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What should be the size of the certified reflector?

There are lots of requirements for the producer to fulfill to get the EN13356:2001 certificate (only producers can get the certificate, not distributors). The first thing on the certificate is the allowed minimum and maximum size for the product. Note that this is very important issue as the reflective materials have different quality so producers get different requirements for the product size. The total minimum reflectivity for the certified product is 15cm2, maximum 50cm2. There are only 2 material producers in the world who have such a good quality that they get so small minimum, these producers are 3M Scotchlite and Reflexite . Other material producers have higher minimum which can be even 26cm2 (almost twice as big as for 15cm2).