Gum rosin also called colophony, is a solid form of resin obtained from pines and some other plants, mostly conifers, produced by heating fresh liquid resin to vaporize the volatile liquid terpene components. It is semi-transparent and varies in color from yellow to black. At room temperature rosin is brittle, but it melts at stove-top temperatures. It chiefly consists of different resin acids, especially abietic acid.
Gum rosin is an important raw material for the manufacture of adhesive, coating, inks, rubber, soaps, paper etc.
|
Parameter |
Grade |
Standard: GB/T8145-8146-2003 |
X |
WW |
WG |
APPEARANCE |
Transparent |
Transparent |
Transparent |
COLOR |
Light Yellow |
Pale Yellow |
Yellow |
SOFTENING POINT(R&B)°C |
76.0 |
76.0 |
75.0 |
ACID NUMBER(mg KOH / g)≥ |
166.0 |
166.0 |
165.0 |
UNSAPONIFIABLE MATTER % ≤ |
5.0 |
5.0 |
5.0 |
ETHANOL INSOLUBLES % ≤ |
0.030 |
0.030 |
0.030 |
ASH CONTENT % ≤ |
0.020 |
0.020 |
0.030 |
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