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: PHENOLIC G-10/FR4 (Glass Epoxy)

Size and Availability:

Sheet / Slab stock:
- Thickness: 1/16”thk to 4”thk standard
- Sheet sizes: 48”x 120”, 48”x 96”, 48”x 48”, 36”x 48”

Rod / Solid Rounds:
- Diameters: 1/16” to 2-1/4”Dia.
- Lengths: 2 ft to 4 ft standard lengths

Tubing / Hollow Rounds:
- Diameters: 3/16”OD x 1/8”ID up to 2.50”OD x 1.50”ID
- Lengths: 2 ft to 4 ft standard lengths

Phenolic G-10/FR4 is a continuous woven glass fabric laminated with an epoxy resin. This grade is extremely high in mechanical strength, has low water absorption and dissipation factors and has superior electrical characteristics, which are exhibited over a wide range of temperatures and humidities.

Grade G-10 is used for terminal boards, washers, sleeves, structural components, and parts where the strength to size ratio is critical.

Phenolic G-10/FR4 complies with the requirements of MIL-1-24768/27, Type GEE-F.


  • Extremely high mechanical strength
  • Low water absorption
  • Superior electrical characteristics


  • Terminal boards
  • Washers
  • Sleeves
  • Structural components