Our sealed units are uniquely guaranteed for 10 years against failure of the hermetical seal.

It is the breakdown of this seal that causes misting. We only supply the best products across our whole product range and the humble sealed unit is no different.

Most other companies only offer a 5 year guarantee.



Below is a glossary of glazing terms which we hope will assist you.

Sealed unit construction: Our sealed units are typically manufactured using 4mm glass separated with a 20mm spacer bar.

Spacer bar: Available in widths from 6mm to 20mm and a range of colours to complement your window or door frames. Thermal properties can be further improved by specifying “Warm Edge Spacer Bars”.

Float Glass: Standard glass, typically used in sealed units to be installed in unheated structures such as porches or garages.

Low E Float Glass: Similar to float glass but incorporating a special invisible metal coating which increases the energy efficiency by reducing the transfer of heat or cold through the glass. This type of glass is typically used in domestic situations.

Toughened Safety Glass: Heat treated glass fitted in all doors and other locations specified by building regulations. It is up to five times stronger than float glass of the same thickness.

Low E Toughened Safety Glass: As above but incorporating the Low E coating. This type of glass is typically used in domestic situations.

Obscure Glass: Available in a wide range of patterns.

Tinted Glass: Tinted glass has been treated with a film or coating and is available in aqua green, bronze and blue. It can be used for visual appeal, to reduce glare or where a degree of ultraviolet and solar control performance is required.

Self Cleaning Glass: Uses the forces of nature to maintain a cleaner and clearer appearance. In a dual action process organic dirt is broken down by daylight and is then washed away by the rain. Available in clear and blue tinted glass this is a very popular choice for use in conservatories.

Laminated Glass: A type of safety glass that holds together when shattered. In the event of breaking it is held in place by an interlayer, typically of polyvinyl butyral (PVB), between its two or more layers of glass. Typically used to enhance the security of a property.

Internal Georgian Bars: 18mm or 25mm plastic bars incorporated internally within the sealed unit to give the effect of an authentic Georgian window.

Astragal Bars: Externally fitted bars to replicate Georgian windows even more closely.

Diamond or Square Lead: Lead is applied to both sides of the outer pane of the sealed unit in either a diamond or square pattern. Available in regular or antique lead.

Argon Gas: Enhances the thermal performance of the sealed unit.

Krypton Gas: A denser gas than Argon giving further thermal efficiency.

Xenon Gas: Denser again than Krypton to give even more thermal efficiency.