# How to Choose an Industrial Coating Company for Severe Service Choose an industrial coating company by testing its evidence against your conditions: grade-by-grade service limits, datasheets with named test methods, documented performance in comparable service and a verifiable ISO 9001 quality system. Add a clear model for who applies, who supervises and what inspection records you receive. **Category:** Articles **Written by:** Edita Rojasova **Last updated:** Oct 6, 2026 **Source:** https://signals.polylloycoatings.com/articles/industrial-coating-supplier-checklist --- ## Coating Supplier Checklist: Key Points - Start with your service conditions: temperature (continuous and excursions), gas or process chemistry, condensation, abrasion, cycling and outage window. - Require grade-by-grade service limits and datasheets that name their test methods, not one temperature for a whole product family. - Ask for documented field performance in comparable service, with operating conditions and inspection results, and check whether each reference is completed or only proposed. - Verify the quality system: ask for the ISO 9001 certificate, its scope and who issued it; Polylloy holds ISO 9001:2015 registration, with an independent third-party design and manufacturing verification by Fuller, Jones & Associates. - Clarify who applies, who supervises and what inspection records you will receive. - Compare cost on the same equipment, conditions, scope and period, and treat absolute promises as a warning sign. Choose an industrial coating company by testing its evidence against your conditions: grade-by-grade service limits, datasheets with named test methods, documented performance in comparable service and a verifiable ISO 9001 quality system. Add a clear model for who applies, who supervises and what inspection records you receive. Industrial coating supplier evaluation, for severe service, means holding every supplier's claims against your equipment's real temperature, chemistry and abrasion rather than against its brochure. Compare cost on a lifecycle basis, not on material price. The method below works for any supplier; Polylloy Coatings is used as the worked example because its own data is the data this page can state accurately. ## What to Look for in an Industrial Coating Company An industrial coating company for severe service should be able to show, in writing, that a specific grade fits your specific conditions and that the result can be applied, inspected and maintained. For a plant manager, the goal is a decision that survives internal approval and still looks right at the next outage inspection. The evaluation breaks into eight checks, covered in order below: written service conditions, published service limits, test data with named methods, field performance in comparable service, the quality system, the application and supervision model, honesty about limits, and lifecycle cost. ## Define Your Service Conditions Before Talking to Suppliers Service conditions are the reference every supplier claim is tested against, so document them before the first meeting. Without a written conditions sheet, each supplier answers a different question and the quotations cannot be compared. ### Conditions to Document A useful conditions sheet records the operating envelope and the constraints around it: - Continuous operating temperature, excursions and start-up behavior - Gas or process chemistry, and where condensation can occur - Abrasion from particulate, flow velocity and impingement points - Thermal cycling: frequency of start-stops and load swings - Equipment condition, access and the outage window - The alternative under consideration, [such as 316 stainless steel](https://signals.polylloycoatings.com/comparisons/carbon-steel-vs-stainless-steel) ### Why the Conditions Sheet Comes First The minimum temperature often matters more than the maximum. In flue gas service, many of the most damaging failures start where steel runs below the acid dew point at low load, not at the hot end. A supplier who asks about your coldest operating case before your hottest is reading the problem correctly. ## Check That Products Are Matched by Published Service Limits A credible coating supplier publishes a service limit for each grade, not one temperature for a whole product family. Grade-level limits let you match a product to each zone of a plant and see where one grade stops and another must take over. ### Ask for Limits Grade by Grade Polylloy's range shows what grade-level limits look like. - CorrosionGard®-160S, rated to 160 °C (320 °F) - [FlueGard®-225SQC](https://www.polylloycoatings.com/fluegard), rated to 225 °C (437 °F) - StackGard®-255SQW, rated to 255 °C (491 °F) - FlueGard-425S, rated to 425 °C (797 °F) - FlueGard-455CHT, rated to 455 °C (850 °F) - KilnGard®-600SCW, rated to 600 °C (1,112 °F) - WearGard®-625S, rated to 625 °C (1,157 °F) Ask every supplier how excursions above the continuous limit are handled; FlueGard-425S, for