insulbar® shear-free – the dimensionally stable solution for thermally separated external doors

Usually it’s the weather’s fault when a metal door sticks. If the sun shines, its outer side expands. If it’s cold outside, however, the door bulges inwards. Ensinger now has a new solution to this well-known problem encountered with thermally separated metal doors, the bi-temperature effect (also known as the bi-metal effect): The shear-free insulating profile. It minimises this linear expansion and keeps the door in perfect shape even in the event of extreme differences between the external and internal temperature.

Deformed doors are a thing of the past

The new shear-free insulating bar (patent pending) consists of two intermeshing parts. With temperature-related, differing linear expansion of the inner and outer shells, the two parts shift against one another. This generates a moveable, corrective insulating zone which minimises the bi-temperature effect and evens out the differences in thermal expansion between the aluminium shells.

Aluminium assembly with normal insulating profile: the large temperature difference causes the door to become deformed.

Aluminium assembly with shear-free insulbar insulating profile: the flexible insulation zone evens out the differing linear expansion between the inner and outer shells effectively.

All the benefits at a glance

Shear-free, consequently a more significance minimisation of the bi-temperature effect compared to shear-weak and shear-resistant profiles
Minimal shear rigidity c and low shear strength T
Optimised geometry for high transverse tensile strength Q
Can be rolled up and laminated like a conventional insulating profile

You can already find the shear-free profile in a variety of sizes between 20 and 42 mm in our standard range and in the insulbar Finder under the section Special applications. You can also find further information in our brochure.