The Property Comparison of Tungsten and Lead

	Lead	Tungsten
Atomic number	82	74
Density	11.34g/cm3	19.3g/cm3
Melting point	327.5℃	3410℃
Boiling point	1740℃	5900-6000℃
Hardness	Soft (Mohs' hardness 1.5)	>400(HV30)
Thermal conductivity	30w/m·k	167w/m·k
Linear expansibility	24*10-6 /K	4.36*10-6 /K
Compressive strength	small	>700MPa
The effect of shielding X-ray radiation	Not good	Above 3 times better than lead in the same thickness
Toxicity	Heavy metal, toxic	Non-toxic, environmental friendly
Government Policy	Restrict	Encourage new tech-product
Influence to the equipment quality	EU has prohibited lead using on the electronic and medical equipment, and lead hinders the equipments’ internationalization	Tungsten is helpful to develop the equipments into more precise and digitalization, and also is the suitable material in enhancing competition of the equipment
Market development future	Government restriction will pose heavy and the future is unpromising.	Tungsten has a promising future, the future development direction
Application condition	The security inspection/medical equipments in China are stay on the stage of using lead.	Foreign big companies adopt tungsten alloy products instead of lead in security inspection/medical equipments