There are thousands of products with individual text blocks but also additional information where some paragraphs stay the same for large groups of products.
and much more. All this information is given as fulltext and not flags, so I can not show some descriptive icons instead.
It total this information may make up to 50% of total page text length (most times less).
Since this information is relevant for many products this produces (onpage) duplicate content. I wonder if there is any best practice to deal with it? Will search engines (esp. google) even punish these pages?
So the best way for me would be to tell google (or other search engines) that this content might be duplicate, but it is necessary for the user to see it on every affected page.