The rubber closures are usually washed by mechanical agitation in a tank of hot detergent solution (such as 0.5% sodium pyrophosphate) followed by a series of through water rinses, the final rinse being WFI. The objective is to remove the surface debris accumulated from the molding operation and from handling and leachable constituents at or near the surface. Part of the debris is attached and held on the surface by electrostatic forces. Similarly, plastic materials accumulate surface debris.
The multiple objectives for washing closures and other parts include loosening debris, minimizing abrasion and sweeping away the loosened debris.
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