Filling goods specification DIN EN 12934

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Why is a duvet I buy in Italy labelled with the UNI EN 12934? Is that duvet of a different quality?

In the case of a European standard such as the EN 12934 the procedure is as follows: the countries which have cooperated to formulate a European standard transfer the standard into national standard, after its text has been translated into the respective languages. In Germany the standard will then become a DIN standard, in Italy a UNI standard, in Great Britain a BS standard. The content of the standard will, however, not be affected by this.
All products which refer to the European standard EN 12934 must therefore fulfil the same requirements concerning the labelling.

Which are the most important differences between the old RAL 092 A2-regulations, that are not in force any more, and the new standard DIN EN 12934?

The most important and the most obvious difference is related to the information on the filling’s massshares of down and feathers which are specified in per cent. The percentage of down plays an important role in this: the higher the down content, the higher the filling power and the thermal retention of the product with – at the same time – a lower weight.
 
The down and feather shares are not indicated anymore by a narrative text, at least not without the obligatory composition labelling expressed in percentages.

To whom does the labelling standard EN 12934 apply ?

Basically, the manufacturers are free to label their products in accordance with the European standard. A standard like EN 12934 is a non-binding recommendation. However, if manufacturers label their products in accordance with the standard, they will be responsible that their goods actually comply with the standard. Hence, for instance the percentages (down percentage, feather percentage) shall be labelled correctly. De facto, however, labelling in accordance with the European standard is the rule.