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Which of the following metal is not used in vacuum metallization?

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in Food Packaging Technology by (63.0k points)
Which of the following metal is not used in vacuum metallization?

(a) Aluminium

(b) Nickel

(c) Chromium

(d) Sodium

The question was posed to me during an online interview.

The origin of the question is Blending and Vapor Deposition in Thermoplastics topic in chapter Thermoplastic Polymers Properties & Processing of Food Packaging Technology

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Correct option is (d) Sodium

Easy explanation: Sodium is not used in metallization. Vacuum metallization is a method in physical vapour deposition process and produces coatings by thermal evaporation of metals in a vacuum. Physical method includes vaporization of the metal, which is later deposited on the surface by condensation.

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