IGUs WITH WARM EDGE
SPACER BAR

INSULATED GLASS UNITS

WITH WARM EDGE

Until recently, aluminium spacer bars were widely used in the construction of IGUs. Aluminium is highly conductive and has an exceptionally high thermal energy loss.

With ever-improving window frames and glazing systems and an emphasis on thermal efficiency, the market has seen a huge switch to warm edge technology.

Reducing energy consumption is undoubtedly a must. This switch has resulted in the requirement for windows with increasingly lower thermal transmittance values, Uw [W/m2 K]. The warm edge used today in insulating glass units has played an important part in achieving these objectives.

IGUs WITH WARM EDGE
SPACER BAR

Warm edge

objectives

Warm edge products help to minimize energy loss.
Warm edge spacer bars significantly lower the temperature differential between the centre and edge of the unit and up to 94% reduced heat loss (or heat gain) at the external edge of a window.

IGUs WITH WARM EDGE
SPACER BAR

Warm edge

CRITERIA ACCORDING TO EN ISO 10077-1

Various spacer bars have been used within insulated glass units. Some were more thermally efficient than aluminium spacer bars, however, did not meet the industry criteria. With a major enhancement in the design standards, the below parameters were set in which the spacer bar had to fulfil to be classified as warm edge.

Σ (diλi) ≤ 0,007 W/K

where:

di – thickness of partition material

λi – television of conductivity of material in W/mK

Example: 2(d1λ1) + (d2λ2) ≤ 0,007 W/K

The table below shows how particular types of bars fulfil the revised criteria.

Types of bars Value ∑ (di x λi)

EN ISO 10077-1

 Qualification assessment

of spacer bar as “warm edge”
Aluminium 0,1120 negative
Stainless steel
Chromatech		 0,0052 positive
Chromatech Ultra 0,0026 positive
Termo TGI 0,0020 positive
Swisspacer Advance 0,0019 positive
Swisspacer Ultimate 0,00002 positive
Multitech G 0,00002 positive

Reduce heat loss with

warm edge technology spacer bar

Double glazed windows fitted with warm edge spacer bars have a warmer internal edge temperature of up to 65% which, helps to improve the thermal efficiency of the window and reduce the risk of condensation.

Warm edge technology can help to reduce condensation on your sealed unit by up to 70%. This reduction in moisture almost eliminates the chance of mould growth and potentially harmful bacteria.

Contributing to the environment, heat-saving can help to reduce the heat consumption or air conditioning requirements of a home which in turn lowers carbon emissions and can help save money on fuel bills.

IGUs WITH WARM EDGE
SPACER BAR

Range offered

Standard offer

Type of spacer bar Colour Widths

Thermobar

RAL

grey 7045

black 9005

white 9016

10,12,14,16,18,20
Swisspacer Ultimate RAL

light grey 7035;

black 9005;

 10, 12, 14, 16, 18, 20
Multitech G light grey;

black;

 10, 12, 14, 16, 18, 20

SUMMARY

OF ADVANTAGES

Reduces heat loss

Increased IGU life span

Reduces the risk
of moisture penetration

Rebranding information

On 1st April 2024
Glass Systems was rebranded
as Press Glass.

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