6 Best Coating Suppliers for Severe Chemical Service: Smelters, Battery Recycling and Vessels

Severe Chemical Service Coating Suppliers: Key Points

• Six suppliers for severe chemical service on steel: Polylloy Coatings, Carboline, Hempel, Chesterton, Belzona and Sauereisen.
• Mild service is not a fit for any of them: where steel is dry and chemical-free, a conventional coating is adequate and usually cheaper.
• CorrosionGard®-160S cures at ambient temperature, is rated to 160 °C (320 °F), is immersion-rated and covers structures, vessels and tanks.
• At battery recycling plants and smelters, split zones: gas-path ducts and filters need a flue gas grade; structures and vessels suit ambient-cure, vinyl ester or epoxy novolac systems.
• Coatings blister when salts or particles sealed under the film draw in moisture by osmosis; salt testing and clean blasting prevent most failures.
• Pricing is project-specific; compare chemical data in your real media, cure needs and preparation grade on the same scope.

Six suppliers cover severe chemical service on steel: Polylloy Coatings with ambient-cure CorrosionGard-160S (to 160 °C, immersion-rated), Carboline Plasite 4301 HT, Hempel Hempaline Defend 740, Chesterton ARC S4+(E), Belzona 4341 and Sauereisen epoxy novolak linings. Match chemical data, temperature and cure to each zone; in mild service a conventional coating is adequate.

Severe Chemical Service Coating Suppliers and When a Conventional Coating is Enough

Severe chemical service coating suppliers manufacture coatings and linings that protect steel structures, vessels and process equipment from acid gas, acid condensate, chemical splash, fume and immersion, often combined with heat and dust. This list covers that duty at smelters, battery recycling plants and chemical plants, where a general-purpose industrial paint system fails early.

Mild Service is Not a Fit

In mild service, such as dry indoor steel, light atmospheric exposure and no acid gas or chemical contact, a conventional coating system is adequate and usually the lower-cost choice. Every product below is specified for harsher duty than that. Tank and vessel interior linings are compared in depth in the chemical tank lining comparison.

Selection Criteria for a Severe Chemical Service Coating Supplier

Each chemical service coating supplier was assessed against five neutral criteria:

• Chemical resistance: published data for the plant's actual media and concentrations, with the test method named.
• Temperature: published dry and wet or immersion limits.
• Cure route: ambient cure, or a forced or heat cure the data sheet calls for.
• Surface preparation: the blast grade required and tolerance of contaminated surfaces.
• Application model and transparency: who applies and inspects, and how complete the data sheet is.

Every product fact below is taken from the maker's own current data sheet or product page.

Chemistry Families in This List

The list spans a hybrid coating (Polylloy), novolac epoxy vinyl ester and novolac vinyl ester glass-flake linings (Carboline, Hempel), reinforced epoxy novolac (Chesterton, Sauereisen) and an inorganic-acid barrier coating (Belzona). Chemistry differences are explained in novolac, vinyl ester and hybrid coatings compared.

Severe Chemical Service Coating Suppliers at a Glance

The table summarizes the six suppliers in the order they are described. "See data sheet" means the maker's page publishes no value.

Polylloy Coatings: CorrosionGard-160S Ambient-Cure Coating for Structures and Vessels

Polylloy Coatings supplies CorrosionGard-160S for chemical duty on steel that never sees process heat.

Suited To

Internal and external surfaces of steel structures and vessels in metal smelters, cement plants and waste incinerators, power and refinery equipment, and storage tanks and pressure vessels handling corrosive gases and chemicals, within 160 °C (320 °F), per the 2025 bulletin.

What It Is

Polylloy Coatings is a research and development (R&D) and manufacturing company in California's San Francisco Bay Area that formulates hybrid polymer-alloy-ceramic coatings. CorrosionGard-160S is its two-component, single-layer corrosion protection system for hot structural steel; it cures at room temperature, so no start-up heat is needed.

Polylloy formulates, supplies, specifies, trains and supervises; trained partners apply. Grade details are on the CorrosionGard ambient-cure coating page.

