I would say it depends on the length of your product descriptions. If your guarantees etc are like 50-100 words and your product description is 200 words, Google most likely wont consider those pages for duplicates.
However, you can help Google to figure out the context, so if you place your guarantees within a box in the aside-tag or similar, Google will most likely "guess" your website structure and consider your guarantees a static element like your navigation, footer etc.