Opacity measurement

The measurements are carried out using a spectrophotometer according to ISO 2471 or DIN 6125. An opacity card (Leneta) type 2 a serves as a black and white base according to DIN 6125.

In short — AI-generated

The opacity measurement determines the light-blocking capability of a packaging film. During the test, the film is placed over a standardized black-and-white background, and a spectrophotometer measures the difference in light reflectance to calculate the degree of opacity.

The resulting value indicates how much light passes through the material, which is essential for protecting light-sensitive products. In practice, this measurement helps developers ensure that printed designs do not show through the film and that the packaging provides the required level of visual privacy.

Text is AI-generated; based on test method data curated and verified by Innoform.

Test Method Group: optical tests

Norms:

DIN 6125 (2021-10) Packaging test – Opaque and/or white pigmented films – Determination of opacity
ISO 2471 (2008-12) Paper and board - Determination of opacity (paper backing) - Diffuse reflectance method

Required Sample Amount: 5 x DIN A 4

Standard Tests

Opacity, opaque and/or white pigmented films

Specific Norm: DIN 6125

Method using diffuse reflection, with Leneta opacity card as background. By default, measurements are performed with standard light type D65 under gloss inclusion (SCI). On request, measurements with standard light type D 50 and/or under gloss exclusion (SCE) are also possible.

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Opacity, paper and cardboard

Specific Norm: ISO 2471

Method using diffuse reflection. Ro is measured against a black hollow body, R∞ is measured against a lightproof material stack. By default, measurements are performed with standard light type D65 under gloss inclusion (SCI). On request, measurements with standard light type D 50 and/or under gloss exclusion (SCE) are also possible.

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