SECONDARY CONTAINMENT - Containment Accessories

Interlocking Expanded Polystyrene Tank Bases

Save money and protect your assets with Interlocking Tank Bases. In the past, preparing a site for above ground storage tank placement included pea gravel installation. While this method appeared more cost effective, over time the gravel was inevitably exposed to leaks and spills. Now costly remediation can be eliminated with Enviro-Guard Foam Interlocking Tank Bases (patent pending). Installed on minimally prepared ground, they not only ease site preparation and reduce setup costs, but their non-permeable surface is easily cleaned for future use.

Every reusable Enviro-Guard Foam Interlocking Tank Bases is encapsulated with a two-component, rapid curing pure polyurea. The signature design consists of three interlocking parts that eliminate strapping. All parts are universal, able to be interchanged as required, allowing for ease of shipping and installation. Enviro-Guard Foam Interlocking Tank Pads are the smart choice to minimize concerns for yourself and our environmentally aware society!

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Product Benefits:

  • Easily cleaned - Eliminates ground contact
  • Non-permeable polymer coating with radius edge design quickly sheds water
  • Lightweight cellular plastic core
  • Quickly installed and adjusted by a two-man team
  • No strapping required; interlocking parts maintain bond
  • All parts are universal
  • Insulating
  • Nonconductive
  • Non-permeable polymer coating
  • Non-corrosive - Rot and mold resistant
  • Manufactured to fit any tank size
  • Truckload quantities
Density (minimum)
1.58 lb
Compressive Resistance
  @ 1% strain, psi (minimum)
10.56 psi
  @ 3% strain, psi (minimum)
20.98 psi
  @ 5% strain, psi (minimum)
23.15 psi
Flexural Strength @ 1% strain, psi (minimum)
Hardness, Shore D (ASTM D-2240)
Tensile Strength, psi (ASTM D-412)
Tear Strength, pli (ASTM D-624)
Elongation, % (ASTM D-412)
Specific Gravity, grams/cc (ASTM D-624)
1.06 - 1.08
Water Absorption, % (ASTM D-570)
≤ 1.5
Our professional installation crews consider your safety procedures a top priority. Our outstanding record testifies to our commitment to work safety. To learn more about the Unit Liner commitment to safety Click Here.