UV Weathering and Related Test Methods - Cabot Corporation
UV Weathering and Related Test Methods - Cabot Corporation UV Weathering and Related Test Methods - Cabot Corporation
4 Radiation components UV radiation represents only 4.6% of the solar spectrum, but causes the most important damage to the polymeric materials. The complete solar UV spectrum ranges between 280 and 400 nanometers, but the most aggressive part is the UVB range with very short wavelengths between 280 and 315 nanometers. visible light 45% UV 5% Radiation energy: definitions The irradiation is the radiation energy incident over a specific area for a given period of time. It is expressed either in W*s /m 2 , Joule/m 2 or very often in Langley (Ly). 1 Ly = 1 cal/cm2 = 4.184 E 4 Joule/m 2 infrared 50% Example : what is the total irradiation for a 3-year outdoor exposure in Belgium? ➢ annual sunlight radiation in Belgium : 80 kLy (see table below) ➢ total irradiation after 3 years : 80 x 3 = 240 kLy The global annual sunlight radiation level (kLy/year) for various countries is given in the table below. It corresponds to the radiation energy that can be transmitted to a plastic part in one year of continuous outdoor exposure. Note: values in this table are only indicative. Within certain (larger) countries, radiation levels can vary significantly from one area to another.
Average solar radiation per country in kLy (kcal/cm 2 /year) COUNTRY kLy Austria 80 Afghanistan 180 Alaska 70 Algeria 160 Angola 120 Argentina 160 Australia 180 Bahamas 140 Bahrain 200 Belgium 80 Burma 120 Bolivia 140 Brazil 120 Bulgaria 100 Canada 100 Chad 200 Chile 140 China 140 Columbia 100 Costa Rica 140 Cuba 140 Cyprus 140 Denmark 70 Egypt 200 Ecuador 120 El Salvador 140 Ethiopia 140 Finland 70 France 120 COUNTRY kLy Germany 80 Great Britain 70 Greece 120 Guatemala 140 Guyana 120 Haiti 160 Hong Kong 140 Honduras 140 Hungary 80 India 180 Indonesia 140 Iraq 180 Iran 180 Israel 180 Italy 120 Jamaica 160 Japan 100 Jordan 180 Kenya 140 Kuwait 180 Korea 120 Lebanon 180 Luxembourg 80 Libya 180 Madagascar 140 Mali 200 Malta 160 Malaysia 140 COUNTRY kLy Morocco 160 Mauritania 180 Mexico 160 Mozambique 160 Nepal 160 Netherlands 80 Nicaragua 140 Niger 200 Norway 70 New Zealand 120 Oman 160 Pakistan 180 Panama 40 Paraguay 160 Peru 140 Philippines 140 Poland 80 Portugal 40 Rumania 100 Russia (North) 70 Russia (South) 140 Sardinia 20 Saudi Arabia 200 Senegal 180 Sicily 140 Singapore 140 South Africa 160 Spain 140 Sudan 220 COUNTRY kLy Suriname 120 Sweden 70 Switzerland 80 Taiwan 140 Thailand 140 Tunisia 160 Turkey 140 Uruguay 160 USA North 100 Arizona 180 Florida 140 Uganda 140 Vietnam 140 Venezuela 160 Zambia 180 5
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- Page 3: Introduction to Weathering Long ter
- Page 7 and 8: Absorption Coefficient (Kilo Abs. U
- Page 9 and 10: Artificial weathering chambers a) Q
- Page 11 and 12: The Xenon arc weathering chambers h
4<br />
Radiation components<br />
<strong>UV</strong> radiation represents only 4.6% of the solar spectrum, but causes<br />
the most important damage to the polymeric materials. The complete<br />
solar <strong>UV</strong> spectrum ranges between 280 <strong>and</strong> 400 nanometers, but the<br />
most aggressive part is the <strong>UV</strong>B range with very short wavelengths<br />
between 280 <strong>and</strong> 315 nanometers.<br />
visible light<br />
45%<br />
<strong>UV</strong><br />
5%<br />
Radiation energy: definitions<br />
The irradiation is the radiation energy incident over a specific area<br />
for a given period of time. It is expressed either in W*s /m 2 , Joule/m 2<br />
or very often in Langley (Ly).<br />
1 Ly = 1 cal/cm2 = 4.184 E 4 Joule/m 2<br />
infrared<br />
50%<br />
Example : what is the total irradiation for a 3-year outdoor exposure<br />
in Belgium?<br />
➢ annual sunlight radiation in Belgium : 80 kLy (see table below)<br />
➢ total irradiation after 3 years : 80 x 3 = 240 kLy<br />
The global annual sunlight radiation level (kLy/year) for various<br />
countries is given in the table below. It corresponds to the radiation<br />
energy that can be transmitted to a plastic part in one year of<br />
continuous outdoor exposure.<br />
Note: values in this table are only indicative. Within certain (larger)<br />
countries, radiation levels can vary significantly from one area<br />
to another.
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