RT Journal Article SR Electronic T1 Glass and Rubber Closure Effects on the pH of Water l.A Preliminary Investigation JF PDA Journal of Pharmaceutical Science and Technology JO PDA J Pharm Sci Technol FD Parenteral Drug Association (PDA) SP 11 OP 17 VO 38 IS 1 A1 Preston, Wendy A. A1 Neil R., Anderson YR 1984 UL http://journal.pda.org/content/38/1/11.abstract AB Water packaged in three different types of 10-ml serum vials and sealed with a butyl rubber closure was exposed to extended steam autoclave cycles and high temperature storage. The results of the tests show a reduction in pH values and an increase in a UV absorbance that is dependent on time and temperature. The final pH of the water after storage may be the result of an interaction between glass and rubber extractives.