Resistance to UV Rays Standard HD 605 S2-2008

Resistance to UV Rays HD 605 S2-2008 , Test principle and definition of the light source: This test is based on the prolonged exposure of the flat surface of the outer side of the cable test specimens to ultra-violet rays.
 
The light source used should be such that in a dry atmosphere (relative humidity below 30 %) the exposed surfaces of the two flat surfaces of the test specimen, the side corresponding to the outside of the test specimen cable, receives a radiation in which the wavelength-dependent energy distribution complies with the values indicated on the curve (Figure 2.4.23).

 
HD 605 S2-2008
 

To take account of the dispersion of the lamps and their ageing, the following tolerances are accepted, This radiation may be obtained with a xenon lamp fitted with quartz filters.
 

Resistance to UV Rays Standard HD 605 S2-2008 Radiation obtained with a xenon lamp fitted with quartz filters.(Wave length -200nm- 800nm)
1) 20% in the area of UV radiation ( wavelength below 400nm)
2) 50% for the visible radiation ( wavelength above 400nm)
For the dispersion of the lamps and there aging following tolerances are accepted
1) Cycle -1 Humidity ≥85% at temperature 25±2°C for one day with sprinkling of water at a rate lasts 3 min per period 20min.
2) Cycle -2 Exposure for one day in a humid atmosphere at the temperature of 50±2°C with thermal shocks obtained by being put into an enclosure kept at -25±2°C for three one-hour period.
3) Cycle -3 Two days exposure to light radiation in a dry atmosphere at temperature 70±2°C and relative humidity ≥30%.
4) Cycle -4 Exposure of 8 hr with 0.067% in a volume of sulphur dioxide and kept at a temperature 40±3°C with saturated humidity.
The equipment shall be able to cover the following different cycles

 
HD 605 S2-2008
 

1) Exposure for one day to light radiation in a humid atmosphere, (relative humidity more than 85%), at the temperature of (25 ± 2) °C with sprinkling; Resistance to UV Rays Standard  HD 605 S2-2008
2) NOTE: The sprinkling of demineralized water lasts 3 min per period of 20 min; it is done with the aid of injectors in which the water discharge should be sufficient to ensure the washing of all the test specimens.
3) Exposure for one day in a humid atmosphere at the temperature of (50 ± 2). °C with thermal shocks obtained by being out into an enclosure kept at (-25 ± 2). °C for three one-hour periods. The rot-cold or cold-hot transfers should be done in the shortest time possbile.
• The samples shall follow a cycle of 5 days. During these days they shall be subjected to the following tests:
1) Two days exposure to light radiation in a dry atmosphere during which the temperature is kept at (70 ± 2) °C and the relative humidity isless than 30 %;
2) The fifth day, exposure for &Jl_ with 0,067 % in volume of sulphur dioxide and kept at a temperature of (40_± 3) °C with saturating humidity. For the last 16 h the door of the enclosure is left open to the laboratory environment.
• The time the test specimens remain in a humid atmosphere between two thermal shocks should be one hour or more.
1) During the exposures the test-pieces, similar to those defined for the tensile test, shall be placed on supports, taking care that they are not subjected to any tensile force.
2) At the end of the test, the samples shall be removed and kept protected from direct sunlight in the laboratory atmosphere for 24 hour at least. A visual verification shall then be carried out to ensure that there is no significant discolouration between the aged test pieces and those not subjected to the test.
Test Mothod

 
HD 605 S2-2008
 

1) The reference batch shall be kept at ambient temperature avoiding direct sunlight throughout the environmental testing.
2) The other batch shall be subjected to the specified 5 days cycle and then conditioned like the reference batch for 24 h.
• The test requires two batches of six test-pipces; one of them being the reference batch.
Reference batch: Ao and R0; + Exposed batch: A1 and R1. HD 605 S2 • After the visual for any significant discolouration the elongation at break (A. … ) and tensile strength (R…. ) of the test-pieces from each of the batches shall be measured in accordance with EN 60811-1-1, 9.2, i.e. respectively:
Test Pieces

 
HD 605 S2-2008

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