How Does VCI Paper Work for Castings, Bearings and Forging Blanks?
VCI paper is kraft or specialty paper impregnated or coated with volatile corrosion inhibitors. When you wrap a machined casting, interleave bearing faces or layer forging blanks and keep the pack closed, inhibitor molecules vapourise into the air space, settle on metal and form a thin molecular layer. That layer interrupts corrosion driven by moisture, oxygen and shop contaminants. When you unwrap for the next grind or OEM step, the vapour leaves. Parts stay dry and clean. No greasy oil to remove from raceways or casting faces.
Established foundry VCI guidance emphasises WIP protection after machining and oil replacement where cleanliness matters. Crepe kraft grades suit irregular castings and forgings because the sheet stretches like a bandage without tearing at corners, and clean, contaminant-free metal before wrap plus a sealed enclosure both extend protection life. On the Saurashtra belt those points decide whether Metoda castings and Shapar forged blanks survive monsoon warehouse weeks and Mundra carton dwell without flash rust.
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