Gum Rosin – Tricyclic Monocarboxylic Acids 

Product Overview

Gum rosin, scientifically classified as a mixture of tricyclic monocarboxylic acids, is a natural resinous material derived from the oleoresin of pine trees, primarily from Pinus species.

This versatile bio-based product has been valued for centuries across numerous industries and continues to serve as an essential raw material in modern manufacturing processes.

Chemical Composition

Gum rosin consists predominantly of resin acids, which are tricyclic diterpene monocarboxylic acids. The major constituents include:

• Abietic acid and its isomers (levopimaric, palustric, and neoabietic acids) – typically comprising 60-90% of the composition
• Pimaric-type acids (pimaric, isopimaric, and sandaracopimaric acids)
• Neutral compounds – small percentages of non-acidic materials

The molecular structure features a phenanthrene-based tricyclic ring system with a carboxylic acid functional group, giving gum rosin its characteristic properties and reactivity.

Physical Properties

• Appearance: Translucent to amber-colored brittle solid at room temperature
• Softening Point: Typically 70-80°C (158-176°F)
• Acid Number: 160-175 mg KOH/g
• Color Grade: Available in various grades from WG (Water White) to darker grades
• Solubility: Soluble in alcohols, ethers, aromatic hydrocarbons, and most organic solvents; insoluble in water

Key Applications

• Adhesives & Sealants: Gum rosin serves as a tackifier in hot-melt adhesives, pressure-sensitive adhesives, and rubber-based formulations.
• Paper Sizing: Used in paper manufacturing to improve water resistance and printability.
• Inks & Coatings: Functions as a resin component in printing inks, varnishes, and protective coatings.
• Rubber Compounding: Acts as a softener and processing aid in rubber production.
• Chewing Gum: Provides texture and consistency as a food-grade base material.
• Chemical Intermediates: Raw material for producing rosin derivatives including rosin esters, hydrogenated rosins, and disproportionated rosins.

Product Advantages

• Renewable Resource: Sustainably sourced from managed pine forests
• Biodegradable: Environmentally friendly alternative to synthetic resins
• Versatile Chemistry: Easily modified through esterification, hydrogenation, or disproportionation
• Cost-Effective: Competitive pricing compared to petroleum-based alternatives
• Consistent Quality: Available in standardized grades meeting international specifications

Quality Standards

Our gum rosin meets or exceeds international quality standards including GB/T (China), ASTM (USA), and other regional specifications. Each batch undergoes rigorous testing for acid number, softening point, color, and purity to ensure consistent performance.

Packaging & Storage

Available in various packaging options including galvanized Iron drums of 20/200kg. Store in a cool, dry place away from direct sunlight and heat sources to maintain product stability.

For technical specifications, safety data sheets, or to discuss your specific application requirements, please contact our technical support team.