EPDM with high Mooney viscosity and limited oil extension
Arlanxeo has launched Keltan 13561C DE, a semi-crystalline EPDM grade with a high Mooney viscosity for demanding rubber applications, which is particularly suited for applications in the automotive industry.
According to Arlanxeo, the new product delivers good mixing and fast extrusion behaviour with high elasticity and collapse resistance in high filled compounds, supporting the reduction of overall compound volume costs. When replacing existing EPDM polymers, Keltan 13561C DE can improve the mechanical properties in EPDM compounds with the same compound loading, said the company. The product is the first Keltan grade with five digits, indicating its high Mooney viscosity. It has a product viscosity of 130 Mooney Unit (MU) – higher than any other current Keltan EPDM grade, said Arlanxeo.
Although the company does offer products with higher polymer Mooney’s, these are created by adding much more extender oil to the product. Gosé van Zandvoort, Technical Manager at the Arlanxeo Business Line Keltan: “Here we have a polymer Mooney of 150 MU and are adding “only” 15 parts of extender oil to the product, resulting in a product viscosity of 130 MU. The result is a five-digit code and a unique grade.” Customers, who tested the new grade for e.g. automotive sealing applications, reported that they have a choice of either benefiting from improved physical properties or from being able to add more fillers and oil to the rubber mixture to reduce compound costs.
Besides automotive solid seals, another application is rail tunnel and waste water seal compounds, where Keltan 13561C DE provides good mixing and processing properties for both extrusion and moulding technologies, whilst it meets the full set of technical requirements according to DIN EN 681-1 (cold water). The finished product offers weather and ozone resistance during outside storage for a longer time. Additionally, Keltan13561C DE is able to provide a one polymer solution for automotive coolant hoses, said Arlanxeo.
Chretien Rooijakkers, Head of Global Marketing for the Business line Keltan: “This new Keltan grade is not only unique in our portfolio, but also in the global EPDM market. We are currently starting to develop recipes for demanding applications to explore the full potential of this product and are considering creating further variants with different ethylene- and ENB contents.” The new Keltan grade is manufactured at Arlanxeo’s EPDM plant in Changhzou, China, using Keltan ACE polymerisation technology. It was launched in China and South America and product samples from commercial plant production are now available world-wide.