Does your site handle acids, alkalis, solvents, or other process chemicals that could damage floors, tanks, or structural steel if they ever escaped containment? A chemical resistant coating is the barrier layer that stops that damage happening, applied over concrete, steel, or fibreglass so the chemical never reaches the material underneath.
We set out what chemical resistant coatings are, the main types you’ll come across, and the industries that rely on them.
What Makes a Coating “Chemical Resistant”?
Most chemical resistant coatings work the same basic way. A liquid resin, typically epoxy, polyurethane, or vinyl ester, is applied and then cures into a hard, cross-linked polymer layer. Once cured, that layer is largely non-reactive and very low in porosity, so it forms a physical barrier that stops acids, alkalis, and solvents soaking through to the concrete or steel beneath.
The resistance comes from the chemistry of the cured resin itself, not an additive. Epoxy resins resist a broad range of chemicals reasonably well; vinyl ester resins are generally rated higher again against strong acids and alkalis, because their molecular structure is less prone to breaking down under prolonged exposure. This is why no coating is simply “chemical resistant” without qualification: it always depends on which chemical, at what concentration, and for how long.
What Types of Chemical Resistant Coatings Are There?
You’ll typically see three or four resin families discussed for this kind of work:
- Epoxy coatings are the most common starting point, offering good all-round protection against oils, mild acids, and cleaning agents.
- Epoxy novolac coatings are a more heavily cross-linked version of standard epoxy, formulated to cope with stronger and more concentrated chemicals where a standard epoxy would degrade faster.
- Polyurethane coatings tend to be chosen where flexibility and abrasion resistance matter alongside chemical resistance, such as areas with regular foot or vehicle traffic.
- Vinyl ester coatings are usually reserved for the toughest environments, particularly tanks or linings in constant contact with strong acids or alkalis, because they generally offer stronger resistance under sustained exposure than standard epoxy.
Exactly which system suits your site depends on the chemicals involved and how they’re used, so this is a conversation for whoever is specifying or applying the coating, not something to guess from a data sheet alone.
Which Industries Actually Need This?
Chemical resistant coatings turn up wherever process chemicals are stored, handled, or produced:
- Chemical and petrochemical plants use them on tanks, bunds, and pipework.
- Tank farms and bulk storage sites rely on them to protect vessels holding concentrated liquids over long periods.
- Food and beverage producers use them on floors and walls to withstand the caustic cleaning agents used in daily wash-downs.
- Wastewater treatment facilities need coatings that cope with sustained exposure to chlorine compounds.
- General manufacturing sites tend to use them more selectively, around specific areas such as spray booths or metal finishing lines rather than across the whole building.
What Chemicals Do These Coatings Actually Resist?
This varies by product and manufacturer, which is why it’s worth treating resistance claims with some caution rather than taking a single figure as gospel. As a general pattern, cured epoxy and vinyl ester systems can hold up well against acids, alkalis, salts, oils, and many solvents, with some formulations rated for concentrated acids such as sulphuric acid depending on the exact product.
Performance at a given concentration, temperature, and exposure time varies between products, which is where the choice between epoxy, novolac, and vinyl ester actually matters. If a supplier gives you a resistance chart, check whether it reflects splash and spillage or constant immersion, because a coating can perform very differently under each.
Concrete, Steel, or Something Else? Get the Substrate Right First
The right coating also depends heavily on what it’s going onto. A concrete factory floor, a steel tank, and a fibreglass vessel all need different surface preparation and, often, different resin systems to bond and perform properly. If your main concern is protecting a factory or warehouse floor specifically, we’ve covered that ground in more depth in our guide to epoxy floor coatings for industrial and commercial environments. If it’s a storage vessel or process tank that needs lining, our separate guide to tank lining and storage tank coatings goes into how those systems are chosen and applied.
What Should You Tell Your Contractor Before They Quote?
Most information on chemical resistant coatings comes from manufacturers describing their own products. Harder to find is guidance on what a facility manager needs to work out before appointing someone to apply one. In practice, a contractor needs to know: which chemicals will be present and at what concentration, whether exposure is occasional or constant immersion, the typical operating temperature, the condition and age of the substrate, and how much downtime the site can allow for preparation and curing. Getting these details wrong at the specification stage is one of the most common causes of premature coating failure, regardless of which resin is chosen.
How Long Do Chemical Resistant Coatings Last?
There’s no single honest answer here. Lifespan depends on the coating system, the substrate, how well it was prepared and applied, and how aggressive the daily chemical exposure actually is. A well-specified system on a properly prepared surface will generally outlast one chosen without regard to the site’s real operating conditions, but anyone quoting a blanket figure for “how long it lasts” without knowing your chemicals, concentrations, and exposure pattern is guessing.
Getting the Specification Right
Chemical resistant coatings are a broad category, and the right choice for a storage tank is rarely the right choice for a food production floor. If you’re weighing up options for your site and want an honest review on what’s actually needed, Halls Decorators offers free site surveys across Yorkshire, Lancashire, and Greater Manchester. Call 0800 567 7959 to talk through what your facility handles and what that means for the coating you specify.