Glass units

Comfort starts with the right glass

The insulating glass unit shapes warmth, daylight and noise in a room — so its build-up must match the project. We manufacture our glass units in our own factory.

What is an insulating glass unit?

An insulating glass unit is a sealed assembly of two or more panes separated by a spacer frame. Between the panes there are one or more cavities filled with dry air or gas. The edge seal and desiccant in the spacer keep the inside dry.

The combination of glass, coatings, spacer and gas defines the performance. The final result also depends on the profile system, correct installation and conditions in the building.

Double glazing

Two panes and one cavity. With the right coating and build-up it balances daylight and insulation.

Triple glazing

Three panes and two cavities. Higher insulation; the extra weight and thickness need a compatible system and hardware.

What makes the difference every day

Low-E glass

A special coating reduces heat loss while letting daylight through.

Four-season glass

Low-E and solar-control properties: less solar heat in summer, less loss in winter.

Argon filling

Argon conducts heat less than air and improves the unit’s insulation.

Warm-edge spacer

Reduces the thermal bridge at the edge of the unit and the risk of condensation.

Glass types

K glass, Sun or 4 seasons — which one where

Besides the number of panes, the coating on the glass makes the biggest difference. We offer three types — the choice depends on orientation, climate and the size of the glazing.

K glass

Low-emissivity glass with an invisible coating that reflects heat back into the room. It cuts heat loss in winter while letting in maximum daylight.

Warmth in winter
Heat protection
Daylight

Best for

North and east façades
Homes where heating is the main cost
Window replacement — the standard choice

Sun (solar control)

Glass that reflects and absorbs much of the solar energy. Rooms do not overheat and air conditioning runs less.

Warmth in winter
Heat protection
Daylight

Best for

South and west façades
Offices, shops and shop windows
Hot climates and strong sun

4 seasons

Multifunctional glass combining low-E and solar control. It keeps the warmth in winter and the heat out in summer — comfort all year round.

Warmth in winter
Heat protection
Daylight

Best for

Large and panoramic glazing
South-facing houses
Climates with cold winters and hot summers

Safety glass

Laminated and toughened glass

Both types of safety glass replace a standard pane in the glass unit — outside, inside or both. Thermal insulation is unchanged.

Laminated glass

Two or more panes bonded with a clear PVB interlayer. On impact the glass cracks, but the fragments stay bonded to the interlayer — they do not fall, do not cut, and the opening stays closed.

Safety — fragments do not fall and do not cut
Burglar resistance — much harder to break through
Quieter — with an acoustic interlayer
UV protection for furniture and floors

Typical use: Doors, shop fronts, floor-to-ceiling glazing, ground floors, balustrades, children’s rooms, noisy streets.

Toughened (tempered) glass

The glass is heated to about 650 °C and cooled rapidly. It becomes much stronger, and if it does break it shatters into small pieces with blunt edges.

Bending strength 120 MPa vs 45 MPa for standard glass (EN 12150)
Withstands a temperature difference of about 200 °C (standard glass about 40 °C) — no thermal cracking from sun and shade
Breaks into small blunt pieces instead of sharp shards
Cut and drilled only before toughening — sizes must be exact

Typical use: Large glazing and sliding doors, panes in strong sun or with dark coatings, showers, façades. On request with Heat Soak testing (EN 14179).

The best combinations

Choose the glass type by orientation and the number of panes by your insulation requirements.

In double and triple glazing one pane is always clear. Its position depends on the coating: with K glass the clear pane is outside and the K glass inside, so it keeps the heat in the room. With 4 seasons and Sun it is the other way round — they go outside and stop the sun before it enters, and the clear pane is inside.