Attention:

Certain features of sigmaaldrich.com will be down for maintenance Saturday afternoon/evening, February 24th starting at 3:00 pm CT until 9:00 pm CT.

Please note that you still have telephone and email access to our local offices. We apologize for any inconvenience.

Proficiency Testing

The Environmental PT studies are ACLASS (certificate# AP-1469) accredited, producing accredited NELAC Proficiency Tests to the relevant sections of ISO 17025 and ISO 17043. RTC also has a registered ISO9001:2008 quality system. RTC have 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.

Resources:

RTC Environmental PT Study Schedule
Quick Turn Studies
Request a Custom Quote
Sigma-Aldrich PT Web Reporting System for reporting and evaluating your results.
Training Videos for PT Reporting