Manifattura Corti - Italy
What is UV radiation?
UV (ultraviolet) radiation belongs to the electromagnetic spectrum of the sun, the majority of which reaches the surface of the earth, despite the ozone located in the layers above the atmosphere and the magnetic field of the earth. What we frequently call UV radiation is defined as a part of the radiation included between the wavelength of 100 nm and 450 nm, therefore part of the solar radiation located between part of the spectrum represented by X-rays and the visible light, and generally divided up into:
UVA radiation (of a wavelength of 400-315 nm) - UVB radiation (of a wavelength of 315-280 nm) - UVC radiation (of a wavelength of 280-100 nm).
The human organism is the most sensitive to the UVB part of the solar spectrum. Up until a short time ago, we believed that UVA radiation (close to the part visible to the spectrum) did not have any huge influence on the organism, but recent studies indicate that it causes accelerated ageing of the organism (photo ageing). The UVC part of the spectrum, close to the X radiation is, fortunately, absorbed completely in the atmosphere. The systematic observations carried out for more than 30 years show a constant increase in the intensity of UVA and UVB radiation, caused especially by the loss of the ozonesphere. The reduction in the ozonesphere is decreasing, but it is not yet sure if we have reached the minimum value. In any case, we live in a period of the minimum value of the ozonesphere and the maximum of UV radiation, ever since measurings of this kind have existed.
The influence of UV radiation on man – the reaction of the organism
Intense exposure to the Sun and frequent outdoor exposure were considered until a short time ago as “a healthy way of living”. However today, with the facts and results of research, we are forced to radically change our attitudes to Sun exposure. Even if a moderate exposure to the sun has pleasant effects because it stimulates synthesis of vitamin D in the organism, it helps our bones and acts on some forms of skin diseases (psoriasis), the skin exposed to sun radiation changes and is damaged just after 10 to 30 minutes. The process itself of tanning, as a natural protection against sun radiation, is not fast enough to obstruct the damages and, finally, does not have enough protection for the organism. A skin that is completely tanned and brown has a protection factor of between 2 and 4.
Die Norm UNI EN 13758-1 UV / 2007 – Eigenschaften des UV-Sonnenschutzes
In 2007 the member countries of the European Union, taking into consideration the results of existing research, approved the norm related to the protection factors against UV radiations n° EN 13758-1.
Up until approval of the norm, apart from rare standards and national recommendations, almost every manufacturer of fabrics, as well as those of sun creams had their own index system that was not compatible with the others and only led to confusion. The sold UPF protection factor (ultraviolet protection factor) is currently being introduced to define the level of protection as a factor of time that each person can spend in the sun without the risk of sun burn. This means that, protected by an awning with a UPF 50 protection factor, unlike unprotected skin, we can spend 50 times more the amount of time in the sun.
UV protection fabrics, composition and weave - Methods of protection
Protecting ourselves against UV radiations means recognising the problem and avoiding exposure to the sun as much as possible. It is best to avoid exposure to the sun in the summer months between 11 o'clock in the morning and four o'clock in the afternoon. The UV protection fabrics are characterised by a high level of protection, therefore a low level of permeability of UV radiations (the fabrics that we produce for your awning obstruct the passage of UV radiations by more than 85% up to more than 99%. )
Characteristics of your kind of skin Reaction of unprotected skin
to 30 min. of exposure
Protection time of
skin in minutes
Protection in minutes with the sun blind
Pale skin, freckles blond or red hair,
blue or green eyes
Always burnt, Never tanned 5 - 10 Multiply the UPF value by the
protection time of the skin
Pale skin, blond hair, blue or green eyes Always burnt, light tan 10 - 20
Dark skin, dark hair, blue eyes Light burning, good tan 20 - 30
Dark skin, dark or black hair, brown eyes No burning, Always tanned ca. 45
Dark skin, dark hair, dark eyes No burning ca. 60
UV Protection - UPF Protection Factor

The pleasure of living outdoors without the harmful UV rays is now
made available thru our collection of awning fabrics,protecting
you from 85% to almost 100% of harmful UV rays.

 from 12 to 13 protection 85% - 90%
from 14 to 39 protection 90% - 95%
 from 39 to 50 protection 95% - 99%
>50 protection >99%
UV (UPF) values calculated according to the norm UNI EN 13758-1 : 2007
Solar light protection - Factor of Solar protection
Our awning collection also provides protection from solar light
(see solar chart for the percentage of solar light protection).
 Grey light trasmission <10%
 Blue light trasmission >10% <20%
 Red light trasmission >20% <30%
Values of the solar protection according to the norm UNI EN 410:2000
Solar Protection - Solar protection Factor
Protecting you from the harmful UV ray and limiting heat
circulation our outstanding collection provides
solar protection factorfor various colors:
 Grey limits the passage of the heat more than 90%
 Blue limits the passage of the heat between 80% and 90%
 Red limits the passage of the heat between 70% and 80%
Values of solar light protection according to the norm UNI EN 410 : 2000
These values of solar protection factor are set according to the norm UNI EN 410:2000
External solar screens
 The norm UNI EN 13363-1 2004 defines the method of calculation for relations between recorded energy and the energy transmitted within a glass wall protected by an awning. Some examples of protection related to unprotected glass walls and glass walls protected by an awning, follow:
Unprotected window
Protection determined by glass only
Plain insulating glass 4/12/4: g=0.76
Protection equivalent to 24%
Protected window
Protection determined by the glass + external awning with our fabric colour 468
Plain insulating glass 4/12/4: g=0.76
Energy transmitted and absorbed by the fabric : t
e=6,2% ae=71,6%
The combination of glass + fabric generates a g tot
e : 12%
This value highlights that the energy transmitted internally is limited to approximately 12% of the recorded energy.
Thermal wellness UNI EN 14501:2006
NAccording to the norm UNI EN 14501:2006 app. A, the performance of a solar screen can be classified into 4 classes according to the total g value. The following table highlights the efficiency of protection determined by the combined glass – solar protection (awning) screen.
Class 1 2 3 4
g tote 0,35<g tot<0,50 0,15<g tot<0,35 0,10<g tot<0,15 g tot<0,10
Judgement moderate good very good excellent