Airgas offers a complete line of laser gases. To mee the precise and consistent purity specifications needed for optimal laser performance, we produce our gases under the strictest quality control, from production through cylinder fill. Our manufacturing facilities incorporate the highest standards to help ensure that each cylinder meets or exceeds required purity and tolerance levels.| See the applicable Blend Tolerances and Analytical Tolerances pages under the Gas Mixtures Tab on the Menu of our Specialty Gas & Equipment Catalog for detailed information of gas mixture grade. http://www.airgassgcatalog.com/catalog/