Energy Saving Glazing

Energy Saving Glazing

Energy saving is becoming increasingly important and is one of the most intensely debated topics of our time. Energy saving glazing solutions can be achieved through the combination of energy efficient glass and frames.

Energy efficient glass is coated with a low-emissivity substance to reflect radiant infrared energy, encouraging radiant heat to remain on the same side of the glass from which it originated, while letting visible light pass.

Thermally insulating glass, also known as low-emissivity or low-E glass, usually forms the inner pane of an Insulating Glass Unit [IGU]. The glass has a transparent metallic coating that reflects heat from the interior heat sources back into the interior space, rather than allowing it to escape through the glazing. At the same time it allows free heat energy, known as passive solar heat gain, and light to pass through the glass, warming the space and further contributing to the energy efficiency of the glazing.

Due to its neutrality and very high thermal performance, low-emissivity glass is ideal for both commercial and residential applications where the highest level of thermal insulation is required while still using a double glazed unit. 


  • Very high energy efficiency
  • Ug-value of 1.0 W/m²K in a std IGU
  • Neutral appearance
  • High light transmittance
  • Medium light reflectance
  • Combinations for additional benefits
  • Wide range of sizes and thicknesses
Product Advantages

To provide the best in Energy Saving Glazing, we utilise the dynamic performance of the SGG PLANITHERMrange in combination with high performance Aluminium framing systems.

SGG PLANITHERM is a low-E glass offering the lowest centre pane U-value in the market thus providing excellent thermal insulation for the most demanding of glazing specifications.

The transparent low-emissivity coating of the SGG PLANITHERM range of products has been specially developed for use in Insulating Glass Units. The thin magnetron sputtered coating, applied off-line gives the SGG PLANITHERM products their high to very high thermal insulation performance as well as their neutrality.

SGG PLANITHERM excels within the energy saving glazing field by means of an optimised low-emissivity coating. The coating provides an incredibly low Ug-value of 1.0 within a double glazed unit, thereby contributing significantly to energy savings. Carbon Dioxide (CO2) output is significantly reduced, helping to protect the environment, whilst the significant energy savings it offers help to reduce heating costs.

This new low-emissivity product helps to reduce energy losses and hence heating costs. It also increases interior comfort by reducing draughts in window areas, ensuring even heat distribution throughout the room.

Despite its low Ug-value, this product still offers outstanding performance in terms of light transmission and colour neutrality. SGG PLANITHERM is the ultimate in thermal insulation for Insulating Glass Units and should be specified for any situation where excessive heat loss is a concern.

Combination options:

Monolithic Glass:
Standard thickness: 4mm and 6mm
Substrate: SGG PLANILUX clear float

Toughened Glass:
Unique in the market, SGG PLANITHERM ONE II can be toughened to meet the safety glazing performance requirements of BS EN 12150. This product has the same aesthetics as annealed SGG PLANITHERM ONE.

Laminated Glass:
SGG STADIP, SGG STADIP PROTECT laminated glass and SGG STADIP SILENCE acoustic laminated glass in most common configurations.

Product Construction

SGG PLANITHERM is manufactured on a magnetron coater. A unique combination of metal oxide layers are applied to high quality SGG PLANILUX clear float glass using a  magnetically enhanced cathodic sputtering process under vacuum conditions.

For Curtain Walling construction:

The system is fabricated in “stick” form, is pressure equalised, and self-draining by means of overlapping the transoms onto the mullion members. Water is then channelled to the exterior of the building via the integral drainage chambers within the mullions. Where the transoms connect to the mullions, the joint is sealed by means of a purpose designed transom end seal. The transom members are square cut and fixed securely to the mullions by means of spring cleats design to fit into integral ports within the cavity of the transom wall.

The system is dry glazed using proprietary, high performance captive gaskets internally. All internal gaskets are bonded and sealed during construction, using waterproof adhesive to ensure that a watertight joint at all cruciform connections is maintained at all times. The system is thermally broken throughout by means of a continuous thermal isolator located between a choice of aluminium or thermally enhanced pressure plates and all structural members. The thermally enhanced pressure plate is held in place by aluminium stitch plates. The pressure plate is retained by using stainless steel self-tapping screws. Carefully designed fixing brackets have been developed for the curtain walling system to allow a secure and simple fix so that all loads can be transferred back to the building’s main structural form with ease.

For Window construction:

Frame members are mitre cut at 45°, corners are reinforced with extruded aluminium crimping cleats and corner braces, and a secure joint is formed by pneumatically crimping into the extruded crimping cleat. Mullion and transom bars are square cut shaped and fixed securely to the frame by means of stainless steel screws and fixing cleats. All frame joints are sealed during construction against entry of water using a two-part adhesive. 


Aluminium profiles are extruded from aluminium alloy 6060T6, T5 or T4 complying with the recommendations of BS EN 12020-2 / BS EN 755 Parts 1 to 9. Polyamide thermal breaks are produced from glass reinforced nylon sections designed to withstand temperatures in excess of 200°C, allowing the sections to be powder coated after thermally breaking.

The range of sections can be provided in either of the following ranges of finishes:

1:            Anodised to BS 1615 or BS 3987 or BS EN 12373-1

2:            Powder organic coated to BS 6496 or BS EN 12206-1

This system can accommodate a different colour finish internally to that used externally.
The powder coating is produced to Qualicoat standards.

To learn more about this product and for detailed information browse through the datasheets below.