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Keywords of this article:  extrusion 
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Arlanxeo has launched a semi-crystalline ethylene propylene diene monomer (EPDM) grade with a very high Mooney viscosity for demanding rubber applications, particularly in the automotive industry.

As introduced, Keltan 13561C DE delivers superior mixing and fast extrusion behavior 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 significantly improve the mechanical properties in EPDM compounds with the same compound loading.

This is the first Keltan grade with five digits, indicating its high Mooney viscosity. Keltan 13561C DE has a high product viscosity of 130 Mooney Unit (MU) – higher than any other current Keltan EPDM grade.

Although Arlanxeo does offer products with a higher polymer Mooney, these are created by adding much more extender oil to the product.

"Here we have a polymer Mooney of 150 MU and yet we are adding 'only' 15 parts of extender oil to the product, resulting in a viscosity of 130 MU. The result is a 5 digit code and a unique grade," explained Gosé van Zandvoort, Technical Manager at the Arlanxeo Business Line Keltan.

According to the company, customers who have tested the new grade for e.g. automotive sealing applications reported that they benefited from improved physical properties or from being able to add more fillers and oil to the rubber mixture to reduce overall compound costs.

Another key application of Keltan 13561C DE is waste water seal compounds, where it provides good mixing and processing properties for both extrusion and molding technologies, whilst meeting the full set of technical requirements according to DIN EN 681-1 (cold water). The finished product offers optimal weather and ozone resistance during outside storage for a longer time.

Additionally, Keltan 13561C DE is able to provide a one polymer solution for automotive coolant hoses.

This new Keltan grade is manufactured at Arlanxeo's EPDM plant in Changhzou, China, using Keltan ACE polymerization technology. It is now launched in China and South America. Product samples from commercial plant production are now available worldwide.

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