These high quality gray chlorobutyl stoppers are used for research and pharmaceutical packaging applications.

• Formulation contains no plasticizers, 2-mercapto-benzothaizole, nitrosamine precursors or natural rubber latex
• Formulation is applicable to aqueous solutions with a pH range of 2 to 10
• Durometer 50
• Universal gray chlorobutyl formulation passes Japanese, European and United States pharmacopeia testing for globally marketed pharmaceutical products

*Is rinsed with a silicon oil to provide increased lubricity.