Alro logo Alro Steel was established in 1948 by Al and Robert Glick and has grown to include Alro Plastics, Alro Industrial Supply 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