The phenolic-coated ISO tank uses a thin (0.4 to 0.8 mm) baked phenolic or epoxy-phenolic coating as a barrier between cargo and steel substrate. PlasticoMet and Plasite (Carboline) are the dominant coating-product brands. The coating is hard, mechanically brittle, and sensitive to mechanical damage, so service is limited to mild chemistries and gentle handling. The build sits between an unlined T11 stainless and a fully PE-lined or PTFE-lined tank on the cost / chemistry curve.
What phenolic-coated is built for
Solvents and mid-acidity chemicals where bare 316L stainless gives surface contamination via iron pickup or microscopic corrosion. The coating creates a chemically inert barrier that keeps the cargo from contacting the steel, eliminating the trace iron that would fail food-grade or specialty-chemistry specs. The coating is not a corrosion-prevention layer for aggressive cargoes; it is a contamination-prevention layer for cargo-purity-sensitive chemistry.
Construction and materials
Carbon-steel Q345R or 316L stainless cylinder, 6 mm reference thickness, with a 0.4 to 0.8 mm baked phenolic or epoxy-phenolic coating applied via spray and oven-cure. The coating is hard and dimensionally stable but mechanically brittle: dents, scratches, and impact damage break the coating and expose the substrate. Repair requires re-coating, which is typically a multi-thousand-dollar shop process.
The thin coating preserves internal volume (capacity stays at 23,000 L typical, only modestly below an unlined T11). Tare is essentially identical to an unlined build because the coating mass is negligible.
When phenolic-coated is the right choice
Phenolic-coated is the right tank for cargoes that need contamination prevention without full chemical lining, where the operator can guarantee gentle handling through the fleet rotation. Some specialty solvents, mid-acidity chemicals, and food-adjacent intermediates ride phenolic-coated tanks for the iron-pickup elimination.
When phenolic-coated is the wrong choice
Phenolic-coated is the wrong tank for aggressive cargoes (concentrated acids, strong bases, oxidisers). The coating fails rapidly under chemical attack. It is also the wrong choice for fleet rotations with high-pressure cleaning (the coating breaks under jet impact) or for any service where mechanical damage to the coating is likely.
How a phenolic-coated booking is verified
Pre-loading inspection covers the standard plate stack plus a coating-condition check (visual through the manlid for blisters, cracks, or chips). PlasticoMet or Plasite coating certificate provides installation date, coating product grade, thickness, and any repair history. Coatings typically last 8 to 15 years in service before re-application; the inspection window for re-application is about 1 mm of remaining coating thickness.