Alro logo Alro Steel was established in 1948 by Al and Robert Glick. Today, Alro is comprised of Alro Steel, Alro Metals, Alro Plastics and Alro Metals Outlet.

Alro Plastics Product: GPO-3 Electrical Grade sheet laminates


- Polyply #L50, NEMA Grade GPO-3, Red (color), # E82624

Size and Availability:

- Thickness: 1/32”thk to 1”thk, standard increments
- Sheet sizes: 48”x 96” and 36”x 72”

Alro Plastics is now a stocking distributor of GPO-3 Electrical Grade sheet laminates. All grades of our Electrical Grade sheet laminates are produced using polyester resin and fiberglass reinforcement. They are U.L. recognized and are available in 36" x 72" and 48" x 96" sheet. Sheets are manufactured in thickness ranging from 1/32 to 1 thick with most sizes in stock for immediate shipment.

Track resistant, flame retardant laminate which meets or exceeds NEMA GPO-3 requirements.

U.L. Recognition File Number: Polyply #L50, NEMA Grade GPO-3, Red (color), # E82624


  • Electrical insulation
  • Track resistance
  • Self extinguishing UL94 (V-0)
  • Chemical resistance
  • Low smoke
  • Low conductivity
  • Impact and Abrasion resistant
  • Good mechanical strength


  • Phase and End barriers
  • Insulating supports
  • Bus bar supports
  • Mounting panels in switch gears
  • Transformers
  • Antenna bases
  • Spacers