Shin-Etsu Chemical Co.,Ltd. Organic Electronics Materials Dept.

Quartz cloth

SQX series

The SQX (quartz cloth) series is core materials of low-dielectric substrates and a cloth product for pre-preg of CCL (Copper Clad Laminate) board.
Compared to conventional glass cloth, SQX has low dielectric and low dielectric loss tangent, it is suitable for base material for high-frequency substrates and FRP.
In addition, since SQX has a coefficient thermal expansion of about 1/10 that of general glass cloth, SQX can be used as a material for thin package substrates.
SQX can also be considered as a low alpha ray material.


Grade Dk Df CTE Flexural modulus
10-80GHz 10-80GHz ppm/°C GPa
SQX series 3.7 < 0.001 0.5-0.6 74-76

* The data of each product that exists in the above-mentioned table is not a standard value. Please test without fail before use beforehand, and confirm whether to suit use.