Indoor vs. Outdoor

Solar radiation only turns into heat when the radiation is absorbed. Verosol fabrics with the nano-layer of aluminium are highly reflective (up to 85% reflection). This means it reflects 85% of the solar radiation, preventing absorption and allowing the solar radiation to escape back through the window. This means Verosol is very effective as indoor solar shading and is an equivalent alternative for outside solar shading. This has been independently verified through the given equivalency statements.

There are many benefits for indoor solar shading on different levels:

  • The costs of outdoor solar shading are much higher than indoor solar shading
    • Acquisition costs
    • Installation costs
    • Maintenance costs
  • Indoor solar shading does not affect the design of the building facade
  • Indoor solar shading can be used regardless of the wind outside
  • Indoor solar shading, especially when metallised, has additional insulative benefits

If heat is trapped inside, unfortunately you can’t get it out. The trick is to prevent incoming solar energy (light) being transformed into heat by absorption (short wave into long wave radiation). Aluminum reflects the incoming light back through the window BEFORE it can be absorbed and turns into heat. Imagine a mirror outside the window. You can look through glass to the mirror and it reflects back through the same mirror so you can see yourself. Light/energy can be reflected back through glass!

The science behind metallised fabrics

The picture shows the difference between white metallised and white non-metallised fabrics.

Non-metallised white fabric still allows diffuse light to pass through the fibres. The metallised fabric reflects the light and prevents diffuse light passing through. The characteristics of the weave (defining the view-through) are kept intact, creating excellent visual and thermal comfort.

Vacuum metallising works on the same fundamental principles as bathroom mirrors fogging up after a warm shower. Warm vapour condenses and bonds to a cooler surface.

In our metallising chamber, we heat up pure aluminium up to 1400°C in vacuum to create aluminium vapour. The vapour rises in the chamber and condenses on the fibres on one side of the fabric. The benefit of this process is that only individual fibres receive a very thin (several nanometers thick) layer of aluminium and the fabric weave and characteristics remain unchanged.

Coatings are often thicker and as such create heavier and thicker fabrics. Furthermore: the openness of the weave structure can be affected, reducing view through.

No, the yarns are round and therefore create a diffuse reflection to the outside. Only flat reflective layers like mirrors will create these glare reflection (and so do foils!)

Glare issues are determined by the light transmission, NOT by the openness factor. The total light transmission is the combination of the direct/specular light transmission (which is equal to the openness factor) and the diffuse light transmission. The diffuse light transmission is significantly higher and is the reason for glare issues. Therefore the focus should be to reduce the diffuse transmission and not the direct transmission since this will limit your view through. How to reduce the diffuse transmission? Two options:

1. Dark yarns, but these absorb energy and turn it into heat.

2. Covering the yarns with a perfect layer of Verosol aluminum which is non-transparent.

No, because then it will partly lose its reflectivity and Verosol strives for the best possible result.

Emissivity (or E) is the value on a scale from 0 (minimum) to 1 (maximum) that describes the ability of materials to radiate heat (infra-red radiation). Non metallised fabrics have a E value between 0.8 and 0.9, whereas our SilverScreen 2% has a value of 0.03.

Low E means that a material hardly radiates heat and that the material can act as a barrier for the natural heat flow to colder areas. Aluminium has one of the lowest E-values of all materials (gold and silver are the lowest). It acts as an insulator in the same manner as a thermos does. If you fill a thermos with boiling water, you don’t feel this on the outside.

Verosol SilverScreen 2% is the lowest E blind available. With this product:

  • You will prevent drought, meaning no discomfort near windows;
  • The product has better insulating properties than a normal cellular blind;
  • The insulative properties can provide on average 10% savings on your energy bill.


Yes, but be careful with the metallised parts. Cleaning with a soft cloth or even with neutral hand soap is OK. Don’t use aggressive detergents or rub the metallised side too firmly. Be careful with the product. It brings a lot of benefits, but you should take extra care of it. Compare it with a beautiful, expensive suit. Do you put it in your washing machine? No, you bring it to the dry cleaner. Not because of the low quality, but to take extra care of the benefits it will give you.