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This Knowledge Article explains the different B2-coating codes in relation to the area of the closure that had been sprayed with B2-coating.
B2-coating is a combination of high molecular weight silicones. It is a cross-linkable polydimethylsiloxane which is applied by spray, then heated and UV cured to the surface of elastomeric closures. In comparison to free silicone oil, the B2-coating greatly reduces subvisible particulate levels while enhancing closure machinability.
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