Application of Gum Rosin

Application of Gum Rosin

Gum Rosin is a natural solid form of pine oleoresin from pine trees, according to the specification, the range of colors from yellow to black, so it was also called colophony. It is a crude raw material used on industrial, on the ordinary application, such as paper making, soap, lubrication oil for stringed instruments. But we can see the demonstrable weakness, such as the dark color, high acid value, or chemical structural instability.

For the refined preparation process of coatings, inks, adhesive and agriculture. Modification of gum rosin is the research trend on market.

Color Slight Yellow Light Yellow Deep Yellow
Softening Point, R&B, °C 75 min 76 min 75 min
Acid Value, mgKOH/g 165 min 166 min 165 min
Ash, % 0.04 max 0.03 max 0.04 max
Insoluble in alcohol, % 0.03 max 0.03 max 0.03 max
Unsaponifiable matter, % 5 max 5 max 5 max


Rosin mainly is used as the concrete frothing agent and floor tiling adhesive.

Rosin was widely used as an ingredient of some kind of adhesive; especially in heat melt adhesive, pressure sensitive adhesive and rubber adhesive. Rosin mainly is used for enhancing the strength, elasticity, and viscosity of adhesive.

Gum Rosin can be used as coating material for release control fertilizer.

Rosin can be converted into abietylamine acetate for killing algae, bacteria, mildew, mollusk and others pest.

Rosin is used as insulation material in electric equipment industry; China has a long history of applying rosin as insulation material in the cable industry. Rosin also can mix with bakelite and others artificial resin to soak and besmear electric loop.

Abietic acid is the main ingredient of rosin, it can be synthesized with others matter to produce series optics reactive materials and biotic reactive materials; these materials have the special function for human and others organism.

Rosin firstly converted into hydrogenated rosin and then used to produce chewing gum.

Rosin mainly is used as solding aid and metal polishing agent. Rosin is a kind of weak acidity matter, it can remove oxidation film from the metal surface and slightly erode the surface of the metal, and therefore, lots of solding aid agents contain rosin.

Rosin is a basic material for paint industry because rosin is easy to dissolve in alcohol, gasoline, turpentine, and others organic solvent. Rosin always is converted to resonate, and then refine with drying oil such as tung oil and mix with volatility solvent to produce various lacquers. Rosin also take an important role in producing road coating, rosin firstly converted to rosin malefic ester or polymerized rosin or disproportionated rosin Polyols ester, and then used to make the thermoplastic coating for road sign injunction.

Most rosins were applied to papermaking industry as the sizing agent. Rosin paper sizing agent can prevent printing oil soaking and be dispersing from paper, improves the strength and smoothness of paper; enhances the anti-abrasion of paper. But crystal rosin is unfit for making paper sizing agent due to the difficulty of saponification, subsequently makes the spot on the paper; sometimes even makes the pipe jam in paper sizing agent producing.

Rosin is the ingredient of depilatory wax. It’s the traditional formula that effectively removes unwanted hair, and formulated for each skin and hair type.

Rosin always replaces a part of grease to produce soap because rosin has a similar character with fatty acid and cheaper than the fatty acid, but the consumption decline gradually in recent years.

Rosin is used as the softener in synthetic rubber industry; it enhances the plasticity, tears strength, heat resistance, flexibility and anti-abrasion of synthetic rubber; also rosin can be used as dispersant and emulsification in the synthetic rubber industry. After the seventies of twenty century, about 20% of the total annual output of rosin was used in synthetic rubber industry.