For plastic parts that during use have to deal with high temperatures, Pentas makes use of polypropylene (PP). Polypropylene is stronger than polytheleen and can withstand higher temperatures, therefore makes it ideally suited for this application. The exhaust valve is used for the drain of water vapor (condensation) or evaporation gases (> 140 ˚ C) from the production process to the chimney, in which this product needs to regulate it. It is important that the product keeps it form at these high temperatures and stays dimensionally stable. There are different sizes and variants of this product.