What Is Damar Batu?

Damar batu — literally "stone resin" in Indonesian — is a natural oleoresin tapped from Shorea javanica trees in the tropical forests and agroforestry systems of Sumatra. Known internationally as cat eye resin or black dammar, it has been a significant Indonesian export commodity for over a century. Unlike spices, damar batu is a non-food forest product, though high-grade damar is used in food-grade applications as a glazing agent.

Where Does Damar Batu Come From?

Damar batu is harvested primarily in the Lampung and Bengkulu provinces of Sumatra, Indonesia. The resin comes from Shorea javanica trees cultivated in traditional agroforestry systems called repong damar — multi-layered forest gardens that local communities have managed sustainably for generations.

This agroforestry model is notable: the trees are not plantation-grown but integrated into diverse forest gardens alongside coffee, fruit trees, and other species. The harvesting method — making incisions in the bark and collecting hardened resin over several weeks — does not kill or significantly harm the trees, allowing decades of continuous production from individual specimens.

Grades

Damar batu is graded primarily by clarity and purity:

• Grade AB — Clear, large lumps with a pale yellow to amber color. Premium quality suitable for both industrial and food-grade applications. Higher transparency indicates lower impurity content.
• Grade CD — Mixed sizes with darker coloring and more inclusions. Standard grade for industrial use where visual clarity is less important than resin properties.

The "cat eye" nickname comes from the way high-grade damar catches and transmits light, resembling the chatoyancy of cat eye gemstones.

Industrial Applications

Damar batu serves several significant industrial markets:

• Varnish and lacquer — The traditional and still largest use. Damar dissolves readily in turpentine and other solvents to produce clear, hard-drying varnishes. It is favored for its clarity and non-yellowing properties.
• Incense production — Damar is a base ingredient in many incense formulations across South and Southeast Asia, valued for its clean-burning properties and mild, pleasant aroma.
• Paint and coatings — Used as a binder and gloss enhancer in specialty paints and protective coatings.
• Caulking and sealing — Traditional use in boat-building and construction as a waterproof sealant.

Food-Grade Applications

High-purity damar batu (Grade AB, food-specified) is used as:

• Glazing agent — Applied to confectionery, chocolate, and fruit to create a glossy, protective coating. Used in both traditional Indonesian confections and international food manufacturing.
• Batik wax component — Mixed into wax blends used in traditional Javanese batik textile production, where it contributes to the wax resist's adhesion and cracking pattern.

Food-grade damar must meet specific purity standards, including limits on heavy metals and microbial contamination. Our Grade AB damar, when specified for food applications, meets international food safety requirements.

Sustainability

Damar batu harvesting in Sumatra is one of the more genuinely sustainable commodity supply chains in Indonesia. The repong damar agroforestry system maintains forest cover while providing income to local communities. Trees produce resin for decades, and the harvesting process does not require deforestation or destructive extraction.

This sustainability profile is increasingly relevant for buyers in European and North American markets where supply chain traceability and environmental impact are purchasing factors.

Explore our Damar Batu product page for grades, packaging, and export details.