AccuSPEC IC Standards come complete with a Certificate of Analysis providingNIST traceability, certified concentration and uncertainty.GHS compliant labeling and SDS (Safety Data Sheets)Available in 2 convenient formats to meet your needs: 125 ml and 500 ml.2 expiry dates - up to 24 months unopened & 15 months opened.Longer shelf life for unopened bottles - stock with confidence.