Supporting Scientist for a Safer Tomorrow. Spex CertiPrep has been servicing the scientific community since 1954. We are a leading manufacturer of Certified Reference Materials (CRMs) and Calibration Standards for Analytical Spectroscopy and Chromatography. We offer a full range of Inorganic and Organic CRMs. We are certified by DQS to ISO 9001:2015 and are proud to be accredited by A2LA to ISO/IEC 17025:2005 and ISO 17034:2016. The scope of our accreditation is the most comprehensive in the industry and encompasses all of our manufactured products. Spex SamplePrep has been the leading sample preparation solutions provider to analytical scientists worldwide for over 65 years. Our range of high performance and easy to use mill, grinders, homogenizers, presses and fusion fluxers are used for a wide range of analytical techniques including AA, ICP, GC/MS, PCR and XRF.