- International Plywood and Veneer Prices
- China imposes 10% export tax on hardwood flooring
- China launches green procurement policy
- China has become a major importer of US hardwoods
- China abolishes/reduces export for wood products
- Adjusting and Improving Excise Tax Policies
- China regulates export tariff rebate rate
- Characteristics
- Maintenance
- what is the difference between solid and engineered wooden flooring?
- Recycled Wood Flooring
- Installation
- Warranty
- FAQ
- Wood Floors
- Why hardwood?
- Production Procedures
- Engineered Wood Flooring will dominate market
- China’s lamellas industry expands rapidly
- Teak logs sustains robust demand
- International Janka Hardness
- Wood floor
- How to Make a Wood Floor Cleaner
- Installing a wood floor
- Wood Floor Decoration
- How to Make a Wood Floor Cleaner
- Painting a Wood Floor
- Make Your Wood Flooring Scratch-Free
- How To Find The Perfect Hardwood Flooring Solution For Your Home
- Wood Flooring Guide
- Hardwood Flooring Review
- Wood Flooring
- Something about wooden flooring
- Beautiful Wood Floors
- Wood Flooring Repair
- How to lay a wooden floor
- How to Buy Hardwood Flooring
- Buying Wood Flooring
- Decorating Hardwood Floor
- Magnificent wood flooring, in harmony with the environment.
- Exotic wood flooring
- Types of Wood Flooring
- Hardwood flooring
- Fun with Flooring Ideas
- The Basics of a Wood Floor Installation
- How To Sand Your Wood Floor
- Pure Wood Floor
- WALNUT WOOD FLOORING
- Wooden floors durable and easy to look after
- Wood flooring and dogs
- Strong engineered flooring
- Bamboo Is A Type of Grass
- Engineered Flooring market
- The best wood flooring
- Types of wood parquet
- Wood parquet nowadays
- Some common pitfalls of wood flooring
- Inexpensive and good quality
- Real wood flooring
- Flooring level
- China wood flooring
- Wood flooring development in China
- The life of bamboo flooring
- The choice of wood flooring
- Different kind of wood flooring
- The buying guide of engineered flooring
- Something about wear-resisting
- After water absorption expansion rate
- Environmental performance
- Bamboo flooring subject
- Life with bamboo flooring
- Different wood flooring
- Strong point of bamboo flooring
- Bamboo flooring chromatism
- White wood flooring suggest match grey wood flooring
- Engineered Flooring Can Be Sanded
- Construction of Engineered Flooring
- Engineered Flooring Looks As Good As Solid Wood
- The advantages of engineered flooring
- Engineered hardwood flooring is popular
- Maintaining engineered flooring
- The wood flooring deformation or surface cracked
- Wood flooring means fashion
- Keep indoor dry humidity
- Should be correct clean bamboo flooring
- To avoid damage to the bamboo flooring surface
- To avoid damage to the bamboo flooring surface
- Common sense of bamboo flooring
- The renovation of real wood flooring
- The other aspect renovation of wood flooring
- Winter in decorating with wood flooring
- Choosing wood flooring
- Skirting board to create different effects
- Density of wood flooring
- Is engineered flooring water resistant?
- Keep engineered flooring clean
- Cleaning the engineered flooring
- Take care of engineered flooring
- Something about bamboo flooring
- Gas under the wood flooring
- Mat and wood flooring
- What is Engineered Flooring?
