VHG Labs’ focus on quality begins with the starting materials for our solutions. We use the highest purity elements and compounds available (typically 99.999+%) as well as high purity acids and solvents. Metals are acid pre-cleaned and rinsed with high purity water, and salts are dried to a constant weight. Solutions are prepared gravimetrically, in an ultra-clean environment. Acid digestions are performed in pre-cleaned, high density polyethylene (HDPE) or TeflonTM containers to avoid contamination from the reaction vessel. Balances and volumetric flasks are calibrated according to NIST procedures. All bottles are acid leached and then triple rinsed in deionized water prior to use. Petroleum standards are blended in pre-cleaned HDPE or glass reactors.
Each VHG calibration standard is subjected to rigorous QA checks prior to shipment. Raw materials are assayed and analyzed for trace impurities. Major constituents are generally verified both instrumentally, against the appropriate NIST SRM (when available), and through classical wet chemical methods (titrimetry or gravimetry). All VHG standards are accompanied by a comprehensive Certificate of Analysis (COA). Each COA is supported by an unbroken chain of comparisons with traceability to national or international standards of measurement.
VHG Labs is committed to providing high-quality certified reference materials, produced in accordance with the requirements of ISO Guide 34:2009. Additionally, we are registered to ISO 9001:2008 for Quality Programs, and certified in accordance with the requirements of ISO/IEC 17025:2005 for Chemical Testing, and ISO:17043 for Proficiency Testing.
We consider accreditation through independent agencies essential, giving you confidence in the products and service we provide.