Rosin also known as colophony or rosin and is a natural organic resin that is
obtained from plants, mostly pines and other conifers, when the fresh liquid
resin obtained from these plants, is heated and the volatile liquid terpene
components are vaporised. Gum rosin mostly contains different resin acids,
especially abietic acid. Gum Rosin is naturally found in Indonesia, South China
and North Vietnam. It is generally semi-transparent or translucent. The
Indonesian Gum rosin is yellowish, while generally gum rosins vary in colour,
from pale yellow to black. It is a solid and vitreous, is brittle at room
temperature and melts at higher temperatures and is insoluble in water and
soluble in organic solvents. It also has a faint piny odour
Rosin is produced from the crude pine resin collected from pine trees. The
resin is subjected to distillation and the distillation process is carried out
in large copper stills. The volatile liquid terpene components separate from
the mixture, as it vaporizes at a temperature between 100 to 160⁰C,
leaving behind fluid rosin as the distillate. This fluid rosin is collected
from below and purified by passing it through straining wadding. The condensate
left behind is called turpentine oil.
rosin is used in rubber industry as a softening agent. It increases the
elasticity of rubber, enabling easy kneading and extrusion. It is also used as
an emulsifier in production of various kinds of synthetic rubber like SBR, ABR
and chloroperene rubber.
is used in the manufacturing of paper for paper sizing, improving the strength
of the paper and its smoothness.
rosin is added to adhesives as a binder. They are generally used in rubber-based
adhesive processing, hot-melt adhesive processing and pressure-sensitive
is used in oil paints as Gum Rosin can easily be softened and oxidised. It is
also present in varnishes. It is present in varnishes.
Rosin is used for tablet film and enteric coating as it has excellent film forming
and coating properties. It is used for formulating microcapsules and
nanoparticles. Its esters are used in chewing gums for medicinal applications.
who use string instruments rub gum rosin on their bow strings for the strings
to vibrate clearly. In archery, gum rosin is present in the wax that is applied
to the bowstring for maintenance purposes. Ballet dancers, boxers, gymnasts and
rock climbers apply gum rosin to the tips and heels of their shoes to reduce
rosin is added to printing inks and as a ingredient in laser printing paper. It
is also used in thermoplastic coatings and for sealing wax.