reliable supplier

of pre-insulated pipes for different applications

Radius-Kelit becomes RK Infra!

New name, same quality. Radius-Kelit is now RK Infra!

Along with the name change, we have also renewed our company logo, which now appears in a modern design.



proven quality


efficient solutions


"Combined know-how to achieve the best results in the district heating industry"

Know How

RK Infra GesmbH, a member of the international Radius-Systems Group, is an Austria-based manufacturer with more than 50 years of experience in the design, production and sales of pre-insulated pipe systems.


Product ranges include high-quality conventional rigid and flexible pipe products and a new class of flexible pre-insulated reinforced plastic pipe systems that open up new opportunities for heating networks. Through sister companies and partner RK Infra is serving the European market.

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Maintained quality system

The high quality of products manufactured by RK Infra is ensured by the continually maintained quality system, which meets the ISO 9001 standard and is certified by TÜV (Technical Inspection Association).The company is also certified to the environmental standard EN 14001.

The reliability and high quality of flexible pre-insulated pipes is confirmed by Austrian accredited certification body OFI CERT, as is evidenced by certificates according to OFI CERT ZG 200-1,2 technical specification.

ISO 9001 ISO 45001 ISO 14001 OFI Cert

Highly Energy efficient solution

The high efficiency of the foamed polyurethane (PUR) insulation layer (0.021 W/mK for cyclopenthane-based foam) proven by TGM Austrian accredited test institute, combined with a stable continuous insulation process of flexible pre-insulated pipes make RK HeatFlex and FibreFlex (Pro) a highly-energy-efficient solution for heating networks.

In August 2020, a new restriction on diisocyanates was passed into law under REACH. This restriction applies to all products containing free diisocyanates in concentrations of 0.1 percent or more. It specifies both the need for mandatory training for all employees in handling such products and additional labeling requirements.

The comprehensive training program is available on an online platform that was officially launched on November 1, 2021 and can be accessed via

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