ACT-100® & ACT-100-U® Composite Underground Tanks
Manufactured in Suwanee, GA by Metal Products Company. ACT-100® (fiberglass-reinforced plastic clad) and ACT-100-U® (high-build urethane clad) composite underground steel storage tanks unite the structural strength of UL 58 carbon steel with a 35,000-volt spark-tested external barrier—delivering anode-free corrosion immunity in the most aggressive soil and stray-current environments.
ACT-100® & ACT-100-U® Engineering Specifications
Built to Steel Tank Institute (STI) composite specifications and UL 1746 Part 2 standards for maintenance-free underground fuel containment.
Why Specifiers Choose ACT-100®
- Zero Anode Maintenance: Composite cladding eliminates recurring 3-year sacrificial anode voltage testing under EPA 40 CFR 280.
- 100% Biofuel & Ethanol Ready: Inner steel wall handles E15, E85, and B20 biodiesel without structural fiberglass degradation.
- 35,000V Holiday Spark Tested: Every square inch of composite laminate is factory tested for pinhole-free dielectric integrity.
Compare with STI-P3® Cathodic Tanks
Prefer galvanic sacrificial anode protection? Explore our STI-P3® Cathodically Protected Underground Tanks or coordinate turnkey UST installation with The APEC Group.
Call Engineering Sales: (770) 945-8383Frequently Asked Questions: ACT-100® Composite USTs
How does an ACT-100® composite tank differ from an all-fiberglass (FRP) underground tank?
An all-fiberglass tank relies solely on brittle plastic walls for structural support and requires careful pea-gravel backfill to prevent deflection or cracking under traffic loads. An ACT-100® tank combines a heavy-gauge UL 58 structural carbon steel core with a 100-mil external FRP composite laminate—delivering the structural strength of steel alongside the maintenance-free external corrosion immunity of fiberglass.
Do ACT-100® or ACT-100-U® tanks require periodic cathodic protection testing?
No. Unlike cathodically protected tanks that use sacrificial anodes, ACT-100® and ACT-100-U® composite tanks isolate the steel shell behind an impermeable 100-mil non-metallic barrier tested to 35,000 volts. Because corrosion protection is achieved through composite cladding rather than galvanic anodes, no recurring 3-year cathodic voltage testing is required.
Are ACT-100® tanks compatible with ethanol blends (E15, E85), biodiesel, and DEF?
Yes. Because stored fuels contact the interior carbon steel (or optional interior epoxy/stainless lining) rather than structural fiberglass resin, ACT-100® tanks are fully compatible with all modern ethanol-blended gasolines (E10, E15, E85), ultra-low sulfur diesel (ULSD), biodiesel (B20/B100), and aviation fuels without risk of resin softening.
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