Compliance work

Overall migration Sensory analysis

Material analysis

Mechanical properties

permeation

PPWR/ Recycling

Water vapour transmission rate (WVTR)/ Sd- value (water vapour diffusion-equivalent air layer thickness)

Determination of the Sd value according to the gravimetric method on diffusion open and diffusion inhibiting materials with Sd values of approx. 0.03- 10 m ( equivalent to a WVTR of approx. 4- 800 g/(m²xd) depending on the material and test conditions) as a quintuple determination. For diffusion-inhibiting, diffusion-blocking and diffusion-proof materials with Sd values of approx. 10- >1500 m (corresponds to a WVTR of approx. 0.005- 125 g/(m²xd) depending on the material and test conditions), we recommend the more rapid and more cost-effective electrolysis method (then deviating from the standard as a double determination).

In short — AI-generated

This test determines how much water vapor passes through a packaging material under defined temperature and humidity conditions. Depending on the material's barrier properties, we use either the gravimetric cup method, which measures weight change over time, or the electrolytic method, which uses a sensor to detect moisture transmission.

The resulting Sd-value indicates the thickness of a static air layer that would provide the same resistance to water vapor as the tested material. This value allows developers to compare different films and ensure the packaging provides the necessary moisture protection for the specific product inside.

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

Test Method Group: permeation

Norms:
  • DIN EN 1931 (2001-03) Flexible sheets for waterproofing – Bitumen, plastic and rubber sheets for roof waterproofing – Determination of water vapour transmission properties
  • DIN 53122-1 (2001-08) Testing of plastic and elastomer films, paper, board and other sheet materials – Determination of water vapour transmission – Part 1: Gravimetric method
  • DIN EN ISO 12572 (2025-03) Hygrothermal performance of building materials and products – Determination of water vapour transmission properties – Cup method
  • DIN EN ISO 15106-3 (2005-05) Plastics – Film and sheeting Determination of water vapour transmission rate – Part 3: Electrolytic detection sensor method

Required Sample Amount: optimum: 5 DIN A 4 sheets without folds, creases or other damages

Standard Tests

WVTR/ Sd- value breathable materials

Specific Norm: DIN EN ISO 12572

Determination of the Sd- value (water vapor diffusion equivalent air layer thickness) of building materials and products, which used as permeable (breathing) materials, gravimetric measurement according to DIN EN ISO 12572 / DIN EN 12086 (suitable for Sd-values in the range of approx. 1 - 100 m).

WVTR / Sd value water vapour barrier materials

Specific Norm: DIN EN 1931

Determination of the SD value (water vapor diffusion equivalent air layer thickness) of building materials and products that are used as vapor barrier, electrolytic measurement according to ISO 15106-3 (suitable for Sd-values in the range of approx. 50 - >1500 m).
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