March 17, 2022
igus® has announced that it is the world’s first cable manufacturer to receive UL appliance wiring material (AWM) certification for its chainflex® cables halogen-free TPE cables. This is the first time the testing organization has recognized that halogen-free TPE cables can also meet fire protection requirements.
The independent organization, Underwriters Laboratories (UL), is a globally recognized authority in the field of safety science. UL certification means that a product has been tested to nationally recognized safety and sustainability standards.
According to statistics from the National Fire Protection Association (NFPA), electrical distribution and lighting equipment are the leading causes of structure fires in industrial properties.
“That is why we are particularly pleased that igus has now become the world’s first manufacturer to receive a UL seal for halogen-free TPE cables,” says Rainer Rössel, Vice President and Head of the chainflex® cables business unit at igus. “The approval demonstrates to our customers that they have the safety aspect with chainflex high-end TPE cables.”
Fire protection can also be achieved without halogens
For this certification, igus engineers had to do a lot of persuading. Up to now, the flame retardancy of cables has been the key factor in obtaining UL certification for fire protection. Approval is therefore only granted to products containing flame retardants such as chlorine, fluorine, or bromine. These additives increase the flame retardancy.
However, flame retardants generally change the chemical structure of the jacket and reduce the mechanical load-bearing capacity. Therefore, igus® starts much earlier in the process: The cable specialist focuses less on preventing a fire from spreading, but rather on how the cable itself caused the fire.
TPE jacket compounds from igus are extremely resistant to mechanical loads as well as external influences. They can therefore be used in a wide range of applications: in small installation spaces of up to 4xd, on highly dynamic, short travels with accelerations of 100m/s², or on long travels in a temperature range from -35°C to +100°C. At the same time, they are extremely resistant.
In all of these e-chain® applications, the halogen-free TPE jacket compounds from igus® minimize premature aging of the outer jacket by a factor of up to 10; when compared to the same materials containing flame retardants. A decisive cause of fire is reduced. This is because if the jacket does not break, the cable cannot cause a fire because a reduction in the cross section of the cores is impossible due to the non-existent jacket break. An argument which finally convinced Underwriters Laboratories.
Flame retardancy of TPE cables is no longer the measure of all things
With these measures, igus makes a significant contribution to increasing machine safety. The long-term flexural strength and service life of chainflex cables in e-chains have been proven by numerous practical tests in the igus test laboratory.
“So far, customers have already had the opportunity to choose from 1,044 chainflex cables with UL approval,” Rainer Rössel points out. “With the new certification, there are now more than 200 TPE cables, so we can offer an almost complete UL certified product range.”
Customers in Europe benefit from halogen-free chainflex cables, as do those who build machines for the North American market, where UL certification of individual components is required.