Products from NSI Solutions

Welcome to the vendor portal page for NSI Solutions, Inc., a quality supplier of:

• Environmental Proficiency Testing Standards
• Certified Quality Control Standards
• QC Standards & LCS Solutions for Pollutant Analysis in Water

Sigma-Aldrich is pleased to partner with NSI Solutions, Inc., to offer you products that complement our existing line of Analytical Standards. 

• NPW Inorganics Proficiency Testing and Quality Control Samples
• WS Inorganics Proficiency Testing and Quality Control Samples
• WS Microbiological Proficiency Testing and Quality Control Samples
• Oil and Grease QC Standards
• Turbidity Quality Control
• Solids Standards & Concentrates, pH Standards

Ordering Information

Please Note: Products from NSI Solutions cannot be ordered through the same processes used to order standard Sigma-Aldrich products. Instead, you must use our special Sigma-Aldrich Vendor Portal Order Form below. Also, at this time, shipments are limited to locations within the US only.

Sigma-Aldrich Vendor Portal Order Form (click to view/open PDF)

The above order form allows direct submission by E-mail, or you may print and submit by Fax (to: 1-888-286-7740). 

For Customer Service, to make a payment by credit card, or to place your order by Phone, please contact: 1-800-811-5352.