The EPE Wad in these Polypropylene Closures offer excellent sealing qualities for either Glass or Plastic Containers. Both the manufacturing process and the materials used are designed to be dust-free. Polycone Liners are cone-shaped Polythene Liners that offer the best sealing mechanism that a wadded Closure can provide. These are specifically used where light viscosity liquids, prone to seepage around the thread, particularly oily substances, are being packaged. The Polypropylene outer provides a robust and economical alternative to the original Thermoset version, with a Matt Black finish.