Hours of Availabilty for Chemical Abstracts Online

Chemical Abstracts Online through STN is available for searching only during the following times (all times given are for Pacific time zone):

Saturday/Monday     10:00 PM Saturday to 5:00 AM Monday
Monday – Thursday    5:00 PM to 5:00 AM the following day
Friday/Saturday        5:00 PM Friday to 7:00 PM Saturday*
                                 *On the first Saturday of each month, STN is only available until 2:00PM
If you cannot get in during these times, the STN International computer could be down.  You may call CAS Customer Care Monday - Friday from 5:00AM to 5:00PM (Pacific time) at:

1-800-753-4227 (toll free in North America only)