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It is important to reliably know which material will be the best one after
ten years, but this is a long time for performing a test.
One method of comparing, in an accelerated way, the behaviour of
the various materials when exposed to sunlight and moisture is to
employ a xenon test chamber.
This apparatus has a triple function and can measure:
· Light transmission: this refers to light passing through the sheet and
is measured as a percentage. This is the percentage of incident light
minus the reflected and absorbed parts.
· Haze: turbidity and/or degree of crystallisation of the sheet. Light is
diffracted in all directions producing a loss of contrast.
· Clarity (resolution): a high-quality sheet is one that provides a high
definition image of whatever is seen through it.
The tensiometer permits the study and monitoring of the tension to
which the plastic sheet is subject from its spectral colouration.
Our materials are thermoformable, which means they can be heated
using our thermoforming machine in order to make them malleable,
creating a bubble with pressurised air which is then shaped by a mould.
In accordance with UNE-EN 14428
In order to comply with this standard, NUDEC subjects its screen
sheeting to chemical resistance testing and hard impact tests by striking
them with 45 kg sacks (equivalent to the weight of a running child that
collides with the sheeting). The test must be repeated four times on each
side in order to certify its impact strength.
Sheet colouration monitoring is basic. The colorimeter is used to
determine sheet colour through coordinates a (green-red trend),
b (blue-yellow trend) and yellowing index (YI).
Xenon Test Haze-gard Tensiometer Thermoforming Machine Impact Test Colorimeter