Sealant is a substance used to block the passage of
fluids through the surface or joints or openings in materials, a type of
mechanical seal. In building construction
sealant is sometimes synonymous with
caulking and also serve the purposes of blocking dust, sound and heat transmission. Sealants may be weak or strong, flexible or rigid, permanent or temporary. Sealants are not
adhesives but some have adhesive qualities and are called
adhesive-sealants or
structural sealants.