Fuseal Squared® Double Containment Corrosive Waste


Federal, state and local regulations have been created to protect our environment from industrial pollution. Protection of the soil and the groundwater table are of primary concern. The Fuseal Squared® system, with a modular design, is a reliable and cost-effective solution for conveyance of industrial and laboratory waste products. Excellent chemical and physical properties make the system ideal for handling corrosive waste solutions present in laboratory and industrial DWV applications where double containment is required.

Fuseal Squared® in Polypropylene or PVDF combines the advantages of corrosion-resistant and flame retardant drainage piping with the added security of double-containment.

Product Overview

Technical Data:

Size Range:

  • 1½" - 8" inner pipe
  • 4" - 12" outer pipe

Pressure Rating:

  • -30 foot (15 PSI) maximum head pressure test for DWV applications
  • -Up to 50 PSI for pressure waste applications (subject to manufacturers review of design)

Operating Temperature:

  • 32°F - 212°F (0°C - 100°C)

Joining Technology:

  • Electrofusion

Standard Ratings:


  • ASTM D635
  • ASTM D1222
  • ASTM D1599
  • ASTM D3310
  • ASTM D4101
  • ASTM F1290
  • ASTM F1412
  • IGC 164-2001

Polyvinylidene Fluoride:

  • ASTM D635
  • ASTM E-84
  • ASTM F1673
  • UL 723
  • UL 94-VO


  • Polypropylene Non-Flame Retardant Pipe (PPNFR)
  • Polypropylene Flame Retardant (PPFR)

Fields of Application:

  • Double-contained Corrosive Waste Drainage
  • Life Sciences
  • Chemical Process Industry
  • Food and Beverage


  • Outstanding chemical and corrosion resistance
  • Electrofusion joints
  • Maintenance-free service with low installation cost
  • Can withstand intermittent temperatures up to 212°F (100°C)




  1. Pipe and fittings for secondary contained corrosive waste piping system installed above ground shall be manufactured of Schedule 40 flame retardant polypropylene (pipe installed below ground shall be manufactured of Schedule 40 non-flame retardant polypropylene), joined by the electrofusion method, as manufactured by George Fischer Sloane  “Fuseal Squared” or approved equal. All system components shall conform to ASTM D4101 “Standard Specification for Polypropylene Plastic Injection and Extrusion Materials”, from either Type I homopolymer polypropylene or Type II copolymer polypropylene. The system shall also meet UPC 164-2001 “Standard Specification for Dual Containment Piping Systems Intended to Convey Acid Wastes or Other  Special Wastes”

  2. Flammability requirements of the pipe and fittings shall be based on ASTM 635 "Standard Test Method for Rate of Burning and/or Extent and Time of Burning of Self Supporting Plastics in a Horizontal Position".

  3. Pipe shall be produced to Schedule 40 Iron Pipe Size dimensional standards and meet ASTM F-1412 quality requirements for “Polyolefin Pipe and Fittings for Corrosive Waste Drainage Systems”. Fitting design shall be based on ASTM D3311 DWV Plastic Fittings Patterns. All pipe shall be marked with +GF+ Fuseal, pipe size, Schedule 40, ASTM-F1412, UPC, date stamp, Made in USA; and be compatible with coil fusion method.

  4. Each fusion coil shall consist of a polypropylene-jacketed wire, mandrel wound, and heat fused on the outer surface. The coils shall be either molded into a polypropylene collar or shall be independent and loose fitting pending the size used. Both styles shall have a duplex receptacle for connection to the fusion unit.

  5. Primary and secondary system components (fittings) shall be molded, or fabricated via standard plastic injection molding, butt fusion or electrofusion.

  6. Centralizers for both fittings and pipe lengths shall be installed onto the primary pipe/fittings at the factory. Extra centralizers are to be provided to the installer to be used if required. If leak detection cable is to be installed within the interstitial space, the centralizers will be fabricated with enough space for pass through of said cable (factory will also provide pull line in all pipe lengths and fittings for ease of cable installation by the contractor).

  7. Any custom fittings which may need to be fabricated due to field situations shall conform to the requirements of this specification.

  8. A factory representative shall assist the contractor in system "take-off" prior to an order being placed with the factory, to ensure all required components of the system are understood.



  1. Pipe and fittings shall be installed according to current "Fuseal Squared" installation instructions. An on site installation seminar shall be conducted by George Fischer Sloane personnel. Seminar shall include all aspects of product installation (set-up, support spacing, fusion procedure, test procedure, etc.). At the conclusion of the installation seminar, all installers will be given a certification test and, upon successful completion of said test will be issued a certification card verifying that they have met the requirements of the factory with regards to knowledge of proper product installation methods.

  2. Only the George Fischer Sloane fusion unit Model MSA-250SE/EX may be used in the installation of the Fuseal Squared piping system.


The system shall be tested in accordance with the manufacturers’ recommendations

Following is a general test procedure for Georg Fischer plastic piping. It applies to most applications. Certain applications may require additional consideration. For further questions regarding your application, please contact your local GF representative

  1. All piping systems should be pressure tested prior to being placed into operational service.

  2. All pressure tests should be conducted in accordance with the appropriate building, plumbing, mechanical and safety codes for the area where the piping is being installed.

  3. When testing plastic piping systems, all tests should be conducted hydrostatically and should not exceed the pressure rating of the lowest rated component in the piping system (often a valve). Test the system at 150% of the designed operational pressure, i.e.: If the system is designed to operate at 80PSI, then the test will be conducted at 120PSI.

  4. When hydrostatic pressure is introduced to the system, it should be done gradually through a low point in the piping system with care taken to eliminate any entrapped air by bleeding at high points within the system. This should be done in four stages, waiting ten minutes at each stage (adding ¼ the total desired pressure at each stage).

  5. Allow one hour for system to stabilize after reaching desired pressure. After the hour, in case of pressure drop, increase pressure back to desired amount and hold for 30 minutes. If pressure drops by more than 6%, check system for leaks.

    Note: If ambient temperature changes by more than 10°F during the test, a retest may be necessary.

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