Inquiry (采购产品): Shelf Life I am the QC Manager/Chemist for Century Flight Systems in Mineral Wells, TX. We are a manufacturer of autopilots. We use several gaskets in our product that are manufactured from Vellumoid. The are stored in sealed bags our of the light in an airconditioned/heated environment. What is the maximum expected shelf life of this material in this environment. Also, is there a test that i can perform to extend the shelf life. Thank You for your time, Mike Allen **** Hidden Message ***** mike allen 76067 USA Company: Century Flight Systems, Inc. Title: QC Manager E-mail: mikea@centuryflight.com **** Hidden Message ***** mikea@centuryflight.com