Optimal Material from high-tech forge
The robust, double bond-free backbone of Levapren® consists of two components: Ethyelene and vinyl acetate. Polymers with this principal structure are often referred to as EVA although the correct designation should be EVM according to rubber nomenclature.
At a glance
- Possible to achieve vinyl acetate content of between 40 and 90 percent
- Excellent characteristics typical of rubber from 40 percent vinyl acetate upwards
- First-class mechanical property profile
- Low viscosity due to small number of branches
- Outstanding capacity to absorb large quantities of fillers
In principle, EVM rubbers have been around for 60 years. However, the real skill lies in finding synthesis processes which can be used to optimally and extensively control the ethylene and vinyl acetate contents in the molecule. EVM grades with a high vinyl acetate content of around 40 percent or above are of particular interest for sophisticated technical applications. However, the majority of EVM production methods are unable to produce this polymer cost-effectively.
The "medium pressure method" used at ARLANXEO removes these limitations. The EVM grades synthesized at ARLANXEO by the solvent process have high molecular weights, a low number of branches and an adjustable VA content of between 40 and 90 percent by weight.
Additional factors which are important for the characteristics of Levapren® vulcanizates include a statistically even distribution of the components in the ARLANXEO polymer which ensures a high-quality property profile. The outstandingly low viscosity of the raw material enables absorption of high filler quantities.