Lead-Free Fuse Glass Tubing

This lead-free glass tubing is engineered for fuse assembly. It belongs to the SiO₂-B₂O₃-R₂O glass system with low alkali oxide content and high silica composition. This material achieves low linear thermal expansion coefficient, low dispersion, reliable chemical stability, excellent thermal stability and good electrical insulation performance.

feature application available size Chemical Properties Physical Properties

Feature

The glass adopts optimized formula and delivers outstanding physical and chemical properties with rigid texture, offering high hardness, pressure resistance and superior explosion-proof grade. Special anti-explosion processing minimizes breakage risk to ensure safer operation. The tubing maintains high dimensional precision with neatly cut ends, and end-sealed finished items can be provided. Custom sizes and multiple glass variants with different thermal expansion coefficients are available to satisfy different customer requirements.

Application

This lead-free glass tubing serves as the outer housing for electronic fuses, widely used in circuit protection scenarios.

Available Size

No.	Outer Diameter (mm)	Wall Thickness (mm)	Length (mm)
1	1.6	0.3	1500
2	2.98	0.7	1500
3	3.15	0.7	1500
4	4.3	0.8	1500
5	4.6	0.8	1500
6	5.78	0.7	1500
7	5.78	0.9	1500
8	7.5	0.8	1500
9	8.9	1.2	1500
10	9.1	1.2	1500
11	9.2	1.0	1500
12	10	1.0	1500

Minimum length for end-sealed products: 5 mm; non-end-sealed tubing can be supplied in any custom length.
*For reference only
OEM is acceptable

Chemical Properties

Parameter	Unit	Grade	Test Standard
Dielectric Constant (20°C,6MHz)	/	-	SJ/T11043-1996
Loss Tangent (20°C,6MHz)	/	-	SJ/T11043-1996
Water Resistance	Grade	1	GB/T 17129-2010
Acid Resistance	Grade	1	GB/T 17129-2010

*For reference only

OEM is acceptable

Physical Properties

Parameter	Unit	Value	Test Standard
Thermal expansion coefficient (30~380°C)	×10⁻⁶/K	3.5 ~7.0	SJ/T11036-1996
Strain Point Ts	°C	540	SJ/T11039-1996
Transformation Temperature Tg	°C	560	SJ/T11039-1996
Softening Point (η=10¹³·⁴ poise)	°C	780	SJ/T11038-1996
Working Temperature (η=10⁴ poise)	°C	1060	SJ/T11040-1996
Density	g/cm³	2.46	SJ/T11033-1996
Elastic Modulus	MPa	77	GB/T 37780-2019
Thermal Stability	°C	≥230	SJ/T11037-1996
Volume Resistivity (350°C)	MΩ·cm	≥250	SJ/T11042-1996