Plastic    is    material    consisting    of    any    of    a    wide    range    of synthetic    or    semi-synthetic    organic    compounds    that    are malleable and so can be molded into solid objects. Plasticity    is    the    general    property    of    all    materials    which    can deform   irreversibly   without   breaking   but,   in   the   class   of   moldable polymers,   this   occurs   to   such   a   degree   that   their   actual   name derives from this ability. Plastics   are   typically   organic   polymers   of   high   molecular mass,   but   they   often   contain   other   substances.   They   are usually       synthetic,       most       commonly       derived       from petrochemicals,     but     many     are     made     from     renewable materials   such   as   polylactic   acid   from   corn   or   cellulosics from cotton linters. Due   to   their   relatively   low   cost,   ease   of   manufacture,   versatility, and   imperviousness   to   water,   plastics   are   used   in   an   enormous and     expanding     range     of     products,     from     paper     clips     to spaceships.    They    have    already    displaced    many    traditional materials,   such   as   wood,   stone,   horn   and   bone,   leather,   paper, metal, glass, and ceramic, in most of their former uses. In    developed    countries,    about    a    third    of    plastic    is    used    in packaging   and   another   third   in   buildings   such   as   piping   used   in plumbing   or   vinyl   siding.   Other   uses   include   automobiles   (up   to 20%   plastic),   furniture,   and   toys.   In   the   developing   world,   the ratios   may   be   different   -   for   example,   reportedly   42%   of   India's consumption is used in packaging. Plastics   have   many   uses   in   the   medical   field   as   well,   to   include polymer    implants,    however    the    field    of    plastic    surgery    is    not named   for   use   of   plastic   materials,   but   rather   the   more   generic meaning   of   the   word   plasticity,   with   regard   to   the   reshaping   of flesh.

Strap   is   a   flexible   flat   material,   most   commonly   made   from steel or various plastics. Steel Strapping    used    on    shipment    of    chemical    weapons    slated    for destruction Softgoods strapped in a bale or bundle Steel   is   the   oldest   and   highest   tensile   strength   strapping.   It   is available   in   a   variety   of   widths   and   thicknesses   as   well   as variations   in   the   grade   of   steel.   Steel   is   used   for   heavy   duty holding    where    high    strength    and    minimal    stretch    are    desired. Surface   finishes   for   steel   strap   include:   paint,   paint   and   wax,   bluing or   zinc   and   wax.   The   wax   is   used   to   better   transmit   the   tension around   the   bundle   and   for   use   with   certain   types   of   tensioners. Common   applications   include   steel   coils,   bundles   of   metal, baling    wire,    bricks    and    pavers,    and    roll    end-binding.    Steel Strapping   is   sold   by   weight   rather   than   length,   due   to   the   natural expansion   and   contraction   of   steel   in   the   manufacturing   process. A 3/4   x   .020   Steel   Strapping   Coil   yields   approximately   19.6   feet   per pound. Polypropylene Polypropylene    strap    (oriented    or    tensilized)    is    an    economical material   designed   for   light   to   medium   duty   unitizing,   palletizing   and bundling.   It   is   available   in   various   widths,   thicknesses,   and   polymer variations    (e.g.,    copolymers).    Most    polypropylene    is    embossed, some   of   which   is   also   printed. This   product   offers   higher   elongation at   break   but   tends   to   have   irrecoverable   dead   stretch   with   constant stress.    What    is    not    generally    known    to    end    users    is    that polypropylene   strapping   will   lose   about   50%   of   the   applied tension    within    one    hour,    and    that    this    tension    loss    is accelerated      with      increases      in      ambient      temperature, consequently   although   suitable   for   packs   with   a   degree   of stored   energy   that   will   take   up   any   relaxtion   that   occurs   in   the strap,   unacceptable   strap   slackness   may   occur   after   time   if used   on   product   that   is   'Solid'   such   as   bricks   or   concrete.   Further more   polypropylene   strapping   is   susceptible   to   UV   degradation and   can   quickly   degrade   if   left   outside   exposed   to   the   elements. The   sensible   choice   of   colour   will   retard   the   process,   such   as specifying black strap. Similarly, a UV inhibitor can be specified. Polypropylene   strapping   may   be   printed,   either   during   production and   pre-embossing   for   the   highest   quality   and   precision,   or   post production   over   the   embossing   for   a   reduced   quality.   Both   offer security and marketing advantages to the strapped product. Polyester Oriented   or   tensilized   polyester   and   nylon   are   the   strongest plastic   strapping   products   and   are   used   as   a   viable   alternative to    steel    strapping    in    some    industries.    Polyester    provides excellent   retained   tension   on   rigid   loads.   Its   excellent   recovery properties help a load absorb impact without strap breakage. There   are   specialized   types   available   for   specific   applications.   For instance,   in   cold   climates   a   strap   bonded   in   hot   melt   glue   is   used because it is weather-proof

TYPES OF STRAP

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