性状：黑灰色金属，有延展性。钽的化学性质特别稳定，常温下除氢氟酸外不受其它无机酸碱的侵蚀；高温下能溶于浓硫酸、浓磷酸和强碱溶液中；金属钽在氧气流中强烈灼烧可得五氧化二钽；常温下能与氟反应；高温下能与氯、硫、氮、碳等单质直接化合。　　
熔点：2996℃
沸点：5425℃
密度：16.6

备注: 以上描述，仅作参考，并不表示您收到的产品，与此项描述完全相符，产品的出厂标准，请参见质量标准。

质量标准

23K:

化学成分：
C                                          32
O                                          1620
N                                          110
K                                           6
Na                                        <5
Si                                         <15
Fe                                         9
Ni                                         7
Cr                                         6
W                                          <10
Nb                                        <10
Mo                                        <10
Mn                                        <10
Ti                                         <3
Mg                                        <5
P                                          30
H                                          60

物理性能:
筛分析（目数%）
+80                                        1
-80/+200                               47
-200/+325                             22
-325                                      30
平均粒径(PM)                     2.7
孔隙度(%)                          0.825
松装比重(g/cm³)                1.80
流动性(S/30)                        11

电性能：
    项目                                     实测值
阳极块重量(g)                              0.15
阳极块直径(mm)                           3.0
长度(mm)                                    4.25
压制密度(g/m³)                            5.0
烧结温度（℃）                           1550
烧结时间（min)                            20
烧结密度(g/m³)                            5.75
体积收缩（％）                            13.0
赋能液（H3PO4)                           0.01
形成电压（V）                              70
赋能温度（℃）                             90
赋能电流密度（mA/g)                    60
测试交数（支）                             10      
K值（ΩA/μFV) ）                     0.13
比电容（μFV/g）                        23600
损耗（％）                                   4.5
击穿电压（V）                              182
漏电流（μA/g）                           3.07
折丝                                          5、5、5

贮存：密封保存。

用途：钽最早用于制灯丝，后被钨丝代替；化学工业中钽用于制造耐酸设备；由于钽不被人体排斥，可用作修复骨折所需的金属板、螺钉等，还用于制造外科刀具和人造纤维的拉线模等

联合国编号：3089

Risk：R23/25- R50/53--

Safety : S16- S26- S33- S36/37/39-

Hazard : F - Xi -