Rubberwood typically ranks around 660 on the Janka hardness scale. This places it in the medium range of hardwoods, making it suitable for a variety of furniture and flooring applications. Its moderate hardness allows for ease of processing while still providing durability. Additionally, rubberwood is often considered an eco-friendly option, as it utilizes trees that are no longer productive for latex.
The Janka Hardness Scale rates the hardness of hardwood flooring and bamboo as well. You can read more about the Janka Scale and see a list of the Janka Hardness Ratings from FindAnyFloor here http://www.findanyfloor.com/hardwood/JankaHardnessRatings.xhtml
According to the Janka Hardness Scale Acacia rates at 1750 lbs in a sq inch.
European Oak in many ways in similar on the Janka scale as Ameriacan Oak at 1360.
Poplar has a rating of 540.
One can buy rubberwood online on different websites. Some of the useful websites for purchase of rubberwood are Lumber Jocks, Garden Web and Rubberwood Products.
The Janka hardness scale measures the resistance of a wood species to wear and denting. However, the blackthorn (Prunus spinosa) is not commonly listed on the Janka hardness scale due to its limited use in commercial applications. In general, blackthorn is known to be a very hard and dense wood, similar to other fruitwoods like cherry and plum, which typically have Janka hardness values ranging from 950 to 1200 pounds-force.
Rubberwood is as good a material for making furniture as regular wood. Rubberwood is imported from the Far East, and after it has been kiln dried, it resists absorbing water.
White Oak is 1360 Northern Red Oak is 1290
Rubber tree wood is relatively soft and falls on the lower end of the Janka Wood Hardness Scale. Its hardness varies depending on the specific species of rubber tree, but it is typically in the range of 600-900 lbf (pounds-force).
700kg/m3
http://surfpick.com/hardness/ This has all the answers
Janka Bryl died in 2006.