Attention: Website ordering limitations

Sigma-Aldrich is currently experiencing a problem with our order management system. This impacts Africa, Europe, South America and most of Asia. During this time web ordering and real-time pricing and product availability are unavailable. Please contact your local Sigma-Aldrich office for assistance.


Proficiency Testing Materials from RTC

RTC is accredited by the ANSI-ASQ National Accreditation Board / ACLASS (certificate# AP-1469) to ISO/IEC 17043:2010 and as a TNI PT Provider. RTC also has a registered ISO 9001:2008 quality system.

RTC has been producing environmental LPTP for more than 20 years and regularly sends out more than 20,000 PT samples a year to over 2,500 participants throughout the world.

Proficiency Testing Product Categories include:
Air
DMRQA
Microbiological
Pharmaceutical
Solids/Soils Hazardous Waste PTs
Underground Storage Tank (UST)
Water Pollution/Waste Water
Water Supply/Drinking Water

PT Reporting System



Do you have questions or require technical support?
Please contact a PT product specialist at: RTCPTGroup@sial.com
Proficiency Testing Product List
RTC Study Schedule
Training videos for PT Reporting
Proficiency Testing Registration Form
Proficiency Testing Quote Request Form
Quick Turn Studies
RTC Permits and Accreditations


Technical Resources
Environmental PT Brochure
Environmental PT
Brochure
Microbiology PT Quick Reference Guide
Microbiology PT
Quick Reference Guide
Water Polution PT Quick Reference Guide
Water Polution PT
Quick Reference Guide
Water Supply PT Quick Reference Guide
Water Supply PT
Quick Reference Guide
Water Supply (low Level, DE) PT Quick Reference Guide
Water Supply (Low Level Germany) PT
Quick Reference Guide
Soils and Solids PT Quick Reference Guide
Soils and Solids PT
Quick Reference Guide

Permits and Accreditations


Click to view RTC Accreditation Details
ACLASS accredited ISO/IEC 17025:2005 Testing Laboratory (cert# AT-1467)
ACLASS accredited ISO Guide 34:2009 Reference Material Producer (cert# AR-1470)
ACLASS accredited ISO/IEC 17043:2010 Proficiency Testing Provider (cert# AP-1469)
ISO 9001:2008 Registered Company
EPA I.D. Number WYD988870218