Typical modern buildings are often covered with plenty of glass windows. It affords a beautiful view of the external facade and provides an impression of space to the occupants.

The catch is a comfortable, natural environment is never a constant: Seasons come and go! In Singapore and hot countries, seasons go from wet to dry, and is either warm or warmer only. In temperate countries, such as in Europe, summer heat and winter cold, both will alternately affect our living space.

You’ll probably be thinking … “so what”?

Well … the sun warms us up in several ways. Simply, the manner our working space heats up is due to the insulation and thermal capability of the ventilation, roof, opaque walls and windows. For rooms, it is measured as the Envelope Thermal Transfer Value (ETTV). Each building’s ETTV thermal performance is affected by:

  • Heat conduction through opaque walls
  • Heat conduction through glass windows
  • Solar radiation through glass windows

In buildings with a large percentage of glass coverage, window heat shield protection is critical to ensuring comfort and energy efficiency.

Why so?

The formula (for our technically interested readers):

The ETTV formula is given as follows:

ETTV 12(1−WWR)Uw 3.4(WWR)Uf 211(WWR)(CF)(SC)


ETTV : envelope thermal transfer value (W/m2)
WWR : window-to-wall ratio (fenestration area / gross area of exterior wall)
Uw : thermal transmittance of opaque wall (W/m2 K)
Uf : thermal transmittance of fenestration (W/m2 K)
CF : correction factor for solar heat gain through fenestration
SC : shading coefficients of fenestration

Note: (CF) x (SC) => Solar Heat Gain Coefficient (SHGC)

Solar Heat Gain Coefficient (SHGC) is the net heating that affects your room space. The lower the unit number, the better is the heat shielding.

Effectively, solar radiation through windows is the reason why a modern glass building gets heated up much faster than traditional stone buildings. You may getting confused now … how then does Ezzoshield come into play?


Firstly, you have to understand the characteristics of solar radiation? Solar radiation consist of 3 main components:

Ultra-Violet (UV): Component in the solar spectrum, which may cause harm to living beings, and causes colour in materials such as fabrics and print to fade. It is only 5-6% of the total range.

Visual Light Transmittance (VLT): Natural light component in the solar spectrum. It is 51-52% of the total range.

Infrared (IR): In the sun’s radiated heat, IR consists mostly of the Near IR spectrum. This is different from living or material radiated heat such as from electric heaters and humans. Human beings radiate IR wavelengths measured > 1500nm. Near IR (IR from the sun) is less than 1500nm and consist of 43% of the entire solar spectrum.

So you may think that how does this link to Ezzoshield?

Ezzoshield is made from rare earth tin oxide materials with high thermal conductivity and visual light transmittance properties. Its nanotechnology effectively reduces Near IR by up to 95% or approx. 55% of net solar heat is prevented from affecting your living space. This is based upon the SHGC of 0.45. Ezzoshield has been tested by TUV SUD PSB Singapore to ISO 9050-2003, ASTM C1371- 2004a and NFRC 100:2001. It has also been tested by SGS Taiwan for Substance of Very High Concern (SVHC) for chemicals of material concern. This testing is for approval exporting to the European market.

There are two models:

EZZS PRO – Hot countries such as Singapore. PRO is effective in reducing Near IR up to 95% in actual conditions, while maintaining high % of natural light to shine through.

EZZS ADVance – Temperate countries. ADVance is effective is eliminating Near IR up to 75-80% while allowing an even higher % of natural light to shine through.