These caps are known for providing the widest range of chemical compatibility and for being the most temperature tolerant of plastic closures. They also provide the most consistent adherence to close dimensional tolerances. Ideal for pharmaceutical applications.These caps offer good chemical resistance and are typically used with solids and powders. They offer good resistance to hydro-carbons, alcohols, ketones and oils. Not recommended for acids and alkalis. Case includes 48 bags of 12 caps each.