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: Celazole® PBI (Duratron® CU60 PBI)

Size and Availability:

Sheet / Plate:
- Thickness: 1/2”(min) to 1-3/4”(max)
- Sheet sizes: 12”x 12” and 12”x 24”
- Lead times: non-stock item, call for lead times

Rod / Round:
- Diameters: 3/8”dia to 1-1/2”dia (minimum required)
- Diameters: 2”dia to 4”dia (1 length is min order)
- Lengths: 12”long (max, standard)
- Lead times: non-stock item, call for lead times

As an unreinforced material, Celazole PBI is very "clean" in terms of ionic impurity and it does not outgas (except water). These characteristics make this material very attractive to semiconductor manufacturers for vacuum chamber applications. Celazole PBI has excellent ultrasonic transparency which makes it an ideal choice for parts such as probe tip lenses in ultrasonic measuring equipment.

Celazole PBI is also an excellent thermal insulator. Other plastics in melt do not stick to PBI. These characteristics make it ideal for contact seals and insulator bushings in plastic production and molding equipment.

Celazole PBI is the highest performance engineering plastic available today. It offers the highest heat resistance and mechanical property retention over 400°F (205°C) of any unfilled plastics. It has better wear resistance and load carrying capabilities at extreme temperatures than any other reinforced or unreinforced engineering plastic.


  • Highest mechanical properties of any plastic over 400oF
  • Highest heat deflection temp of any plastic at 800oF
  • Lowest coefficient of thermal expansion of all unfilled plastics
  • Highest compressive strength of all unfilled plastics


  • Insulator bushings
  • Valve seats and seals
  • Vacuum chambers
  • Semiconductor parts
  • Electrical connectors
  • Clamp rings