Up to 9°C cooler in summer

ClimaGuard - Official trade supplier

ClimaGuard 365: high-performance low-e glass for the home

A glass for every day of the year. Built using Guardian's SN 75 SunGuard® low-e glass coating.

Up to 9°C cooler in summer

Retains warmth in winter

Beautifully clear

Ug value: 1.0 W/m²K

Abstract gradient of white, blue, and purple hues with a dark purple base.

Cool in summer

ClimaGuard 365 reduces solar heat entering the home by as much as 38%. It leaves homes feeling up to 9°C cooler in summer – no expensive A/C required.

Warm in winter

When winter arrives, ClimaGuard 365 helps retain heat from radiators and keep energy bills down. It's a glass for all seasons and every home.

Beautifully clear low-e glass

Unlike thermal window films, ClimaGuard 365 is designed to stay crystal-clear and energy-efficient for many years. Its soft-coated low-e glass technology achieves 75% visible light transmission in a double-glazed IGU.

What is ClimaGuard 365?

ClimaGuard 365 is a high-performance low-e glass built for residential use.



Harnessing Guardian's proven solar control and thermal insulation technologies, it's designed to make living spaces more comfortable, more beautiful and more energy-efficient.


Summer, winter, hot spell or cold snap. It's year-round comfort, built into the glass

Up to 38%

reduction in solar heat entering the home

Up to 9°C

cooler in summer

75%

visible light transmission

1.0 W/m²K

Ug value

When 80% of your windows and doors are made of glass, getting it right matters.

Don't just take our word for it. ToughGlaze has earned top industry certifications for the quality of our products and manufacturing processes.

Energy-efficient glass for every corner of the home

Windows

Sliding doors

Bi-fold doors

Skylights

Conservatories

Glazed extensions

ClimaGuard 365 vs thermal glass films

ClimaGuard 365 offers superior performance and longevity compared to most aftermarket thermal glass films.



That's thanks to Guardian's soft-coated low-e glass technology. Tested and proven in demanding industry projects, it's now available as a durable insulated glazing solution for homeowners across the UK.


For your customers, it's about getting it right first time. ClimaGuard 365 is an investment – in comfort, in cost savings and for the future.

Feature / Attribute ClimaGuard 365 solar-control glass Aftermarket thermal glass films
What is it? Energy-efficient glass with built-in thermal insulation and solar control A separate film bonded to the glass surface
Installation Installed as part of a replacement/new double-glazed unit Retrofitted onto existing glass
Thermal insulation Ug value of 1.0 W/m²K in standard double-glazed configuration Typical Ug value of 1.8 to 2.3 W/m²K when applied to double glazing
Appearance Clear, neutral glazing – 75% visible light transmission in a double-glazed IGU Can alter the appearance of existing glass, creating a tinted or hazy effect
Longevity Performance is integrated into the glass itself and protected by the IGU Typically exposed to exterior conditions; can peel or become brittle with time
Can be installed on a single glass pane? No – supplied and fitted as part of an IGU Yes

ToughGlaze: trusted by the trade since 1993

Delivery? Relax – we've got it covered.

ToughGlaze is an ISO 9001:2015-accredited glass processor based in Bedford, UK. We've supplied trade customers with high-quality glass products since 1993.

ClimaGuard 365 is a collaboration between ToughGlaze, Guardian Glass and Morley Glass. We're proud to be the official trade supplier of this revolutionary, high-performance low-e glass product.


For you, that means peace of mind. At ToughGlaze, we cut, process and ship all our glass products under one roof. You can be sure the glass you get will be right on time and right on spec.