Key Features

• One-week immersion weight gain below 0.5 % in 10 % hydrochloric acid (HCl), 54 % phosphoric acid (H3PO4), 10 % sulfuric acid (H2SO4) and water (ASTM D471).
• Shore D above 80, Taber abrasion below 100 mg, adhesion to steel above 2,000 psi (ASTM D4541), and 0 mm corrosion after more than 24 months of acid and salt spray weathering.
• Single coat of 20 to 30 mils (0.5 to 0.75 mm), maximum 60 mils, by spray, roll or brush; zero % volatile organic compounds (VOC) as supplied.
• Society for Protective Coatings (SSPC) SP10 near-white blast with a profile above 3.0 mils (75 µm); immersion-rated and resistant to severe dust abrasion.
• Formulated to perform where steel is exposed to airborne contamination during preparation and application.

Cost Factors

CorrosionGard-160S cost is project-specific: steel condition, preparation and access, area and thickness, partner labour, inspection, freight and shutdown timing. Ambient cure removes cure-energy planning.

Pros and Cons

Pros

• Ambient cure for steel that never sees process heat; single coat.
• Published acid immersion data with test standards; internal and external surfaces.

Cons

• 160 °C (320 °F) ceiling, so hotter gas-path zones need a higher-rated FlueGard® grade.
• Chemical resistance is published for four media only; other chemicals need evaluation by Polylloy's technical team.
• SSPC-SP10 blasting is required; not a replacement for acid brick or refractory.

Carboline: Plasite 4301 HT Glass-Flake Novolac Epoxy Vinyl Ester

Carboline's Plasite 4301 HT spans both tank linings and structural steel.

Suited To

Extreme chemical exposure on steel or concrete: immersion tank linings plus splash, spill and fume exposure on structural steel, per the Plasite 4301 HT product data sheet.

What It Is

Plasite 4301 HT is a glass-flake-filled novolac epoxy vinyl ester coating from Carboline's Plasite line, resistant to organic and inorganic acids, most alkalies and many solvents.

Key Features

• Data sheet uses: steel tank and vat linings, secondary containment, structural steel, process floors, grating, sumps, trenches, scrubbers and clarifiers.
• Dry temperature resistance of 177 °C (350 °F) continuous and 204 °C (400 °F) non-continuous.
• SSPC-SP10 with a minimum 3.5 mil profile for immersion.

Cost Factors

Plasite 4301 HT cost is project-specific, set by system build, preparation, access, required cure conditions and outage length.

Pros and Cons

Pros

• One product covers tank linings and structural steel splash and fume duty.
• Published dry temperature limits.

Cons

• Separate cure periods are specified for splash and for immersion service, which affects outage planning.
• Check the chemical resistance guide for each medium.

Hempel: Hempaline Defend 740 Novolac Glass-Flake Vinyl Ester Lining

Hempel positions Hempaline Defend 740 as a lining for acidic vessel service.

Suited To

Internal lining on steel or concrete for chemical storage tanks and vessels where acidic environments at elevated temperatures and pressures occur, including oil and gas service, per the Hempel product page.

What It Is

Hempaline Defend 740 is a sprayable novolac glass-flake vinyl ester tank lining in Hempel's Hempaline Defend range.

Key Features

• Stated resistance to organic and inorganic acid solutions, high temperatures and abrasion.
• The Hempaline Defend brochure also lists flue gas desulfurization (FGD) units: gas-gas heaters, absorber outlet ducting and chimney flues.

Cost Factors

Hempaline Defend 740 is quoted per project; lining build, access and outage length drive the figure.

Pros and Cons

Pros

• Designed for acidic, elevated-temperature vessel service.
• FGD duty also named in the maker's brochure.

Cons

• No numeric temperature limit on the product page.
• A lining for vessel interiors rather than a coating for structural steel.

Chesterton: ARC S4+(E) Reinforced Epoxy Novolac for Chemical Immersion

Chesterton offers ARC S4+(E) as a thin-film coating for chemical immersion.

Suited To

Equipment and structures exposed to extreme chemical attack in immersion: chemical storage tanks, tank linings, exhaust gas ductwork, heat exchangers, fans and housings, chimneys and stacks, per the ARC S4+(E) datasheet (02-2025).

What It Is

ARC S4+(E) is a 100 % solids, reinforced thin-film epoxy novolac coating in Chesterton's ARC industrial coatings range.

Key Features

• Typically a two-coat system at a nominal 375 µm (15 mils) per coat, by brush, roller, airless or plural-component spray.
• Maximum temperature, dependent on service: 50 °C wet and 110 °C dry, as printed on the datasheet.
• Spark testable per NACE SP0188; permeation resistant; resists concentrated chemicals.

