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Herts: 01438 311 412

Bucks: 01494 355 195

07757 789 004

Bucks: 01494 355 195





Energy efficient Pilkington K glass

Today energy efficiency is very important for a variety of reasons. Energy efficient glass saves you money on heating bills and we have all seen those go up massively in the last few years. Energy efficient glass is also very important for helping to combat global warming by reducing the amount of fossil fuels burnt to heat our homes and offices.

ASPECT Windows and Doors uses the latest energy efficient glass called Pilkington K™ from Liniar. The Pilkington K glass™ is used in our double glazing units and can reduce the amount of energy lost by up to 90% when compared to single glazing.

Pilkington K Glass TM

Pilkington K Glass™

Pilkington K Glass™ is the UK's leading solution for thermal insulation in homes and office. It is a low emissivity coated glass which is easily stocked, processed and installed. Pilkington K Glass™ has been available for over 15 years making it the trusted solution for meeting energy efficiency regulations.

Pilkington K Glass™ is usually used for the inner pane of an insulating glass unit such as the latest energy efficient glazing, Pilkington energiKare™. The coating used on Pilkington K Glass™ works by reflecting heat back into the room while also allowing heat from the sun to pass into the room. Windows incorporating Pilkington K Glass™ achieve high Window Energy Ratings and are complient with the energy saving Building Regulations Part L.

How Pilkington K Glass™ works

Heat travels in three ways; conduction, convection and radiation. Windows with single panes of glass easily conduct heat to the outside air. Double glazing reduces this by incorporating an air gap between the panes. Air is a poor conductor of heat so the amount of heat which can be conducted to the outside is greatly reduced.

Pilkington K Glass TM - how it works

Convection is the transfer of heat by air motion. The small air gap between the panes of glass in a double glazing unit hampers air movement reducing the amount of heat transferred from the internal pane to the external one.

The only possible way heat can reach the Earth from the Sun is by radiation. The radiated heat enters our homes via the glass in windows and doors to help warm the house. Unfortunately normal glass allows heat radiation to pass through both ways which results in heat lost from the home to the atmosphere.

The glass in windows absorbs heat then radiates it again on the colder, outside surface. Pilkington K Glass™ has a low emissivity coating on the internal side of the inner pane of glass. The special coating is a poor radiator of heat so any heat gained by the coating is directed back into the room.

FENSA regulations

All glass windows and doors conform to FENSA regulations. At ASPECT Windows and Doors we use Pilkington K Glass™ and Planitherm Glass™.

Energy efficiency

The cost of energy has shot up recently so any way in which energy can be saved is a good thing. New regulations have been introduced in the UK to control the requirements for energy efficiency. Energy ratings are now required when buying ans selling a house and the glass used in windows and doors plays an important role. Heat loss through glass is usually expressed as the 'U' value. Windows and doors which include glass with lower U values can help the energy saving capacity of a property.

Further Information

If you would like to know more or are interested in a quote we would be happy to help. Phone us on 01438 311 412, email us at or fill in our enquiry form and we will be in touch as soon as possible.

Energy efficient

The glass we use in all projects is the latest "A" Rated, energy efficient, low emissivity (Low-E) glass.

Safe and secure

All of our windows, doors and conservatories are built with security, strength, durability as well as style.

Repairs and maintenance

At ASPECT Windows and Doors we offer a full repair and maintance service for doors, windows and conservatories.

ASPECT Windows and Doors are FENSA <b>MCT</b> registered

ASPECT Windows and Doors are FENSA MCT registered

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Aluminium sliding doors and folding doors from REYNAERS

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ASPECT Windows and Doors

t. 01438 311 412 | m. 07757 789 004 | Email us

75 Sparrow Drive, Stevenage, Hertfordshire SG2 9FB

ASPECT Windows and Doors
t. 01438 311 412

ASPECT Windows and Doors is a trading name of Window Care Herts Ltd
Company No. 07340625 | VAT No. 102 8284 39 | Fensa Reg. No. 23874