Pilkington Optitherm™ S1 Plus is an off-line coated, single stock product, offering superior thermal insulation performance with Ug-value of 1.0. Our own range of energy-efficient double glazed units for use in domestic applications.

Explore Pilkington K Glass™ | the original hard‑coated low‑emissivity glass trusted in the UK for over 20 years. Optimised for energy-efficient insulating glass units, it reflects heat to reduce heating costs while maintaining high light transmission.

Explore the Pilkington energiKare™ range | a selection of double and triple glazing solutions designed to enhance home energy efficiency. Reduce heat loss, increase solar gain, and lower heating bills with our advanced insulating glass units, available nationwide.

** g-value depends on which thermal insulation glass is selected as inner pane (all based on 4 mm thickness) For higher g-values please refer to our Thermal Insulation glass product range

Pilkington Optifloat™ Clear is premium, environmentally responsible high‑quality float glass offering exceptional light transmission, durability and recyclability. Ideal for glazing, IGUs, partitions, and available toughened or laminated for safety and performance.

Optimised for energy efficiency, thermal insulation (U‑value down to 1.0 W/m²K), high light transmission, and striking aesthetics. Suitable for IGUs, available in clear, neutral, blue or silver finishes.

Install low emissivity (low-e) energy-efficient windows to help to reduce your heating bills by up to 20% each year. Using a product from our energy-efficient glass range in your windows will reduce your home’s CO 2 output, making your carbon footprint smaller and your home more environmentally friendly.

Thermal Insulation Improves the energy efficiency of domestic or commercial buildings whilst enabling the extensive use of glass and the benefit of passive solar gain.

Pilkington K Glass™ is the UK’s leading thermal glass brand. Established for over 30 years and easily stocked, processed and installed, it has become the trusted solution for meeting Building Regulations concerning energy efficiency.

Which glass can reduce heat loss in winter? We offer a range of products which can provide thermal insulation to reduce heat loss in winter: ... Use our online Supplier Finder to find your nearest supplier of Pilkington UK glass. Was this helpful?