Lead Glass Tube

Lead glass tube is a classic lighting glass material featuring high density and a high refractive index, which endows the glass with brilliant luster and clear optical performance. It possesses excellent thermal workability, high electrical resistivity and outstanding sealing compatibility with dumet lead wires, ensuring stable and airtight sealing effects for various lighting components during mass production.

feature application available size Chemical Properties Physical Properties

Feature

Containing lead oxide composition, lead glass tube delivers superior refractive index and excellent light transmittance compared with ordinary glass, presenting brighter and more uniform lighting effects. The material features ideal thermal softening properties, allowing easy heating, bending and shaping during processing to produce complex and precise lighting structural parts. With stable physical and insulating performance, lead glass maintains consistent quality and long service life under conventional lighting working conditions.

Application

Lead glass tube is predominantly manufactured into flare tubes and exhaust tubes widely used for incandescent bulbs and fluorescent lighting products. It is also extensively adopted in neon sign production and various customized and specialized lighting component applications.

Available Size

Parameter	Value
Outer Diameter	2~26mm
Wall Thickness	0.4~1.7mm
Length	0.85m, 1.25m, 1.40m, 1.60m and 1.70m

OEM is acceptable

Chemical Properties

Low Lead Glass Tube

Composition	SiO₂	PbO	Na₂O	K₂O	CaO	BaO	B₂O₃	Al₂O₃	Fe₂O₃
Weight (%)	65.5±1.0	11.0±1.0	9.5±0.4	4.0±0.4	3.8±0.4	2.5±0.3	1.2±0.2	1.0±0.2	≤0.2

*For reference only

Medium Lead Glass Tube

Composition	SiO₂	PbO	Na₂O	K₂O	BaO	Al₂O₃	B₂O₃	Fe₂O₃
Weight (%)	63.0	20.5	8.8	2.9	2.1	0.85	0.8	0.12

*For reference only

High Lead Glass Tube

Composition	SiO₂	PbO	K₂O	Na₂O	Al₂O₃
Weight (%)	57.0	29.0±1.0	8.5±0.5	4.0±0.5	1.0~1.5

*For reference only

OEM is acceptable

Physical Properties

Low Lead Glass Tube

Property	Value
Linear Expansion Coefficient (30~380℃)	(9.1±0.1)×10^-6/℃
Density	2.72g/cm³
Softening Point	660±10℃
Annealing Point	470±20℃
Working Point	1020℃
Heat Stability	≥110℃
Chemical Stability	Hydrolytic Class III

*For reference only

Medium Lead Glass Tube

Property	Value
Linear Expansion Coefficient (30~380℃)	(9.05±0.10)×10^-6/℃
Density	2.85g/cm³
Softening Point	630±10℃
Heat Stability	≥122℃
Chemical Stability	Hydrolytic Class IV

*For reference only

High Lead Glass Tube

Property	Value
Linear Expansion Coefficient (30~380℃)	9.40×10^-6/℃
Density	3.05g/cm³
Softening Point	620℃
Annealing Point	415±20℃
Strain Pont	400℃
Electric Inductivity (1Mhz,25℃)	6.8
X-ray Absorption Coefficient (cm at0.6Å)	80min