Solar radiation

The sun produces an enormous volume of energy (66 million W/m2) which is transmitted towards the Earth. On a clear day, part of this energy will reach the Earth, which is up to is 1000 W/m2.

To determine which type of solar protection system is the most suitable for installation in a building, the following source of solar radiation must be taken into consideration:

Type of radiation

Type of radiation
Direct radiation
Radiation which has been neither absorbed nor reflected by the Earth’s atmosphere.
Diffuse radiation
Radiation which has been absorbed by the atmosphere and emitted in all directions.
Reflected radiation
Radiation which has been reflected from the ground from direct and diffuse radiation.

Solar Transmission

Solar Transmission
Ts (transmission of solar radiation)
Quantifies the volume of radiation which passes through a fabric. A low percentage indicates a reduction of solar energy by the fabric.
Rs (reflection of solar radiation)
Quantifies the volume of radiation reflected by a fabric. A high percentage indicates a reduction of solar energy by the fabric.
As (absorption of solar radiation)
Quantifies the volume of radiation absorbed by a fabric. A low percentage indicates a reduction of solar energy by the fabric.
Fabric optical and thermal properties

Solar protection is defined as the combination of systems which are used to control the volume of light and energy from the sun in a building. Controlling solar  light  and  energy  benefits energy  savings  in terms of:

  • Reducing  the  amount  of  energy  needed  for  heating  or cooling the inside of the building.
  • Reducing  the  amount  of  energy  needed  for lighting,  by optimising natural light.
  • Reducing CO2 emissions (and reduces the impact caused by the building’s carbon footprint).

In the same way, this visual and thermal control favours comfort inside the building, providing and boosting the productivity of those inside.

Visual / Optical Comfort

Natural light has a significant and positive influence on people’s health. When people are inside a building where there is adaptive control of daylight, their performance is boosted. To determine the visual comfort offered by acrylic canvases, the ratings as defined by the EN14500 standard, and are used with the regard to:

Glare control

Which has the capacity of the canvas to control the level of lighting to reduce light contrasts.

Use of daylight

Which the capacity to reduce the period during which artificial lighting is required and to make optimal use of the available daylight.


Clasificación Confort Visual Optico

Thermal comfort

People are thermally comfortable when they do not feel hot or cold, that is, when the temperature, humidity and air currents are favourable to the activity being performed. When these activities are taking place indoors, this comfort comes from the structure of the building and the openings to the outdoors (through windows and glass doors). It is for this reason that solar protection systems perform efficiently to control environmental temperatures indoors.
To determine the thermal comfort offered by acrylic canvases, the ratings as defined by the EN14500 standard , and are used with the regard to following:

Factor solar (Gtot)

The relationship between the solar energy which impacts on the out-side of a window and the total energy which is transmitted to the inside of a room.


Clasificación Confort Termico

Common effects of an acrylic solar protection canvas

Fabrics have been technically and aesthetically designed under strict quality control procedures to meet the needs of our customers in terms of solar protection, increased privacy and energy savings.
Once a canvas has been manufactured for installation, certain visual imperfections may appear; these cannot be considered as product defects. These imperfections do not produce any reduction in the inherent properties of the canvas, in terms of its resistance, water repellence or solar protection.
The most common effects are:

Some marks can be seen when the canvas is backlit; these are caused by the handling of the canvas during manufacture and installation, as well as to the folds performed as part of the manufacturing process. These marks are more visible in lighter colours.

Cleaning and maintenance instructions

We recommend cleaning your Docril® fabric with a soft-bristled brush, and rinsing with water. For localised stains, clean with a neutral detergent mixed in lukewarm water (maximum 38 ºC / 100 ºF) and rinse with water.
When used in awnings, it is very important to allow the fabric to dry completely before folding it. Should it be necessary to fold the awning while the fabric is still damp, it can be dried with air (under no circumstances should hot air be used), although the fabric dries out very quickly thanks to its technical characteristics.
Our fabrics can be dry ironed (below 66 ºC / 150 ºF) using the synthetics setting. Do not steam iron.
As it is not possible to explain how to deal with every possible type of stain in this document, please contact us at info@citel.es if you need further instructions or help and we will be more than happy to assist you.

Interior fabrics properties


The fire retardant property of their core material, allow the textiles to pass all fire retardant standards in different countries and hotel chains.


CITELCONTRACT® INTERIORS fabrics meet the necessary technical criterial for each recommended use, in terms of rub resistance, pull resistance, pilling, UV resistance and colour fastness.


Our contract collections are designed to meet the aesthetic and decorative needs of top quality city and resort hotels.

Polyester FR or Trevira

The CITELCONTRACT® collection provides exclusive selections of fire retardant fabrics especially designed for the needs of hotels and businesses. Complying with safety and aesthetic requirements, the textiles have been manufactured to make curtains, sheers, blackout screens, bed plaids and furniture upholstery.

POLYESTER FIRE RETARDANT: inherent fire retardant yarn.
CITELCONTRACT® INTERIORS textiles are made with fire retardant polyester fibres. These fibres provide a permanent fire retardant property to the fabrics, unlike textiles treated superficially as part of the finishing process. This inherent fire retardance guarantee long term safety.
This subtle but fundamental difference is contained in the chemical structure of the polyester fibre. A compound of organic phosphorus with fire retardant properties is firmly bound to the fibre as a comonomer.
The fibres that have been subjected to fire retardant treatment during the finishing process can lose protection through wear and tear, age or frequent washing. The fibres and, therefore, the fabrics of CITELCONTRACT® INTERIORS, on the other hand, are intrinsically fire retardant.