There are many different types and brands of VCI paper in the marketplace.
Many manufacturers use their own branding referring to it as VCI, VPI, VPN, VpCI, VPP, MPI, PW or other acronym to describe their particular brand of the VCI paper. Manufacturers or marketeers will do this in an attempt to "differentiate their product" from those of competitors. In addition to they will often add their own product code numbers or trade names.
As in these two examples: VPI Paper Product Code: VCI-146 OR VCI Paper Product Code: PW-32
Basically all of these catchy buzz words and marketing "spin" mean, or try to convey, the same particular attribute of the corrosion inhibitor (inhibiter) paper. The meaning of the terms are basically the same. This is paper used to wrap or as interleave corrosion protection for metal parts or metal materials to slow down or prevent the natural process of rust and corrosion. The paper is impregnated or coated with a corrosion inhibitor.
This branding or descriptive term has changed several times during the past 50 years probably as the industry tries to re-invent itself or find a unique term to describe the benefits of their products. The current generally accepted terminology used by knowledgeable and experienced companies in North America today is VCI. There are of course a few exceptions where a manufacturer will use their own trade name and then define the product properties.
VCI Translation: Vapor Corrosion Inhibitor or Volatile Corrosion Inhibitor
VPI Translation: Vapor Phase Inhibitor or Vapor Paper Inhibitor
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