For use with UV-light sensitive samples. I-CHEM Certifiedâ„¢ 200 and 300 series bottles are processed to meet or exceed US EPA Specifications and Guidance for Contaminent-Free Sample Containers. The 200 and 300 series jars include sample-analysis labels, unattached. I-CHEM Certifiedâ„¢ 300 series bottles include a Certificate of Analysis with a bar-code production number in every case. The 300 series bottles have a manually readable bar-code lot label for absolute traceability and are for use with automated sample tracking systems. I-CHEMâ„¢ 100 Series bottles, for general use, are not processed or certified, and do not include sample-analysis labels.