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Lanxess A.G. said it has developed Keltan 9565Q, an ethylene-propylene-diene rubber that can compete with natural rubber, which is susceptible to aging.
This new grade is characterized by its high molecular weight, Lanxess said, which gives the synthetic rubber its extremely high NR-type strength and resilience. As a saturated polymer, this grade still features the heat, weathering and ozone resistance typical of EPDM rubber. With these qualities, Lanxess said Keltan 9565Q not only is superior to natural rubber in terms of heat aging, but also can offer this benefit in highly dynamic applications. In addition, this new ultra-high-molecular Keltan grade opens new potential for more economical EPDM processing compared with NR, Lanxess claimed.
In rubber components subject to high stresses, natural rubber was considered almost indispensable, despite its heat sensitivity. Lanxess said the reasons for this dilemma are in the typical molecular architecture of the time-honored raw material.
With Keltan 9565Q, Lanxess said its chemists are taking a different, more sustainable approach—through improved synthesis they have been able to further increase the molecular weight of their new EPDM grade, thus achieving similar levels of dynamic performance as natural rubber, even after heat aging.
In terms of tear resistance and elongation at break, the material attains much better results than NR after 168 hours at 100°C and 120°C, which Lanxess said is where the fully saturated nature of the EPDM molecule makes itself felt.
For more information about Lanxess, click here.