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 customerservice@aiche.org during that time. AIChE apologizes for any inconvenience. This upgrade will result in an improved online transaction experience for all.