ASTM D1531
ASTM D1531 – Standard Test Methods for Relative Permittivity (Dielectric Constant) and Dissipation Factor by Fluid Displacement Procedures (Withdrawn 2012) Description: Significance and Use Permittivity: 5.1.1 Polyethylene and Materials of Permittivity Within 0.1 of That of Polyethylene—Since the permittivity of benzene or 1-cSt silicone fluid is very close to that of polyethylene, these fluids are recommended …