- The OROPLUS products offered are classified and governed in accordance with regulation UNI EN 13206:2017. See the corresponding TDS relative to the product supplied.
- The identification of the CLASS of a film is obtained with the W.O.M. test (ISO 4892-2:2013) which allows for accelerated testing of the resistance to photodegradation with specific lights. For a specific constant type of radiation, the result is expressed in hours of resistance according to that specified in point 6, table 2 of the aforementioned regulation.
The relative classes of the films are currently subdivided with respect to the W.O.M. test as follows:
RELATIVE CLASS N° of hours of exposure
(narrowband – 420 nm)
after which the film is at 50% of its original resistance
CLASS N 400 CLASS A 2000 CLASS B 3500 CLASS C 5400 CLASS D 6800 CLASS E 8500 CLASS F 10700
All internal durability tests are performed with 0,51W/(m2-nm) lamps.
The results are comparable to the data shown in this table as per the Regulations.
- The kLy/Year (kilo Langley/Year) is an international unit used to measure global solar radiation or insolation of a determined area over one year.
- When the area in question is subject to exposure for less than 365 days per year, in order to determine the kLy value for a solar year it is necessary to refer to the regulation UNI EN 13206:2017, with particular reference to appendix G, point:
- G.1.3.2 Definition of a Season
- All the results regarding parameters of duration are conditioned, as per regulation UNI EN 13206:2017, appendix G, by points:
- G.1.3.3 Abnormal climate conditions
- G.1.3.5 Products and treatments for the protection of crops
The parameters for the theoretical duration of materials exposed are established as per regulation UNI EN 13206:2017, and are calculated as below:
The theoretical duration of the films with respect to the area of installation with exposure 365 days per year can be determined through empirical correlation:
- Verify the values of solar radiation expressed in kLy/Year indicated for the area subject to coverage
(E.g.: Sicily 160 kLy/Year)
- Define the desired theoretical duration in years
(E.g.: 3 years)
- Multiply the kLy/Year value for the number of years forecast
(E.g. Sicily = 160 kLy/Year x 3 years = 480 kLy)
- Find the result on the X axis and check the corresponding result on line Z to see which CLASS of film is necessary in order to obtain the desired result.
(E.g. Sicily = Considering that a CLASS E film has a resistance of 8500 hours as per W.O.M., it can be deduced that for a guaranteed duration of 3 years, a CLASS F film is recommended, as it has a minimum value of 10,700 hours as per W.O.M.).
In the same way, having defined the technical specifications of a film according to the standard TDS provided (in particular the CLASS), it is easy to identify the theoretical lifespan of the film in years according to the forecast exposure times (either continuous or seasonal) and the consequential kLy/Year according to the relative climatic zone.
The quality of material which will be provided in the event that premature degradation is confirmed is governed by Regulation UNI EN 13206:2017, appendix G, point:
- G.1.3.4 Duration of film for greenhouse coverings