The AIChE website is undergoing an ecommerce system upgrade to better serve you. Between 7 a.m. (EST) Friday, December 6 and 9 a.m. (EST) Monday, December 9 you will not be able to purchase or renew any AIChE products or services through the website.  If you want to place your order with a Customer Service representative during business hours on Friday, December 6, please call 1-800-242-4363 (US) or 1-646-495-1300 (outside of the US). The AIChE Customer Service department is not open Saturday or Sunday, but you may send an email inquiry to during that time. AIChE apologizes for any inconvenience. This upgrade will result in an improved online transaction experience for all.