Carboline tank coatings protect aboveground storage tanks, process vessels, secondary containment and pipeline infrastructure across the oil, gas, chemical and petrochemical sectors. A subsidiary of RPM International — a $7.3bn coatings and sealants group — Carboline operates manufacturing facilities in the United States, Europe, the Middle East and Asia, with its flagship Plasite product line among the most specified chemical-resistant linings in the tank terminal and refinery markets globally.
Company Background and RPM International Ownership
Carboline was founded in 1947 in St. Louis, Missouri, and was acquired by RPM International in 1996. RPM’s portfolio spans industrial, consumer and specialty coatings — including Rust-Oleum, Tremco and Dryvit — and generated revenues of approximately $7.3bn in fiscal year 2024. Carboline operates as RPM’s primary industrial protective coatings division, focused on high-performance applications in energy, marine, infrastructure and industrial markets.
Global headquarters remain in St. Louis. The company distributes through a network of regional offices, specification teams and authorised applicator partners, with significant presence across the Gulf Coast, Europe and the Middle East — all key markets for bulk liquid storage and refinery maintenance spending.
Carboline holds ISO 9001 certification and its products are routinely specified to NACE International standards for corrosion control in immersion and chemical service environments. The NACE International and AMPP framework defines the qualification criteria against which many Carboline products are tested for immersion-grade approval.
Carboline Tank Coatings: Plasite, Thermo-Lag and Key Product Lines
The Plasite range is Carboline’s primary tank lining portfolio, developed specifically for chemical and solvent immersion service. Plasite 4110 and Plasite 9060 are widely used in chemical storage tanks, FRP vessels and secondary containment structures where resistance to concentrated acids, caustics, solvents and hydrocarbons is required. Plasite systems are specified across terminal, refinery and chemical plant applications globally.
Thermo-Lag is Carboline’s passive fire protection system, used on structural steel, vessels and pipework in processing facilities. Thermo-Lag 3000 intumescent coatings are specified in LNG terminals, refineries and petrochemical plants where jet fire and hydrocarbon pool fire resistance is a safety-critical requirement.
The broader Carboline product range includes epoxy tank linings for crude oil and product storage under the Phenoline and Carboguard series, novolac epoxy coatings for high-temperature chemical service, and surface-tolerant epoxy primers for maintenance applications in active terminals where ideal surface preparation is not always achievable. These products compete directly with the Tankguard range from Jotun Tank Coatings and the Interline series from AkzoNobel International Paint.
For external steel surfaces and atmospheric exposure, Carboline’s Carbothane and Carbozinc systems are specified for long-term asset protection on above-ground storage tank shells, roofs and supporting steelwork.
Tank Terminal and Refinery Applications in 2026
Carboline tank coatings are specified across crude oil storage, refined product tanks, chemical storage terminals and secondary containment bunds. In crude oil service, Phenoline 305 and Carboguard 890 are commonly applied to the internal surfaces of floating roof tanks storing sour crude, where sulphide-induced corrosion is an accelerating degradation mechanism.
In chemical terminals, the Plasite range addresses the broadest chemical resistance requirements, covering concentrated hydrochloric acid, sodium hydroxide, aromatic solvents and fuel alcohols — categories covered by the most demanding terminal operator specifications. This overlaps with the high-build epoxy chemistries offered by competitors such as Sherwin-Williams Tank Coatings and Hempel.
Carboline’s specification support model is a key commercial differentiator. Regional technical service managers work directly with terminal operators, EPC contractors and inspection firms during design and maintenance phases, providing coating system recommendations, compatibility assessments and on-site application support. This model mirrors the approach taken by Jotun and AkzoNobel International Paint in competing for major terminal maintenance contracts.
In 2026, activity in the Middle East Gulf terminal sector and the US Gulf Coast refinery market continues to drive demand for chemical-resistant linings, with new-build LNG terminal projects and refinery upgrade programmes generating project coating specification work. Carboline has maintained active tendering in both geographies through its Gulf and Americas regional structures.
NACE Compliance and Inspection Standards
All Carboline immersion-service products are formulated and tested to meet the corrosion control requirements set out by AMPP (formerly NACE International), the global standards body for corrosion engineers and coating inspectors. Tank lining applications are validated against NACE SP0188 (holiday testing of protective coatings), NACE SP0169 (external corrosion control) and project-specific owner specifications derived from API 653.
Carboline’s applicator qualification programme requires certified coating inspector oversight on tank lining projects. AMPP CIP Level 2 or equivalent is typically required for inspection sign-off on new tank lining installations and API 653 maintenance work, aligning with the qualification requirements used by major terminal operators when specifying coating contractors.
Competitive Position in the Tank Coatings Market
Carboline competes in the premium protective coatings segment alongside AkzoNobel (Interline, Interthane), Jotun (Tankguard, Jotacote), Sherwin-Williams (Tank Clad, Dura-Plate), Hempel (Hempadur, Hempaxane) and Advanced Polymer Coatings (MarineLINE, ChemLINE). The Advanced Polymer Coatings phenolic epoxy systems address similar chemical resistance requirements to the Plasite range in high-aggression solvent and acid service.
RPM International’s scale provides Carboline with a global distribution and manufacturing infrastructure that smaller independent coatings suppliers cannot easily replicate. However, the tank coatings market remains specification-driven rather than price-driven at the premium end — creating competitive advantage for companies with deep technical support capability and long approval track records with major terminal operators and engineering procurement contractors.
Storage Terminals Magazine lists Carboline as a confirmed trade media advertiser, reflecting consistent marketing investment in the tank terminal sector and established relationships with procurement decision-makers across refinery and terminal operations globally.
What is Carboline’s Plasite tank lining used for?
Plasite is Carboline’s chemical-resistant tank lining range, designed for immersion service in chemical storage tanks, FRP vessels and secondary containment. Products such as Plasite 4110 and 9060 are specified where resistance to concentrated acids, caustics, solvents and hydrocarbons is required. They are commonly used in chemical terminals, refineries and industrial process facilities.
Is Carboline part of a larger company?
Yes. Carboline is a subsidiary of RPM International, a US-listed coatings and sealants group that generated approximately $7.3bn in revenue in fiscal year 2024. RPM’s industrial coatings portfolio also includes Rust-Oleum, Tremco and Dryvit. Carboline operates as RPM’s primary industrial protective coatings division.
How does Carboline compare to AkzoNobel and Jotun for tank coatings?
All three compete in the premium tank coatings segment. AkzoNobel’s Interline series and Jotun’s Tankguard range address similar crude oil and chemical storage applications. Carboline’s Plasite line is differentiated by its broad chemical resistance profile, making it a preferred specification for solvent and concentrated acid service. Competitive selection typically depends on owner-approved product lists and regional distributor strength.
What passive fire protection products does Carboline make?
Carboline’s Thermo-Lag range provides passive fire protection for structural steel, vessels and pipework in processing and terminal facilities. Thermo-Lag 3000 is an intumescent coating rated for hydrocarbon pool fire and jet fire scenarios, and is specified on LNG terminals, refineries and petrochemical plants globally.
What standards do Carboline tank coatings comply with?
Carboline tank linings are formulated and tested to AMPP (formerly NACE International) standards, including NACE SP0188 for holiday detection and project-specific API 653 maintenance requirements. Applicator qualification and inspection sign-off typically requires AMPP CIP Level 2 certified inspectors on tank lining installations.