Dammar, also called dammar gum, or damar gum, is a

resin In polymer chemistry and materials science, resin is a solid or highly viscous substance of plant or synthetic origin that is typically convertible into polymers. Resins are usually mixtures of organic compounds. This article focuses on nat ...

obtained from the tree family

Dipterocarpaceae Dipterocarpaceae is a family of 16 genera and about 695 known species of mainly tropical lowland rainforest trees. The family name, from the type genus ''Dipterocarpus'', is derived from Greek (''di'' = two, ''pteron'' = wing and ''karpos'' = fru ...

India India, officially the Republic of India (Hindi: ), is a country in South Asia. It is the List of countries and dependencies by area, seventh-largest country by area, the List of countries and dependencies by population, second-most populous ...

and

Southeast Asia Southeast Asia, also spelled South East Asia and South-East Asia, and also known as Southeastern Asia, South-eastern Asia or SEA, is the geographical south-eastern region of Asia, consisting of the regions that are situated south of mainland ...

, principally those of the

genera Genus ( plural genera ) is a taxonomic rank used in the biological classification of living and fossil organisms as well as viruses. In the hierarchy of biological classification, genus comes above species and below family. In binomial nomenclat ...

'' Shorea'' or '' Hopea'' (synonym ''Balanocarpus''). The resin of some species of ''

Canarium ''Canarium'' is a genus of about 100 species of tropical and subtropical trees, in the family Burseraceae. They grow naturally across tropical Africa, south and southeast Asia, Indochina, Malesia, Australia and western Pacific Islands; includi ...

'' may also called dammar. Most is produced by tapping trees; however, some is collected in

fossil A fossil (from Classical Latin , ) is any preserved remains, impression, or trace of any once-living thing from a past geological age. Examples include bones, shells, exoskeletons, stone imprints of animals or microbes, objects preserved ...

ised form on the ground. The gum varies in colour from clear to pale yellow, while the fossilised form is grey-brown. Dammar gum is a

triterpenoid Triterpenes are a class of chemical compounds composed of three terpene units with the molecular formula C30H48; they may also be thought of as consisting of six isoprene units. Animals, plants and fungi all produce triterpenes, including squal ...

resin, containing many

triterpene Triterpenes are a class of chemical compounds composed of three terpene units with the molecular formula C30H48; they may also be thought of as consisting of six isoprene units. Animals, plants and fungi all produce triterpenes, including squa ...

s and their oxidation products. Many of them are low molecular weight compounds (

dammarane Dammarane is a tetracyclic triterpene found in sapogenins (forming triterpenoid saponins) like those of ginseng (ginsenoside Ginsenosides or panaxosides are a class of natural product steroid glycosides and triterpene saponins. Compounds in t ...

, dammarenolic acid, oleanane, oleanonic acid, etc.), but dammar also contains a polymeric fraction, composed of polycadinene. The name ''dammar'' is a Malay word meaning ‘resin’ or ‘torch made from resin’.

Types

* ''Damar mata kucing'' (‘cat's eye damar’) is a crystalline resin, usually in the form of round balls. ''

Shorea javanica Fruit of a ''Shorea'' species ''Shorea'' is a genus of about 196 species of mainly rainforest trees in the family Dipterocarpaceae. The genus is named after Sir John Shore, the governor-general of the British East India Company, 1793–1798. Th ...

'' is an important source in Indonesia. * ''Damar batu'' (‘stone damar’) is stone or pebble-shaped,

opaque Opacity or opaque may refer to: * Impediments to (especially, visible) light: ** Opacities, absorption coefficients ** Opacity (optics), property or degree of blocking the transmission of light * Metaphors derived from literal optics: ** In lingui ...

dammar collected from the ground. * ''Damar hitam'' (‘black damar’)

Uses

*''Dammar varnish'', made from dammar gum dissolved in

turpentine Turpentine (which is also called spirit of turpentine, oil of turpentine, terebenthene, terebinthine and (colloquially) turps) is a fluid obtained by the distillation of resin harvested from living trees, mainly pines. Mainly used as a special ...

, was introduced as a picture

varnish Varnish is a clear transparent hard protective coating or film. It is not a stain. It usually has a yellowish shade from the manufacturing process and materials used, but it may also be pigmented as desired, and is sold commercially in variou ...

in 1826; commonly used in

oil painting Oil painting is the process of painting with pigments with a medium of drying oil as the binder. It has been the most common technique for artistic painting on wood panel or canvas for several centuries, spreading from Europe to the rest ...

, both during the painting process and after the painting is finished. Dammar varnish and similar gum varnishes auto-oxidize and yellow over a relatively short time regardless of storage method; this effect is more pronounced on paintings stored in darkness than with works on display in light due to the bleaching effects of sunlight on the colorants involved. *

Batik Batik is an Indonesian technique of wax-resist dyeing applied to the whole cloth. This technique originated from the island of Java, Indonesia. Batik is made either by drawing dots and lines of the resist with a spouted tool called a ''ca ...

is made from dammar crystals dissolved in molten

paraffin wax Paraffin wax (or petroleum wax) is a soft colorless solid derived from petroleum, coal, or oil shale that consists of a mixture of hydrocarbon molecules containing between 20 and 40 carbon atoms. It is solid at room temperature and begins t ...

, to prevent the wax from cracking when it is drawn onto silk or rayon. * Encaustic Paints are made from dammar crystals in beeswax with pigment added. The dammar crystals serve as a hardening agent. *As caulk for ships in the past, frequently with pitch or bitumen. *As a common mounting material along with canada balsam for preparing biological samples for

light microscopy Microscopy is the technical field of using microscopes to view objects and areas of objects that cannot be seen with the naked eye (objects that are not within the resolution range of the normal eye). There are three well-known branches of micr ...

. *Used in Ayurvedic medicine for various conditions.

Constituent Compounds

Fresh dammar gum consists of a mixture of compounds; primarily Hydroxydammarenone, Dammarenolic acid, and Oleanonic aldehyde.

Material safety

Physical data

* Appearance: white powder *

Melting point The melting point (or, rarely, liquefaction point) of a substance is the temperature at which it changes state from solid to liquid. At the melting point the solid and liquid phase exist in equilibrium. The melting point of a substance depen ...

: approx. 120 °C *

Density Density (volumetric mass density or specific mass) is the substance's mass per unit of volume. The symbol most often used for density is ''ρ'' (the lower case Greek letter rho), although the Latin letter ''D'' can also be used. Mathematicall ...

: 1.04 to 1.12 g/ml *

Refractive index In optics, the refractive index (or refraction index) of an optical medium is a dimensionless number that gives the indication of the light bending ability of that medium. The refractive index determines how much the path of light is bent, ...

: approx. 1.5 * CAS number: 9000-16-2 * EINECS: 232-528-4 * Harmonised Tariff: 1301-90

Stability and toxicity

The gum is stable, probably combustible and incompatible with strong oxidising agents. Its toxicity is low, but inhalation of dust may cause allergies.

Types

Uses

Constituent Compounds

Material safety

Physical data

Stability and toxicity

See also

References

Further reading