The notice serves as a guide to federal procurement officials. But they tend to insinuate themselves into decisions made by suppliers of carrierboard and corrugated boxes affecting the price and availability of those packages to industry. Revisions proposed by the EPA March 15 1995 raised a host of very technical almost eye-glazing issues. EPA attempted to redefine "mill broke"--which is waste created in the paper-making process--in such a way as to effectively reduce the amount of pre-consumer waste generated by mills that could be included in the recovered fiber category. Industry objected and EPA relented leaving the existing definition untouched. EPA also proposed a 40 to 50% minimum post-consumer content for corrugated with a strength rating of less than 300 pounds per square inch (psi). For corrugated over 300 psi the proposed minimum was 30%. Industry said those minimums were unrealistic. In the final guidelines the EPA dropped the under 300-psi category to 25 to 50% post-consumer and the over 300 to 25 to 30% post-consumer. On carrierboard the EPA had proposed a minimum of 25% recovered fiber including 15% post-consumer. In the final guidelines the minimum of the recovered fiber range was dropped to 10% and the post-consumer range was set at 10 to 15%.