木材简卡硬度

Janka硬度主要测试表面硬度而非端面硬度。Janka单位是磅，转化为牛顿（Pa压强标准单位,N/cm2）要乘以4.44。

2000~2999: 硬 //紫檀2940，大红酸枝226

3000~3999: 甚硬 //风车木，依贝3800*，奥氏黄檀3060

4000~4999: 超硬 //绿檀4200，蛇纹木4150，东非黑黄檀4050

5000~: 极硬 //异木麻黄5060

我们的紫檀2940，大红酸枝2260，属于硬类，上面还有3层超硬类。

超级硬木族

Schinoposis , 辛诺普西

Guaiacum, 怪爱可，愈疮木，中国用名为铁梨木。属疾藜科

Acacia, 爱可夏，阿拉伯树胶；刺槐；金合欢属

Xanthostemon ，仙草斯泰姆，蒲桃

名木族：

Mahogany 桃花心

Swartzia, 铁木豆

Diospyros, 柿子树属

Caesalpinia, 苏木属

世界硬木排名前25：

1 - Buloke Australian {Allocasuarina luehmannii} 5060 - Specific Gravity 1.11 异木麻黄属

5060 Pounds Force {lbf} - 2294 Kilograms Force {kgf} - 22.5 Kilonewtons {kN} - 22500 Newtons {N}

2 - Quebracho Colorado - Soto {Schinopsis brasiliensis} 4800 - Specific Gravity 1.28

3 - Quebracho Colorado - Paag {Schinopsis lorentzii} 4700 - Specific Gravity 1.22

5 - Belah {Casuarina cristata} 4500 - Specific Gravity 1.15

5 - Lignum Vitae - Tree Of Life {Guaiacum officinale} 4500 - Specific Gravity 1.35

6 - Lignum Vitae Philippine {Xanthostemon verdugonianus} 4450 - Specific Gravity 1.22

7 - Mgurure {Combretum schumannii} 4430 - Specific Gravity 1.08，风车子属

8 - Bauhinia Red {Lysiphyllum carronii} 4400 - Specific Gravity 1.39， 豆科植物

9 - Tubi - Blackwood Solomon - Ebony Queen {Xanthostemon melanoxylon} 4370 - Specific Gravity 1.231

10 - Knob Thorn {Acacia nigrescens} 4290 - Specific Gravity 1.21

11 Gidgee {Acacia cambagei} 4270 - Specific Gravity 1.35

12 Gidgee Georgina {Acacia georginae} 4270 - Specific Gravity 1.33

13 Tiga {Tristaniopsis decorticata} 4260 - Specific Gravity 1.053

14 Lignum Vitae - Holywood {Guaiacum sanctum} 4250 - Specific Gravity 1.31 - Hardest Wood In United States

15 Quebracho Colorado - Barauna {Schinopsis balansae} 4250 - Specific Gravity 1.22

16 Lignum Vitae Maracaibo {Bulnesia arborea} 4200 - Specific Gravity 1.25 维拉木，绿檀

17 Lignum Vitae Paraguayan {Bulnesia sarmientoi} 4200 - Specific Gravity 1.19

18 Snakewood Australian {Acacia xiphophylla} 4150 - Specific Gravity 1.321 蛇桑

19 Wattle Lakewood {Acacia enervia} 4150 - Specific Gravity 1.32

20 Spearwood Brown {Acacia rhodoxylon} 4100 - Specific Gravity 1.28

21 Gimlet {Eucalyptus salubris} 4090 - Specific Gravity 1.225，桉树；桉属植物

22 Oak Black Australian {Casuarina pauper} 4080 - Specific Gravity 1.29，木麻黄

23 Blackwood African {Dalbergia melanoxylon} 4050 - Specific Gravity 1.28 南非黑黄檀

24 Wattle {Acacia excelsa} 4050 - Specific Gravity 1.15

25 - Lignum Vitae Texan {Guaiacum angustifolium} 4030 - Specific Gravity 1.276

The Janka Hardness Scale was invented in 1906 by Gabriel Janka {1864 - 1932}. He was an Austrian wood researcher. In 1906 at the age of 42 he wrote the 40 page book, Die Harte Des Holzes {translated is} The Hardness Of The Wood.

The Janka Hardness Test measures how hard wood/lumber/timber is. The higher the number the harder the wood is. It is an adaptation of the Brinell Hardness Test for metals.