Iso-Chemie has secured an international energy-efficiency certificate for its multi-functional joint sealing tape, Iso-Bloco Hybratec.

Awarded the ‘Certified Passive House Component’ label by the Passivhaus Institute in Darmstadt, Germany, the tape can now officially be used in the construction of passive energy houses across the UK and Europe as a window connection air tightness system.

In passive house construction, it is important for a building to be extremely airtight to minimise heat input required to warm the house. Iso-Bloco Hybratec is a multi-functional window joint tape featuring the latest in hybrid technology to provide effective three-level sealing in line with RAL energy performance standards and resistance to driving rain in excess of 1050 Pa.

In tests, the tape was found to have excellent air tightness and thermal protection when it came to the sealing between the inner room and external climate. Uncontrolled convection heat losses and draughts via the connection joint can be effectively eliminated – an important requirement in energy-saving construction. Iso-Bloco Hybratec also combines considerable expansion force with excellent functional reliability in terms of capacity to absorb long term movement and expansion of windows.

Andy Swift, Iso-Chemie’s sales and operations manager, said the achievement reinforced the product’s outstanding thermal values, ensuring its advantages for passive energy installations.

He added: “Iso-Chemie has a strong commitment to providing customers with high quality innovative products, so passive house certification for Iso-Bloco Hybratec is another significant achievement and step forward for us.”