  • Available as annealed, toughened, heat-strengthened or laminated glass
  • Heat-soak testing available
  • Supplied as part of a double- or triple-glazed IGU (no single-pane option)
  • All processing performed in-house to UK/EU standards

Certified for quality and compliance

ISO 9001:2015

Kitemark

BS EN 12150 for toughened glass

BS EN 14449 for laminated glass

FORS Silver accreditation

Visible light

Transmittance (τv): 75%

Reflectance outside (ρv): 13%

Reflectance inside (ρv): 14%

General colour rendering index (CRI): 95

Visible light

Transmittance (τv): 75%

Reflectance outside (ρv): 13%

Reflectance inside (ρv): 14%

General colour rendering index (CRI): 95

Solar transmittance (τe): 38%

Reflectance outside (ρe): 39%

Reflectance inside (ρe): 42%

Solar absorptance (αe): 23%

Solar factor (g): 40%

Shading coefficient (sc): 0.46

Ug value: 1.0 W/m²K

Ultraviolet

Solar energy

Transmittance (τuv): 13%

Thermal properties

GLASS: Guardian ExtraClear (CE) glass, 6 mm (coated)

GAP: 10% air, 90% argon, 16 mm

GLASS: Guardian ExtraClear (CE) glass, 4 mm

ClimaGuard 365 solar-control glass specifications

Performance data

GLASS: Guardian ExtraClear (CE) Glass, 6 mm (coated)

GAP: 10% air, 90% argon, 16 mm

GLASS: Guardian ExtraClear (CE) Glass, 4 mm

GAP: 10% air, 90% argon, 16 mm

GLASS: Guardian ExtraClear (CE) Glass, 4 mm (coated)

Visible light

Transmittance (τv): 75%

Reflectance outside (ρv): 13%

Reflectance inside (ρv): 14%

General colour rendering index (CRI): 95

Ultraviolet

Transmittance (τuv): 13%

Solar energy

Solar transmittance (τe): 38%

Reflectance outside (ρe): 39%

Reflectance inside (ρe): 42%

Solar absorptance (αe): 23%

Solar factor (g): 40%

Shading coefficient (sc): 0.46

Thermal properties

Ug value: 1.0 W/m²K

Product information

Substrates Guardian ExtraClear 4-12 mm Guardian UltraClear 4-12 mm Guardian NEXA 4-10 mm
Processing options Annealed Heat-strengthened Toughened Laminated Heat-soaked
Recommended coating positions Surface 2 (double IGU) Surface 2 (triple IGU)
Maximum size <3,210 x 6,000 mm
Edge deletion Yes
Glass type Double silver-coated low-e glass
Fabrication options Supplied in an IGU
Appearance Neutral

Your questions answered

  • What does "low-e glass" mean?

    Low-e glass (low-emissivity glass) has a thin, transparent coating that reduces the amount of heat that can pass through the glass by radiation. It's commonly used in energy-efficient double- and triple-glazed windows to improve thermal insulation.


    Low-e glass is sometimes called "thermal insulating glass" or "solar-control glass".

  • How does low-e glass work?

    The low-e coating reflects infrared heat back towards its source. In winter, this helps reflect heat from inside the home back into the room, reducing heat loss through the glazing. Depending on the type of coating, low-e glass can also help limit solar heat gain in summer while still allowing visible light to pass through.


    ClimaGuard 365 is a high-performance low-e glass designed for all seasons. As well as retaining heat in winter, it can make the home up to 9°C cooler in summer.

  • Does low-e glass have a tint?

    Low-e glass can appear tinted or reflective when viewed under certain lighting conditions. This is a natural byproduct of the low-e coating.


    However, ClimaGuard 365 is designed from the ground up to be a beautifully clear low-e glass product. Its double-glazed configuration achieves 75% visible light transmission and a colour rendering index (CRI) of 95, helping retain natural light and a neutral, natural-looking appearance.

  • Is ClimaGuard 365 low-e glass available as single panes?

    No. ClimaGuard 365 is only available as part of a double- or triple-glazed IGU. That's because the low-e silver coating is protected by the IGU assembly.

  • What does ClimaGuard 365 low-e glass cost in the UK?

    At ToughGlaze, we cut and process ClimaGuard 365 to your exact specifications. For a personalised quote, please don't hesitate to get in touch and discuss your needs with our experts.

Become a trade partner today

When you work with ToughGlaze, you get the extra mile as standard. Our customers trust us for our quality, our service and our commitment to delivering real value.



Whether you want to place an order, request a quote or just have a few questions, get in touch today. We're always ready to help.