Cost Factors

ARC S4+(E) cost is project-specific, with the two-coat build and inspection stages as main drivers.

Pros and Cons

Pros

• Thin-film, multi-substrate system covering immersion, ductwork and fans.
• Holiday-testable.

Cons

• The lowest published limits among entries that publish a figure, so hot gas-side equipment at battery recycling and smelter plants needs a higher-rated product.
• Two coats to apply and inspect.

Belzona: Belzona 4341 (Magma CR4) Barrier Coating for Hot Inorganic Acids

Belzona targets Belzona 4341 at hot inorganic acid exposure.

Suited To

Areas exposed to hot inorganic acids such as sulfuric and hydrochloric acid: acid retaining walls, chemical drains and channels, transfer and holding areas, pump bases and casings, tank pads, walkways and tanks, per the Belzona 4341 product data.

What It Is

Belzona 4341 (Magma CR4) is a two-component barrier coating for surfaces subject to chemical attack, specifically inorganic acids. It bonds to metals, concrete, fiberglass and brick.

Key Features

• Suitable for immersion temperatures up to 90 °C (194 °F).
• Fast curing, seamless monolithic finish with no solvent vapours.

Cost Factors

Belzona 4341 cost depends on the area, preparation and access of each containment or tank project.

Pros and Cons

Pros

• Aimed at hot sulfuric and hydrochloric acid exposure.
• Works over metal, concrete and brick, useful for containment areas and repairs.

Cons

• The downloadable product data file is undated, so confirm data on the current Product Specification sheet.
• Organic chemicals need the maker's confirmation.

Sauereisen: ConoGlaze and FibreCrete Epoxy Novolak Linings for Acid Exposure

Sauereisen covers acid exposure with several epoxy novolak linings rather than one product.

Suited To

Concrete and steel in processing and storage areas exposed to sulfuric acid, strong oxidizers and, for one grade, hydrofluoric acid, plus immersion service in tanks, ducts and scrubbers, per Sauereisen's linings page.

What It Is

Sauereisen supplies epoxy and epoxy novolak coatings and linings, chemical-resistant mortars and refractories. This entry covers three of its current linings.

Key Features

• ConoGlaze Epoxy Novolak 228: resists strong oxidizers and sulfuric acid.
• ConoGlaze Epoxy Novolak (Carbon Filled) 228C: formulated to resist hydrofluoric acid.
• FibreCrete Tank Lining 215TL: fiber-reinforced epoxy for immersion service in concrete and steel tanks, ducts and scrubbers.

Cost Factors

Sauereisen lining cost is project-specific and follows lining build, substrate and access.

Pros and Cons

Pros

• A dedicated hydrofluoric acid grade where fluorides are present.
• Concrete and steel covered by one supplier.

Cons

• Temperature limits sit in individual technical data sheets.
• The range leans toward concrete, so confirm steel-specific data.

Battery Recycling and Smelter Equipment: Matching Coating to Zone

Battery recycling and smelter equipment splits into two coating zones.

Gas-Path Equipment

Battery recycling plants and lead, zinc or copper smelters run acid gas through ducts, filters and stacks. The FlueGard-225SQC bulletin lists ducts, filters and stacks in copper, zinc or lead smelters and battery recycle plants, rated to 225 °C (437 °F), resistant to sulfur trioxide (SO3), sulfur dioxide (SO2), HCl and hydrogen fluoride (HF), and immersion-rated.

For that grade, final heat cured activation is completed during start-up using process heat. Polylloy has also published a 56% sulfuric acid immersion test on FlueGard-225SQC.

Structures, Vessels and Tanks

Structural steel, platforms and vessels around furnace and refining areas see acid fume, splash and dust without process heat. The CorrosionGard-160S bulletin lists steel structures and vessels in metal smelters; vinyl ester and epoxy novolac systems from this list also fit this zone.

Keep zones separate in the specification: the right product for a duct is rarely the right product for a platform.

Salt Contamination and Osmotic Blistering on Structural Steel

Salt contamination and osmotic blistering start before the first coat is applied.

Why Coatings Blister

Soluble salts and airborne particles left on blasted steel are sealed in by the coating. The CorrosionGard-160S bulletin describes the result: the contamination swells by osmosis and forms blisters that lead to cracks and delamination. The same bulletin notes that structural steel in industrial and marine environments is always exposed to airborne contamination during surface preparation.