instance, is stated at 425 °C with spikes to 500 °C (932 °F). ### Check Consistency Across Documents The website, the datasheet and the proposal should state the same limit for the same grade. An inconsistency is not proof of a problem, but it is a question to raise before purchase. ## Ask for Test Data with Named Test Methods Test data is only comparable when it names the standard used, because two suppliers can report the same property measured in different ways. Insist on datasheets that tie each value to a test method, usually an ASTM International standard. ### What a Usable Datasheet Looks Like The FlueGard-455CHT bulletin is a practical example of the format: - Elcometer adhesion above 1,000 psi (7 MPa) on sandblasted carbon steel (per the FlueGard-455CHT data sheet) - Taber abrasion of 20 mg (ASTM D4060) - Shore D hardness above 80 (ASTM D2240) - Surface preparation to SSPC-SP10 (Society for Protective Coatings) near-white blast with a profile greater than 3 mils ### Test the Failure Modes That Matter Heat resistance alone says little about how a coating fails. Ask what testing shows about adhesion loss and corrosion creeping under the film from a defect. Polylloy laboratory and field testing comparing FlueGard with conventional high-temperature coatings observed undercutting corrosion and delamination in the conventional coatings, which is why those two failure modes belong on your question list for every supplier. ### Limits of Laboratory Data Laboratory results indicate properties under controlled conditions. Field evidence in comparable service shows performance, and the two should be read together. ## Demand Documented Field Performance in Comparable Service Documented field performance is among the strongest evidence a coating supplier can offer, provided the service is genuinely comparable to yours. A reference from a cool, dry duct says little about a hopper wet with chloride condensate. ### What Good Field Evidence Contains Good evidence names the equipment, temperature, chemistry, time in service, inspection findings, and who applied and supervised the work. Polylloy draws its performance claims from completed projects, case studies and partner websites, and its technical team provides further detail for the project under review. ### Completed Versus Proposed References Check whether each reference is completed or only proposed. Polylloy describes its [SUEZ Taden Incinerator (France) hopper project](https://signals.polylloycoatings.com/use-cases/waste-to-energy-plant-corrosion) as a proposed application supported by a comparable sister-plant reference, not a completed result. Any supplier should draw the same line. ### Track Record, Scoped Correctly A track record claim should be scoped to the technology it describes. FlueGard-225 was formulated in 2000, with first field applications around 2002, giving over 20 years of field performance for that technology. Polylloy's named customers include CEMEX, Holcim and Exxon. ## Verify the Quality System: ISO 9001 and Third-Party Validation ISO 9001 is the International Organization for Standardization (ISO) standard for quality management systems; certification means a supplier's processes, such as document control, process control and corrective action, have been audited against it. It does not certify that a coating will perform in your service, so treat it as a baseline for consistency rather than as performance evidence. ### What to Request Ask for the certificate itself, its scope, the auditing body and its validity. Check that the scope covers the manufacture of the products you are buying, not only a sales office. ### Polylloy's Quality System Polylloy Coatings holds ISO 9001:2015 registration, valid to July 2027, covering research, formulation, manufacture, specification, field technical support and contractor training, and an independent third-party design and manufacturing verification by Fuller, Jones & Associates based on a review of that documentation. Its portfolio spans 9 technologies across 5 product families, which are introduced on the [corrosion protection solutions](https://www.polylloycoatings.com/corrosion-protection-solutions) page. ## Understand Who Applies the Coating and Who Supervises The application and supervision model decides whether a good product becomes a good coating. Ask four questions of every supplier: who prepares the surface and applies the coating, who supervises, what inspection and test plan with hold points you will receive, and how the crews are trained. At Polylloy, [certified partners apply the coatings](https://signals.polylloycoatings.com/articles/industrial-coating-contractors), while Polylloy formulates, supplies, specifies and supervises. Post-application follow-up is covered by [inspection and maintenance support](https://www.polylloycoatings.com/industrial-inspection-maintenance-services). ## Test the Supplier's Honesty About Limits A credible coating supplier tells you where its product