Electric Glass Building Materials Co.,Ltd.

LX Series

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LX-57B is high lead-barium glass, and features high radiation shielding capability and excellent transparency. LX-57B is produced under strict product standards and quality control.


1. JIS Certified Product
With its high content of lead and barium, LX-57B lead glass has excellent radiation shielding capability. For example, 9 mm-thick LX-57B has the same X-ray shielding capability (lead equivalent: 2.0 mmPb) as 2 mm-thick lead plating.
LX-57B is a JIS certified product.
2. Large Sizes Increase the Field of Vision
The largest LX-57B product is 1,200 x 2,600 mm. Use of large-size LX-57B for observation and operation windows in X-ray TV rooms, CT scanning rooms and angiography rooms provides a wider field of vision to improve operations.
3. Glass Characteristics
LX-57B would not be combustible even in the event of a fire because it is an inorganic glass. LX-57B is easy to process. It can also be formed into a disk plate, or drilled for glove box.
4. Excellent Transparency
LX-57B allows very high light transmittance. This transmittance is almost the same as that of a normal window glass. Because of its excellent transmittance, LX-57B can be used with great advantage in observation and operation windows of radiation equipment.

Glass Thickness and Lead Equivalent

Glass Thickness(mm) Lead Equivalent(mmPb) Notes
6.0 ± 0.5 1.1 Lead equivalent is guaranteed within
an X-ray tube voltage range of 60 to 150 kV.
7.0 ± 0.5 1.5
9.0 ± 0.5 2.0
11.0 ± 0.5 2.5
14.0 ± 0.5 3.0 Lead equivalent is guaranteed within
an X-ray tube voltage range of 60 to 200 kV.

*NEG also offers products with a shielding capability of over 3.0 mmPb in lead equivalent (radiation source: X rays) as well as products for radiation sources other than X rays. For more information, please contact us.

Max. Size and Specific Gravity

Maximum Stock Size Specific Gravity
1,200×2,600㎜ Min.4.36


Maximum Stock Size Specific Gravity
Thermal Thermal expansion coefficient (/°℃) 80×10-7 (30~380℃)
Softening point (°C) 585
Mechanical Bending strength (MPa) 25
Young’s modulus (GPa) 63
Poisson ratio 0.24
Knoop hardness 370
Optical Refractive index (Na-D rays) 1.71
Transmittance at 550 nm (%) 85

*The values above are not guaranteed values.


Transparency is almost the same as that of normal window glass.

Light Transmittance