Glass cloth for printed wiringboards

One of the greatest uses of glass cloth is as electric insulating base materials that make the most of such glass fiber properties as electric insulation, heat resistance, and dimensional stability.

Combined with materials, such as epoxy resin and polyimide resin, glass cloth is used for the manufacture of printed wiringboards of electronic equipment (such as computers, communications devices, and switchboards). Higher value can be added to printed wiringboards by applying glass cloth processing technology (fiber opening technology), a field dominated by Nittobo.

printed wiringboard model (cross section)

printed wiringboard model (cross section)

Note) Glass cloth is not used for all printed wiringboards.

Glass cloth specifications

IPC specifications (excerpts) Thickness (mm) Weight (g/m²) Density (/25mm) Manner of weaving
Warp Weft
106 0.035 25 56 56 Plain weave
1080 0.055 47 60 46 Plain weave
3313 0.075 83 60 62 Plain weave
2116 0.095 104 60 58 Plain weave
1504 0.125 148 60 50 Plain weave
1501 0.140 165 46 45 Plain weave
7628 0.180 209 44 32 Plain weave

High performance glass cloth

With the remarkable development of digital technology, electronic equipment typified by PCs and smartphones has become increasingly lightweight, thin, small, and functional, and manufacturers are strongly urged to enhance the characteristics of glass cloth.
Based on the development of glass composition and textile technology as well as textile processing technology, Nittobo offers glass cloth products, making the most of its strengths as an integrated manufacturer.

Low-dielectric-property glass cloth (NE glass)

As computers, mobile terminals, and communications infrastructure have evolved into increasingly high-speed, high-frequency systems, manufacturers of printed wiringboards have been required to use low-dielectric-property materials to reduce transmission loss. To that end, Nittobo has achieved low dielectric constant and low dielectric dissipation factor using NE-glass yarn that it has developed independently rather than conventional E glass.

Dielectric constant (1GHz) Dielectric dissipation factor (1GHz)
E glass 6.8 0.0035
NE glass 4.8 0.0015
  • * All data listed above are examples of actually measured values and not standard ones.

Low-CTE glass cloth (T glass)

Excellent dimensional stability and increased rigidity can be achieved using T-glass yarn, which is characterized by its low coefficient of thermal expansion (CTE) and high tensile elasticity.

Thermal expansion coefficient (×10-6/℃) Tensile elasticity modulus (GPa)
E glass 5.6 75
T glass 2.8 86
  • * All data listed above are examples of actually measured values and not standard ones.

Ultra-thin glass cloth

Thinner glass cloth is desired for materials to meet the requirements of printed wiringboards as such materials are used at high densities and have become increasingly lightweight, thin, and small. Not only is Nittobo's ultra-thin glass cloth exceptionally thin, it excels in the ability to make very small holes in both laser and drill processing as well. Furthermore, this material is excellent in terms of lamination characteristics, such as dimensional stability and surface smoothness.

IPC specifications
(excerpts)
Thickness
(mm)
Weight
(g/m²)
Density (/25mm) Manner of weaving
Warp Weft
1037 0.025 24 69 72 Plain weave
1027 0.020 19 74 74 Plain weave
1017 0.015 13 95 95 Plain weave
1010 0.013 10 95 95 Plain weave
  • * All data listed above are examples of actually measured values and not standard ones.

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