4.2 Material

The vessels shall be sufficiently robust to withstand normal usage without distortions.

For capacity serving measures and measuring container bottles, the materials used in construction should be sufficiently tough, rigid, non porous and stable to maintain accuracy during use.

Casks may be manufactured in any material with strength, rigidity and toughness adequate for the intended use (e.g. solid wood, plywood, metal). National regulations may stipulate that the interior of certain casks must be covered with a protective permanent coating, compatible with the material used for construction and the liquids to be contained.

Vessels used only once, such as thin plastic or cardboard drinking capacities, must remain accurate during nominal filling, transportation and discharge functions.