Pap-Flon Engineering Co. Pvt. Ltd. Manufactures Lined Patched Mushrooms for Vacuum Applications. Pap-Flon Engineering Co. Pvt. Ltd. Manufactures Lined Carbon Steel and Stainless Steel fabricated Components with fluoro polymer resins. The Lined Patched Mushrooms for Vacuum Applications are available in sizes of 1200mm Dia x 1500 mm length sections or as per client`s drawings.