There is a wide range of synthetic polymeric adhesives and they can be subdivided into many groups, including pressure sensitive, contact, structural, and hot melt. The properties of these adhesives vary greatly and this is why they have such wide-ranging applications, from those that need to be strong and reliable enough for a space shuttle fuel tank, to those that must stick and peel like the glue on a post-it note. Sealants are very similar to adhesives in that they must bond well to varying materials, but are mainly used to coat materials to protect them in some way, particularly in potential weak spots. The wide variety of types of adhesives and sealants and their many applications result in consistently high levels of research.
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