Wrapping material

In an elongated wrapper which is initially flexible and which when wrapped around one or more bodies is adapted to be stretched and to assume a substantially rigid condition, outer, elongated, tubular, impermeable, elastic envelope means having in a transverse direction a width which is a relatively small fraction of its length in a longitudinal direction and having a generally flat cross sectional configuration for surrounding one or more bodies while being stretched in said longitudinal direction and wrapped around the bodies, said envelope means having an inner surface carrying one of a pair of materials which when they combine react to assume a hardened condition, said one material being distributed in said longitudinal direction along said inner surface of said envelope means and the other of said materials being situated in the interior of said envelope means between opposed wall portions thereof which extend in said longitudinal direction, and separating means situated in the interior of said envelope means between said materials and separating the latter from each other for preventing them from combining with each other, said separating means including an apertured layer of sheet material and a covering sheet material which is relatively brittle and which has the property of rupturing in response to stretching of said envelope means in said longitudinal direction when said envelope means is wrapped around one or more of said bodies, said covering sheet material being adhered to and covering said apertured sheet material to close the apertures thereof so that upon rupturing of said covering sheet material in response to said longitudinal stretching of said envelope means, said separating means will assume a non-separating condition placing said materials in contact with each other through apertures of said apertured sheet material so that they will combine to assume said hardened condition in response to stretching of said envelope means in said longitudinal direction and wrapping of said envelope means around one or more bodies, said envelope means and separating means both being transparent while said pair of materials include a material which initially is non-transparent but which becomes transparent when said pair of materials combine with each other, so that the transparency resulting from the combining of said pair of materials gives a visual indication of the hardening reaction and renders visible that part of a body which is covered by the wrapper.