Guardian Industries UK Glass Division

Conservatory Glass

Guardian Sun

Guardian Sun is a conservatory wall glazing solution, it is a high performance Low E glass which offers a 1.0 U value, combined with a low solar factor of just 43%. Guardian Sun is quite unique in its performance as it offers an exceptionally low reflection of 17% inside and 19% outside, which is rarely seen in thermally insulating Low E glass providing this level of performance. Designed specifically for the residential window market and now for Conservatory wall glazing, Guardian Sun offers the ideal solution to help keep Conservatories cooler in summer and warmer in winter.

General Info

Coating Guardian Sun
Glass Surface Coating Position 2
Glass Substrate: ExtraClear Float Glass or Laminated Glass
Available Thicknesses: 4mm
Max Height: 6000mm
Max Width: 3200mm
Heat Treatable: Annealed and heat treatable version available
Edge Deletion Required: Yes
Application must be within an insulating glass unit: Yes

Manufacturing Options

  • Heat Soaked
  • Heat Strengthened
  • Single Sided Coating
  • Toughened / Tempered

Typical Applications

  • Conservatories & orangeries
  • Windows and doors

Double Glazing Performance Figures

4/16/4 Insulating Glass Unit - Guardian Sun Surface 2, ExtraClear Float Inner Pane

Total light transmittance 70%
Light reflectance external 21%
Light reflectance internal 19%
General colour rendering index 94%
Ultra-Violet transmittance 26%
Solar Energy
Solar direct transmittance 42%
Solar direct absorption 20%
Secondary internal heat transfer factor 2%
Total solar energy transmittance (solar factor / g value) 44%
Total shading coefficient (g/0.87) 0.50
Selectivity Index
Selectivity (LT / g) 1.59
Thermal Insulation (U-value)
Thermal conductance with air (W/m2K) 1.3
Thermal conductance with 90% argon (W/m2K) 1.0
Thermal emissivity of coating 0.01

The above performance values are calculated in accordance with EN410 and EN673, subject to fabrication tolerances.


Manufactured in accordance with EN 1096: Glass in building - Coated Glass

Performance data is calculated in accordance with EN 410: Glass in building - Determination of luminous and solar characterictics of glazing

Where performance data is given for double or triple glazed units, the calculation is performed in accordance with EN 673: Glass in building - determination of thermal transmittance (U value) - Calculation method


Glass Systems Ltd

IGU Manufacturer

Mill Stream Way, Central Business Park, Swansea Vale, Swansea, West Glamorgan, SA7 0AE, U.K.

Float Glass Industries

Everseal IG Units, Glass Distributer and Processor with Jumbo capability

Float Glass House, Floats Road, Roundthorn Ind Est, Manchester, Lancarshire, M23 9QA, U.K.

Independent Glass Co Ltd (Toughened Division)

Toughened Division

540 - 550 Lawmoor Street, Dixon Blazes Industrial Estate, Glasgow , Lanarkshire, G5 0UA, Scotland

Independent Glass Co Ltd (Merchanting Division)

Merchanting Division

Quay House, Quay Road North, Rutherglen Industrial Estate, Glasgow , Lanarkshire, G73 1LD, Scotland

Epwin Glass

Manufacturer and supplier of insulated glass units.

Lodge Way, Lodge Farm Industrial Estate, Northampton, Northamptonshire, NN5 7US, United Kingdom

Tripleseal IG Limited

Sealed Unit Manufacturers and Glass Suppliers.

20 Lanrick Road, London, E14 OJF, United Kingdom

Find your nearest suppliers


National Suppliers

Carey Glass UK

Commercial and Domestic Sealed Unit Manufacturers. Glass Tougheners and Processors.

Manor Lane, Howarden, Flintshire, CH5 3PP, UK

Float Glass Industries

Everseal IG Units, Glass Distributer and Processor with Jumbo capability

Float Glass House, Floats Road, Roundthorn Ind Est, Manchester, Lancarshire, M23 9QA, U.K.

System 3 Ltd

IGU manufacturer for both domestic and commercial projects

Denton Hall Farm Road, Denton, Manchester, Lancashire, M34 2SY, U.K.

Safeguard Glazing Supplies Limited

Commercial & Domestic Sealed Unit Manufacturer

Manor Drive, Paston Parkway, Peterborough, Cambridshire, PE4 7AP

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