ViscoTec’s preeflow® line has launched a stainless steel version of the eco-PEN. Options include a stainless steel kit with which the classic plastic preeflow eco-PEN can be converted from POM (technically known as polyoxymethylenes or polyacetals) to stainless steel in just a few steps, as well as an eco-PEN that can be purchased as a complete stainless steel dispenser.

Acetone, alcohol, paint, and epoxy resin are just a selection of substances whose chemical properties challenge mechanical engineers in the implementation of customer-specific systems. However, POM plastics are not always the best choice for components and parts because they can become brittle over time when the product comes into contact with aggressive fluids. Unstable processes then result from the diminishing functionality of the component.

ViscoTec reports that the customer benefits of using stainless steel are manifold. The stainless steel version is resistant to fluxes for soldering, for example, but also tolerates oxidizing agents such as peroxides or ozone. Even plasticizers and organic and inorganic acids below PH4 can be dispensed in a process-safe manner over a long period of time. This offers advantages for a wide range of industries, especially the chemical industry. The application of the stainless steel version or the stainless steel kit is also beneficial in the electronics sector, particularly in applications where adhesives have to be dispensed automatically and at high cycle rates for the construction of housings. Dispensing technologies made of stainless steel guarantee that this equipment is not damaged by aggressive substances when it is cleaned.

In the stainless steel version of the preeflow eco-PEN, the threads for the inlet are also made of stainless steel. This offers customers even more safety. Particularly when dispensing processes are automated and a system is operated at enormously high cycle rates, the thread flank in the POM-in preeflow eco-PEN can deteriorate in quality over time. Pressure and high process speeds may then cause the material feed to break away. The stainless steel version is also suited for dispensing moisture-curing silicones and materials that react sensitively to moisture, as POM plastics absorb moisture.

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