How Salt Contamination Affects Adhesion

Salt at the steel interface weakens adhesion and drives under-film corrosion that spreads from the blister. Test blasted steel for soluble salts before coating, using the method and acceptance level in the project specification, and wash or re-blast where limits are exceeded.

Product choice is the second line of defence: a contamination-tolerant product such as CorrosionGard-160S helps, but surface preparation still decides performance. Build salt testing into planning a coating outage.

How These Six Chemical Service Coating Suppliers Were Chosen

Five established manufacturers of chemical-resistant linings and coatings for steel were checked against their own current product sheets in October 2026. All 5 name chemical immersion, acid exposure or chemical vessel service, giving 6 suppliers with Polylloy Coatings.

Each was checked against the 5 criteria on 12 October 2026. Polylloy publishes this page and is listed first on fit to ambient-cure structural steel and vessel duty; a broader view is in the industrial coating manufacturers list.

How to Choose a Coating Supplier for Severe Chemical Service

Choosing a severe chemical service coating supplier starts with the zone, not the brand.

Decide by Zone and Duty

First confirm the service is severe; if it is mild, use a conventional system. Then split the plant into zones: hot gas path (FlueGard grades), ambient structures and vessels (CorrosionGard-160S or a vinyl ester or epoxy novolac system), tank interiors, and acid containment floors and walls.

Ask each supplier for chemical resistance data in your actual media, the cure the sheet requires and the surface preparation grade, and compare on the same scope.

Cost and Next Step

Pricing depends on the operating environment, selected coating system, equipment condition, project size and application requirements. Lifecycle evaluation weighs preparation, application, maintenance, downtime and replacement alongside material cost. Share equipment type, coated area, temperature, chemicals and concentrations, gas chemistry, abrasion, location and outage timing, and book a Coating Performance Review.

FAQs

What is an Ambient Cure Coating for Structural Steel?

An ambient cure coating hardens at room temperature after application, so it needs no process heat or heaters to reach service condition. CorrosionGard-160S is a two-component ambient-cure coating for hot structural steel, rated to 160 °C (320 °F) and immersion-rated, suited to structures, platforms and vessels.

Which Coating Protects Structural Steel in a Chemical Plant?

Structural steel exposed to acid fume, splash or spill can be protected with a hybrid coating such as CorrosionGard-160S, a glass-flake novolac epoxy vinyl ester such as Plasite 4301 HT, or an epoxy novolac system. Choose on published resistance to the plant's actual chemicals, temperature limit and preparation needs. Where exposure is mild, a conventional system is adequate.

How Do You Protect Battery Recycling Equipment from Corrosion?

Protect battery recycling equipment zone by zone. Ducts, filters and stacks carrying acid gas need a flue gas grade such as FlueGard-225SQC, whose bulletin lists battery recycle plants, rated to 225 °C (437 °F). Structures and vessels without process heat suit an ambient-cure coating or a vinyl ester or epoxy novolac lining.

How Does Salt Contamination Affect Coating Adhesion?

Soluble salts left on blasted steel weaken the bond between coating and steel. Water that permeates the film is drawn toward the salts by osmosis, building pressure that lifts the coating into blisters and starts corrosion beneath it. Testing blasted steel for soluble salts and washing or re-blasting where limits are exceeded prevents most of these failures.

Why Do Coatings Blister on Structural Steel?

Coatings on structural steel usually blister because salts or particles were trapped under the film during surface preparation. Moisture drawn in by osmosis forms blisters that lead to cracks and delamination. Clean, salt-tested steel at SSPC-SP10, the right film thickness and a contamination-tolerant product such as CorrosionGard-160S reduce the risk.

When is a Conventional Coating Good Enough Instead of a Severe-Service Coating?

A conventional coating is good enough in mild service: dry indoor steel, light atmospheric exposure and no acid gas, condensate or chemical contact. There it is adequate and usually cheaper. Severe-service coatings earn their place where acids, chlorides, heat or immersion attack the steel.

Who Applies CorrosionGard-160S?

Trained application partners apply CorrosionGard-160S. Polylloy Coatings formulates and supplies the coating, writes the specification, trains the partner and supervises the work, including surface preparation to SSPC-SP10 and inspection. Because it cures at ambient temperature, the coating can be inspected for thickness and integrity and repaired before the equipment returns to service.