Restek has been a leading developer and manufacturer of chromatography products for over 30 years. We are the last major independent provider of chromatography supplies and proudly work with anybody running any make or model of LC or GC. Analysts around the world rely on our innovative products and unbeatable Plus 1 support to monitor the quality and safety of air, water, soil, food, pharmaceuticals, chemicals, and petroleum. GC Columns: A full selection of general-purpose and specialty stationary phases available on highly inert Rxi fused silica or unbreakable MXT stainless steel; choose from WCOT columns, PLOT columns, packed or micropacked columns, and more. LC Columns: USLC technology offers the widest range of selectivity in the industry with just a handful of phases to simplify column selection for HPLC and UHPLC; choose from Force, Raptor, Roc, and other silica supports for analytical and prep columns. GC and LC Accessories: Tools, maintenance supplies, and instrument replacement parts that meet or exceed original equipment manufacturers'? performance; innovative, lab-proven, and available for every make and model of instrument. Reference Standards: Over 1,500 different stock formulations on the shelf and ready to ship; both stock and custom certified reference materials (CRMs) manufactured and QC-tested in ISO-accredited labs. Air Sampling: Air sampling canisters featuring RAVE valves, gas calibration standards, gas sampling bags, personal air samplers, thermal desorption (TD) tubes, and more; Siltek and Sulfinert treatments for unsurpassed inertness. Sample Preparation: Resprep solid phase extraction (SPE) and protein precipitation (PPT), Q-sep QuEChERS, solid phase microextraction (SPME), ASE extraction, sample filtration, vials, syringes, and other sample prep products. Restek Corporation became 100% employee-owned on January 1, 2009. Today, more than 350 owner-employees work in a state-of-the-art facility in Bellefonte, PA; in our California-based research facility; and in subsidiary locations in China, France, Germany, Italy, Japan, and the United Kingdom. In addition, the Restek distribution network covers over 100 countries across six continents.