A.S.O. Design
   Supplier of Canadian certified reference materials (standards) for calibration of analytical instruments, and ISO-9000. Consulting services are also provided in the fields of X-ray fluorescence (XRF), X-Ray diffraction (XRD) and Thermal Analysis (DTA-TGA)
   http://asocanada.com/

Brammer Standard Company, Inc.
   Offers analytical reference materials for spectroscopy from around the world based in Houston, TX.
   http://www.brammerstandard.com/

C.P.A. Chemical products for analysis
   Offers standards and custom made, ready-to-use multi and mono-element solutions for AAS, ISP, MS and ILC, from Stara Zagora, Bulgaria.
   http://www.cpachem.com/

LGC Reference Materials
   LGC produces and supplies high quality certified reference materials and biomaterials throughout Europe on behalf of ATCC, USP, EP, NIST and BCR.
   http://www.lgc.co.uk/ref.asp

NIST Standard Reference Materials
   SRM lists over 1300 individual reference materials produced by NIST, with carefully assigned values for chemical composition and physical properties. MSDS, prices in US$ and sale to registered users, dispatched from Gaithersburg, MD.
   http://ts.nist.gov/ts/htdocs/230/232/232.htm

Referenz Certified Reference Materials
   Offer steel, iron and spectrochemical RM, PDF downloads include catalog from BAS CRM distributor for New Zealand and Australia.
   http://referenz.atnz.net/

Resource Technology Corp.
   RTC offers proficiency testing schedules, and manufacturers natural-matrix samples and certified reference materials in Laramie, WY.
   http://www.rt-corp.com/

Thorn Smith Laboratories
   Quantitative and qualitative unknowns, student reference standards, answer sheets, from Beulah, MI.
   http://www.thornsmithlabs.com/