High Infrared-Absorbing Glass Tubes

Glass tube for reed switches

High infrared absorption allows sealing through local heating using halogen lamps or lasers. STI and SRI have excellent sealability with 52Ni-Fe alloy, and SHI is excellent with Co-Fe alloy. We can supply “ultra-short glass tubes” as short as 3.0mm in length or “one-side sealed glass”.

Properties
Standard Dimensions

Properties

Properties/Glass code			STI	SRI	SHI
Coefficient of thermal expansion	30～380℃	×10^-7/K	94	92.5	119.5
Density		×10³kg/m³	2.53	2.54	2.67
Strain point		℃	420	410	410
Annealing point			460	450	450
Softening point			650	635	625
Working temperature			980	965	930
Hydrolytic resistance	JIS R3502	R₂Omg	0.6	0.5	0.5
Volume resistivity Logρ	150℃	Ω･cm	12.2	10.3	10.6
Volume resistivity Logρ	250℃	Ω･cm	9.3	7.7	8.0
Color			Green
Transmittance	λ=1050nm, t=1mm	%	≦5
Glass type			K₂O･BaO･SiO₂	Na₂O･BaO･SiO₂	Na₂O･K₂O･ZnO･SiO₂
Sealing metal			52Ni-Fe alloy		Co-Fe alloy, etc.

Viscosity

Transmittance

Standard Dimension Specifications

(mm)

Glass code	Outer diameter	Wall thickness	Length
STI	1.70±0.05	0.25±0.05	3.0～50.0
	2.05±0.05	0.23±0.05	3.0～50.0
	2.50±0.05	0.40±0.05	10.0～50.0
	4.95±0.10	0.64±0.10
	6.00±0.20	0.60±0.10
SRI	2.40±0.05	0.32±0.05
SRI	3.07±0.05	0.47±0.05
SHI	2.50±0.05	0.35±0.05	17.0～22.0