- Before you purchase, you can check at www.restek.com/iso to see if your standard falls within our scope of accreditation. You can also ask Restek Customer Service or your local Restek representative.
- After you purchase, you can easily confirm that your standard is a CRM by looking at your certificate of analysis (CofA). For a standard to be considered a CRM, it must be both manufactured and tested in an ISO-accredited lab. Every certified reference material we sell will have A2LA/ILAC logos in the upper right-hand corner of its CofA, signifying that it was both manufactured and tested under our ISO 17034 and ISO/IEC 17025 accreditations. The CofA will also state “Certified Reference Material” at the top.
Please note that our gas reference standards are not within our scope of accreditation, so they are not certified reference materials (CRMs).
