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ISO 4892-2

Standard ISO 4892-2 is the second part of ISO 4892; a guideline that describes how samples should be exposed to laboratory light sources.

The test method as described in ISO 4892-2 is the so-called xenon test, also known as weatherometer or lightfastness test. The xenon test quickly shows the resistance of plastics to weather conditions such as (sun) light and rain. Therefore, according to 4892-2, this method of testing is also called artificial rapid weathering.

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Direct sunlight or filtered (behind glass)?

In the Xenon test according to ISO 4892-2 (also called light fastness test or weatherometer test), samples are placed in a test chamber, where they are then illuminated by a xenon Arc lamp. This light is filtered in such a way that only the light that is practically applicable to the product is allowed through. The most important filter types are the so-called daylight filters and windowglass filters.

Daylight filters illuminate the product with a spectrum that is very similar to the sunlight spectrum. Window glass filters provide a light spectrum that corresponds to sunlight that has passed a standard window. This means that UV light, which causes most damage to plastics, does not reach the samples.

Dry, with water spray or dipping

To simulate reality, ISO 4892-2 gives the option of (periodically) benating the samples. This can be done using a spray method or immersion in water. The quality of the water used should meet strict requirements. For more details see ISO 4892-1.

Relative humidity

Because humidity plays a role in the aging of plastics under the influence of light, the xenon test according to ISO 4892-2 can be performed with or without controlled relative humidity. Performance with controlled humidity requires a different type of apparatus. At M2LAB, we have several rapid aging chambers with and without humidity control.

Various cycles

ISO 4892-2 describes in one of its chapters different test cycles that can be applied. Cycles can consist of several phases. These phases can vary in terms of time duration, temperature, irradiation and humidity.

Cyclus nr.ExposureIrradianceBlack standard temperature (°C)Room temperature (°C)Relative humidity (%)
(300 to 400 nm) W/m2(340 nm) W/m2*nm
A1102 min dry60 ± 20,51 ± 265 ± 338 ± 350 ± 10
18 min water spray60 ± 20,51 ± 2
B1102 min dry60 ± 20,51 ± 265 ± 3not regulatednot regulated
18 min water spray60 ± 20,51 ± 2
Exposition with window filters (window glass)
A2Continuously dry50 ± 21,1 ± 0,0265 ± 338 ± 350 ± 10
A3Continuously dry50 ± 21,1 ± 0,02100 ± 365 ± 320 ± 10
B2Continuously dry50 ± 21,1 ± 0,0265 ± 3not regulatednot regulated
B3Continuously dry50 ± 21,1 ± 0,02100 ± 3not regulatednot regulated

Test duration

ISO 4892-2 does not specify how long to test, or the correlation between the number of hours of xenon testing and real-life exposure.

Other parts of the ISO 4892 standard are:

  • ISO 4892-1: General description of the guideline;
  • ISO 4892-3: Fluorescent lamps (QUV test);
  • ISO 4892-4: Open flame carbon-arc lamps.

Want to have your product tested according to the ISO 4892-2 standard?