Duromar HPL-4320

High-Performance Chemical-Resistant Epoxy Lining

When concrete and steel infrastructure face continuous exposure to severe corrosive agents, standard coatings usually fail. Duromar HPL 4320 makes the difference by offering unmatched industrial protection with its special formulation. It creates a dense impermeable barrier capable of locking out aggressive inorganic chemicals, including sulfuric acid. Engineers and facility managers rely on this high-performance epoxy lining to protect critical assets, prevent structural degradation, and reduce operational downtime.

Duromar HPL-4320: High-Temperature Protection

Shield your concrete and steel from harsh environments with a coating built for the job. This 100% solids novolac epoxy stops corrosion dead in its tracks, serving as a highly dependable barrier for chemical storage tanks and secondary containment systems. Stop risking costly facility downtime and keep your critical infrastructure intact against continuous inorganic acid exposure. Need a different service profile? Compare it with HPL-4320-XC and HPL-4323.

Duromar HPL-4320 chemical-resistant novolac epoxy lining - product photo coming soon

HPL-4320 Properties

  • Components – 2

  • Solids by Weight – 100%

  • Mix Ratio by Weight – 2.5:1 (B/A)

  • Mix Ratio by Volume – 2:1 (B/A)

  • Working Time – 20 minutes @ 70°F

  • Recoat Time (min/max) – 3-24 hours @ 70°F

  • Functional Cure – 48 hours @ 70°F

  • Full Cure – 168 hours @ 70°F

Download HPL-4320 Data Sheet

FAQs About Our Duromar HPL-4320

It’s the go-to epoxy lining for chemical storage tanks, secondary containment areas, and neutralization trenches. Industrial facilities rely on it anywhere severe, continuous chemical exposure threatens bare concrete or steel infrastructure.

This lining takes on the worst inorganic acids out there. This material is formulated for constant immersion in the harshest environments. That means you get reliable, long-term protection against highly concentrated substances, including extreme caustics and 98% sulfuric acid.

You’ve got options. For massive tank interiors, contractors use a heated plural component airless spray system for fast, uniform coverage. For spot repairs or tight flanges, you can easily brush or trowel it on by hand.

Yes. To hit peak chemical resistance, this material requires an elevated temperature post-cure. Baking the coating forces the polymers to fully cross-link, which is the secret behind its legendary durability in extreme service conditions.

It means there are zero solvents to evaporate and zero VOCs. You get maximum mil thickness in every coat with zero shrinkage. The result is a rock-solid, impermeable shield that aggressive chemicals simply cannot penetrate.

Without a doubt. Thanks to a specialized cycloaliphatic amine hardener, the lining handles intense heat with ease. You don’t have to worry about the coating softening or breaking down when temperatures spike, which ensures your containment areas and tanks stay secure throughout demanding production cycles.

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