- Engineered Thickness
- More Stable Than Traditional Hardwood
- Cleaning when oily be soiled
- Maintain real wood flooring
- Ventilation is necessary
- Movement wood flooring
- Environmental performance of the wood flooring
- Prevention is better before bamboo flooring problems occour
- Manufacturing Problems in bamboo flooring
- Maintenance about bamboo flooring
- Moisture and Finishing
- The key to maintain bamboo flooring
- Bamboo Flooring and Advantages
- Bamboo flooring with good characters
- Skills to choose engineered flooring
- Wood oil
- Experts suggest about flooring maintenance
- Clean the dust on wood flooring
- Flooring cleaner
- Floor waxing
- Use water to clean
- Use vacuum cleaner
- Other requirement about engineered flooring
- Three layers of engineered flooring
- Sunlight and rain VS wood flooring
- Oil and water
- The key to keep engineered flooring
- The engineered flooring valuable
- Install wood flooring
- The wood flooring cleaning should avoid the humidity
- Real wood flooring is popular
- Wood flooring sales well
- States of Chinese wood flooring
- Knowning bamboo flooring
- Environmental Benefits- bamboo flooring
- Feedback about bamboo flooring
- Test samples of bamboo yourself
- When the store change the floor
- Bamboo flooring quality
- Good value for hardwood flooring
- Important player as bamboo flooring
- Bamboo flooring so popular now
- Play the wax for wood flooring
- Inspection for wood flooring
- The process of decorating
- Something about flooring
- They are not alike
- Engineered flooring is Green
- Three categories cleaning work
- A star in the floor
- Good points about flooring
- Bamboo flooring good for environment
List
International Janka Hardness
Model: Janka Hardness | Date:2010-05-13A measure of the hardness of wood, produced by a variation on the Brinell hardness test. The test measures the force required to push a steel ball with a diameter of 11.28 millimeters (0.444 inches) into the wood to a depth of half the ball's diameter (the diameter was chosen to produce a circle with an area of 100 square millimeters). In Janka's original test. the results were expressed in units of pressure, but when the ASTM standardized the test(tentative issue in 1922, standard first formally adopted in 1927), it called for results in units of force.
The results are stated in various ways in different countries, which can lead to confusion, especially since the name of the actual units employed is often not attached. In the United States, the measurement is in pounds-force. In Sweden it is apparently in kilogram-force (kgf), and in Australia, Janka hardness ratings are either in newtons (N) or kilonewtons (kN). Sometimes the results are treated as units, e.g., “360 janka.”
The hardness of wood usually varies with the direction of the grain. If testing is done on the surface of a plank, with the force exerted perpendicular to the grain, the test is said to be of “side hardness.” Side hardnesses of a block of wood measured in the direction of the tree's center (radially) and on a tangent to the tree's rings (tangentially) are typically very similar. End testing is also sometimes done (that is, testing the cut surface of a stump would be a test of end hardness). The side hardness of teak, for example, is in the range 3730 to 4800 newtons, while the end hardness is in the range 4150 to 4500 newtons.
The most common use of Janka hardness ratings is to determine whether a species is suitable for use as flooring.
|
English name |
Latin name |
side hardness/ Janka test |
|
|
at 12% moisture content |
|||
|
kilonewtons |
pounds-force |
||
|
courbaril, jatoba |
Hymenaea courbaril l. |
10.8 |
2550 |
|
sucupira |
Diplotropis purpurea |
9.5 |
2140 |
|
Balsamo |
Myroxylon spp. |
8.7 |
2200 |
|
merbau |
Intsia spp. |
8.2 |
1925 |
|
Tigerwood |
Astronium gracile |
7.9 |
1850 |
|
Doussie |
Afzelia africana spp. |
7.7 |
1770 |
|
kempas |
Koompassia malaccensis |
7.6 |
1710 |
|
afromosia |
Pericopsis elata |
7.1 |
1560 |
|
sapele |
Entandrophragma cylindricum sprague |
6.7 |
1510 |
|
Hard maple |
Acer spp. |
6.6 |
1450 |
|
white oak |
Quercus spp. |
6 |
1360 |
|
beech |
Fagus spp. |
5.8 |
1300 |
|
red oak |
Quercus rubra |
5.7 |
1290 |
|
iroko |
Chlorophora spp. |
5.6 |
1260 |
|
burma teak |
Tectona spp. |
4.6 |
1150 |
|
black walnut |
Juglans nigra l. |
4.5 |
1010 |
|
American cherry |
Prunus serotina ehrh |
4.2 |
950 |
|
birch |
Betula spp. |
3.4 |
760 |
