Epoxy Glass Washers or Spacers also yield very good electrical properties in dry and humid conditions Stamped Non-Metallic Epoxy Glass (G-10/FR-4) Washers Epoxy Glass Flat Washers or Epoxy Glass Spacers are stamped from NEMA grade laminates(3240,fr4,fr5,g10,g11,gpo-3) Customer's design, satisfying different market needs, in both large and small quantities