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Is an opaque film the same as blockout film?

Understand the difference between opaque and blockout films in graphic applications, including how each affects show-through, light transmission, and covering existing graphics.

Not necessarily. A film classified as opaque and a blockout film are related but not exactly the same.

Blockout is a term used for films used in backlit applications where one wants to achieve a different night look (backlit) vs. day look (frontlit). An opaque film is for films meant for closed-back (non-backlit) applications.

Opaque Film

An opaque film is designed to reduce show-through of the substrate or previous graphics.

  • It contains pigments in the film or adhesive to limit light transmission.

  • It helps hide color differences underneath (i.e. dark painted surface or stripes).

  • Some light or shadowing may still show through, especially under strong backlighting or when applied over a high-contrast graphic or surface coating.

Blockout Film

A blockout film is specifically engineered to completely block light transmission.

  • It usually contains a black or gray blockout layer within the construction.

  • It prevents any underlying graphics, colors, or light sources from showing through.

  • Common uses include:

    • Double-sided window graphics

    • Covering old signage

    • Applications where 100% opacity is critical