supplier list
- SIGMA China
- Tel:8008193336 /800 736 3690
- Address: 22 floor century building A-B 398# huaihai road Shanghai (PO Box 14508 St. Louis, MO 63178 UNITED STATES)
- Sigma-Aldrich Chemie GmbH
- Tel:800 558-9160
- Address: Industriestrasse 25CH-9471 Buchs SGSwitzerland