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ISO 4892-3

Standard ISO 4892-3 is the third part of ISO 4892; a guideline that describes how samples should be exposed to laboratory light sources.

The test method described in ISO 4892-3 uses fluorescent tubes and is commonly referred to as QUV test. The QUV test shows in a short time the resistance of plastics to weather conditions such as (sun) light and condensation. Therefore, according to 4892, this method of testing is also called artificial rapid weathering.

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In the QUV test according to ISO 4892-3, samples are brought into a test chamber, where they are then illuminated by UV-TL tubes. In most cases, UVA lamps are chosen, and less frequently UVB lamps.

Dry, with water spray or condensation

To simulate reality, ISO 4892-2 gives the option of (periodically) wetting the samples. This can be done using a spray method or by allowing condensation to settle on the test samples in a controlled manner. The quality of the water used must meet strict requirements. For more details see ISO 4892-1.

Various cycles

ISO 4892-3 describes 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 wetting.

Cycle nr.ExposureLamp typeIrradiance (340 nm) W/m2*nmBlack panel temperature (°C)
18h dryUVA-340 (Type A1)0,7660 ± 3
4 h condensationlamps off50 ± 3
28h dryUVA-340 (Type A1)lamps offNot regulated
0,25 h water spraylamps offNot regulated
3,75 h condensationlamps off50 ± 3
35h dryUVA-340 (Type A1)0,8350 ± 3
1 h water spraylamps offNot regulated
4102 min dryUVA-340 (Type A1)0,8370 ± 3
18 min water spraylamps offNot regulated
Method B: artificial rapid heating with UVB 351 lamps
524 h dry (no condensation)UVA-351 (type 1B)0,7650 ± 3
Method C: artificial rapid heating with UVB 313 lamps
68h dryUVB 313 (Type 2)0,4870 ± 3
4 h condensationlamps off50 ± 3

Test duration

ISO 4892-3 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 4892-2: Xenon arc lamps;
  • ISO 4892-4: Open flame carbon-arc lamps

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