Rosin is light yellow to yellow transparent solid red, softening point 70 ~ 90 ℃, the proportion of 1.070 ~ 1.085, solution heat: 15.8 kcal/kg, the heat capacity: 0.54 kcal/kg ℃, coefficient of thermal conductivity: 0.11 kcal/m. h. ℃, volume resistivity, 5 x 1016 Ω cm, flash point: 216 ℃. Rosin crystallization characteristics, also easy to produce crystalline phenomenon, can have the crystallization trend in organic solvents such as acetone, the critical temperature about 100 ℃, rosin crystallization melting point of 110 ~ 135 ℃, and difficult to saponification. In addition, rosin with optical activity, rosin than spin control value between 0 ~ 15 ° (best point + 7 °) is the lowest no crystallization and crystallization trend of rosin.
Rosin is a pine tree trunks internal flow of oil by high temperature melting into water, after hard into block solid (no fixed melting point), the color brown red, is an important chemical raw materials, mainly used in daily life time of circuit board welding flux, rosin in instrument be blotted out in erhu, bass, Mongol stringed instrument, such as string the bow hair to increase on the bow hair friction of the strings.