The sample container specifications outlined in 40 CFR part 80, Appendix D, limit the materials and closure systems for sample containers, such that RFG properties will be maintained under normal conditions encountered during shipping (by air or ground), and long term storage at room temperature and pressure. Refrigerated storage is appropriate if desired. Refrigeration is not necessary, however, as long as temperature extremes (less than 0 degrees F, and greater than 120 degrees F) are avoided during storage.(7/1/94)

This question and answer was posted at Consolidated List of Reformulated Gasoline and Anti-Dumping Questions and Answers: July 1, 1994 through November 10, 1997 (PDF)(333 pp, 18.17 MB, EPA420-R-03-009, July 2003, About PDF)