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Parawood = Rubberwood material
Parawood (rubberwood) material in Thailand and Asia is a good furniture building material, offering great physical and working properties.
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Rubberwood (called Parawood in Thailand) is a common name of the Hevea Brasiliensis. Information about Parawood can be traced back to the time of Christopher Columbus. While on his second visit to South America, he was very interested to find more information about the black heavy ball, that the natives were using for their games. The ball was actually made from the latex produced by the parawood tree. At later dates, historians will also remark the substance, which bounced so good when thrown at the ground, that appeared to be alive. In the 19th century, some of the parawood seeds were transported to England for germination. Once the seeds germinated, the small plants were transported back to the Malaysia for planting and the start of the large Rubber Plantations of Asia. Rubber plantations have existed for hundreds of years in tropical countries like Thailand. These plantations have been used mainly for the production of latex. After the economic life of the rubber tree, which is generally 26- 30 years, the latex yields become extremely low and the planters then cut the rubber trees and plant new ones in their place. This is an example of man's ability to fully utilize our natural resources, without harming the environment compared to other trees, which are cut for the sole purpose of building materials. This eco-friendly Rubberwood (Hevea Brasiliensis) is an excellent timber to use and has various valuable attributes like grain density and shrinkage characteristics.
Color: The usual parawood color is pale cream to yellowish brown, but it can take variety of finishes and tones. The oxidative discoloration is limited by rapid production sequence and vacuum drying.
Grain Pattern: Mostly straight. A cross section of Rubberwood shows few concentric markings reminiscent of growth rings. These markings combined with the large vessels in structure give an attractive appearance with clear patterns on the longitudinal surface.
Structure: Uniform in structure with an excellent 'Timber' feel.
Physical Properties of the Parawood
Green Density------ 800 kg/m³
Relative Density---- 0.63–0.66 (moderately heavy timber)
Volume Shrinkage is negligible and comparable to Dark Red Meranti - Tangential 1.4%, Radial 1%
Strength Group---S7 unseasoned, SD7 seasoned
Bending Strength (Modulus of Rupture) - 66 N/mm²
Compression Strength (Parallel to Grain), (Perpendicular to Grain) - 32 N/mm², 4.69 N/mm²
Modulus of Elasticity- 9240 N/mm²
Working Properties of the Parawood
Durability Resistant to many fungal, bacterial and mould attacks can also be made resistant to other specific susceptibilities. Gluing Good and compatible with almost all industrial grade adhesives--its glue bond strength is high. Machining Easy to saw, machine, plane, turn and bore. The resultant surfaces are fairly smooth Nail holding.
The parawood materials and particles used in building furniture in Thailand and Malaysia are well dried, which quarantees the success and the quality of the furniture pieces. The Parawood tree, once it is cut is left to dry in the sun on the plantations, while the new trees are planted. Once the trees are collected, they are brought for processing in the factory, after which they are stored for the next drying process of 1-2 months before they will be used for the furniture models.
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