does not fit. Expect plain statements such as: a coating does not replace refractory, surface preparation is critical, and heat-cured grades need start-up heat. For Polylloy's heat-cured grades, final heat cured activation is completed during start-up using process heat. Warning signs run the other way: absolute promises about service life or freedom from maintenance, one product offered for every temperature and chemistry, and warranty talk without written scope, duration and conditions. ## Compare Cost on a Lifecycle Basis Lifecycle cost is the right basis for [comparing coating suppliers](https://signals.polylloycoatings.com/listicles/industrial-coating-manufacturers), or a coating against an alloy. Pricing depends on the operating environment, selected coating system, equipment condition, project size and application requirements, so compare the same equipment, conditions, scope and period. Separate material cost, installed cost and lifecycle cost in every quotation. Protected carbon steel may offer a cost-effective alternative to stainless steel where the coating is suitable for the specified service conditions. ## Supplier Evaluation Checklist: Evidence to Request A supplier evaluation checklist turns the eight checks into a request list. Send it with your conditions sheet and score each reply against the right-hand column. | Evidence | Why it matters | What good looks like | | --- | --- | --- | | Written service conditions | Makes replies comparable | Minimum, normal and excursion cases | | Service limit per grade | Matches grade to zone | One limit per grade, consistent | | Datasheets with test methods | Makes data comparable | Each value tied to a standard | | Failure-mode test evidence | Shows how it fails | Adhesion and undercutting addressed | | Field references | Shows real performance | Comparable service, completed, inspected | | ISO 9001 certificate | Confirms audited quality system | Scope, auditor and validity stated | | Third-party validation | Independent check | Validating body named | | Application and supervision model | Controls workmanship | Inspection and test plan with hold points | | Warranty terms, where offered | Defines recourse | Written scope, duration, conditions | | Itemized quotation | Exposes exclusions | Material, installed, lifecycle separated | To test Polylloy against this list for your equipment, [request a coating evaluation](https://www.polylloycoatings.com/contact) with the equipment type, coated area, operating conditions, location and timing. ### FAQs **What Evidence Should I Ask an Industrial Coating Supplier For?** Ask for grade-specific datasheets with named test methods, the service limit for each grade and documented field performance in comparable conditions. Add the ISO 9001 certificate with scope and auditor, the application and supervision model with an inspection and test plan, and written warranty terms where a warranty is offered. **Does ISO 9001 Certification Mean a Coating Will Perform in My Plant?** No: ISO 9001 certification shows that the supplier's quality management system, including document control, process control and corrective action, has been audited against the standard. It does not test the coating in your service. Pair it with test data using named methods and field evidence from comparable temperature, chemistry and abrasion conditions. **How Do I Verify a Coating Supplier's Field Performance Claims?** Ask for the operating conditions, equipment, time in service and inspection findings behind each claim, and confirm whether the project is completed or only proposed. Case studies, partner documentation and discussions with the supplier's technical team about comparable projects are stronger evidence than general website statements. **Should the Coating Supplier Also Apply the Coating?** Not necessarily; what matters is a clear split of responsibilities and qualified supervision, since many coating manufacturers supply material that independent or approved applicators install. Polylloy works through certified partners: the partner prepares and applies, while Polylloy formulates, supplies, specifies and supervises. Whatever the model, confirm who signs off each inspection hold point. **How Do I Compare Quotations from Different Coating Companies Fairly?** Compare the same equipment, operating conditions, scope and evaluation period. Separate material cost from installed cost, which adds surface preparation, application, inspection and mobilization, and from lifecycle cost, which adds maintenance, downtime and replacement. Ask each supplier to itemize so exclusions are visible. **Which Customers Can Polylloy Name as References?** The customers Polylloy names publicly are CEMEX, Holcim and Exxon, each cleared for publication. For project-specific references in operating conditions similar to yours, Polylloy's technical team works with the buyer to provide performance details for the project under review, subject to customer confidentiality.