POLMEK Group

LOW-E GLASS

Energy Efficiency and Comfort Combined with Low-Emissivity (Low-E) Glass

Low-E glass, produced using advanced coating technologies, helps maintain ideal indoor temperature conditions throughout the year. In colder seasons, it reflects interior heat back into the space, minimizing heat loss and reducing the need for heating. During the summer months, it limits the amount of solar heat entering the building, preventing interior spaces from overheating. While offering these benefits, it also allows a high level of natural daylight to enter, creating bright and comfortable living environments.

LOW-E GLASS FEATURES

Low-E Glass: It is a heat control glass. Thanks to the Low-E coating, heat inside the room does not escape outside. For maximum heat insulation, it is recommended to use Low-E on both the outer and inner glass panes. It is an ideal solution for triple-glazed insulating glass units.
Tentesol and Tentesol Titanium: These are reflective (mirrored) solar control glasses. They limit the entry of sunlight during summer. Suitable for single-pane use with high insulation properties. When used together with Low-E glass, they provide solar control and energy savings.
Solar Low-E Glass: It provides both heat and solar control. While preventing heat from escaping the interior, it limits the entry of sunlight during summer. Typically used on the inner glass pane for maximum insulation and solar control. Suitable for triple-glazed insulating glass units.
Tempered Low-E Glass: Low-E coated tempered glass. Thanks to the tempering process, it provides safety by breaking into small, blunt pieces instead of sharp shards. It is up to 5 times stronger against impact loads.

Performance Parameters

Visible Light Transmittance (%): The percentage of visible light passing through the glass. Higher transmittance means more natural light.
Visible Light Reflectance (%): The percentage of incoming sunlight reflected outward by the glass. Higher reflectance reduces solar heat gain.
Solar Factor (g-value %): The percentage of total solar heat energy transmitted through the glass. A lower g-value means better solar control. For example, the g-value of 3 mm clear glass is 0.87, whereas Low-E glasses have a lower value.
Thermal Transmittance (U-value) (W/m²K): Indicates the glass's thermal insulation performance. A lower U-value means better heat insulation.
Color Rendering (Ra %): Shows how accurately colors appear when viewed through the glass. High color rendering provides natural and vivid colors, meaning less color distortion.

TECHNICAL DATA PDF

AVAILABLE CONFIGURATIONS

Low-E glass is available in the following configurations:

Single, double (IGU), or triple glazing (triple IGU) systems
Manufactured using hard coat (pyrolytic) or soft coat (sputter) technologies
Combined with tempered, laminated, or multi-layered custom glass assemblies

Depending on specific project requirements, Low-E glass can be combined with various performance-enhancing layers, including:

Solar control
Acoustic insulation: Enhanced sound reduction through laminated acoustic interlayers or asymmetric glass constructions to minimize external noise
Safety and security glass (laminated or tempered)
Tinted or reflective glass options

Especially in urban environments, near airports, or in high-noise areas, acoustic Low-E glass solutions provide both energy efficiency and superior indoor sound comfort.

LOW-E GLASS BENEFITS

Low-E glass (low emissivity glass) is a type of glass specially developed to reduce heat loss and control solar heat. Thanks to a very thin and transparent metal oxide coating applied to the glass surface, internal and external heat transfer is controlled.

Enhanced Thermal Insulation

Low-E glass significantly reduces heat transfer through the glazing surface, resulting in a lower U-value. This improves the building’s energy performance and reduces both heating and cooling loads.

Solar Control and Energy Savings

Low-E coatings limit solar heat gain (the SHGC value can be reduced depending on the glass configuration). This helps minimize air conditioning needs in hot climates, while in cold climates, it reflects indoor heat back into the room, preventing heat loss.

Protection Against UV Radiation

Low-E glass blocks up to 99% of harmful ultraviolet (UV) rays, helping to protect interior furnishings such as furniture, flooring, curtains, and artwork from fading and deterioration.

Natural Light Performance

Thanks to its high visible light transmittance (VLT), Low-E glass allows ample daylight into interior spaces while reducing glare and enhancing visual comfort.

Improved Indoor Comfort

Low-E glass reduces temperature differences near glazed surfaces, creating more stable, comfortable, and user-friendly interior environments.

Environmentally Friendly Solution

With lower energy consumption, Low-E glass helps reduce carbon emissions and contributes to environmental sustainability. It also supports compliance with green building certification systems such as LEED, BREEAM, and DGNB.

TEMPERING LOW-E GLASS

Temperable Low-E glass is preferred especially in exterior façade applications to meet durability and safety requirements. Additionally, tempered Low-E glass can be combined with laminated glass to provide both safety as well as acoustic and thermal comfort benefits. Depending on project requirements, Low-E glass can be applied in single, double (insulating glass units - IGU), and triple glazing systems.

Production Standards

EN 12150 – Tempered Safety Glass
EN 1279 – Insulating Glass Units (IGU)
EN 1096 – Coated Glass
ISO 9001:2015 – Quality Management System

COLOR OPTIONS

Common Colors of Solar Control Low-E Glass :

Color / Effect	Description
Gray	Provides a modern and neutral appearance Effectively reduces solar heat gain and glare.
Green	Available in light greenish tones. Offers a natural and environmentally friendly aesthetic.
Bronze / Brown	Delivers warm tones with a classic and elegant look Reduces solar heat impact while enhancing aesthetic value.
Blue	Presents a cooler, contemporary appearance. Commonly selected for buildings with sea or sky views.
Clear / Light Tints	Low-E coatings that minimally alter the exterior appearance while maintaining high performance. Ideal for maximizing natural light transmission.
Reflective	Limits visibility from the outside. Provides high reflectivity for enhanced solar control.

For other color options, please feel free to contact us.