaper than steel.

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