Chemical resistant coating – the solution against harsh substances
Nearly all coatings will be exposed to chemicals at some point, whether cleaning products, spills, or fumes. However most of these are mild, and the coating does not need a special formulation. Chemical resistant coatings or paints are designed to provide protection from the harshest of substances. They need to perform safely and consistently under punishing conditions, and so need to be highly resistant. Without proper chemical resistant coating, solvents, acids, alkalis, salts, and other substances can be absorbed by the substrate, causing deterioration and contamination.
The right chemical resistant coating is the one that satisfies the requirements of the chemical, as well as the needs of the substrate. Choosing correctly requires fully understanding both. In this article we will outline the different chemical resistant coatings options, and provide a guide for choosing the right one as well as where to find products and contractors in Pakistan.
Knowing the expectations helps define the chemical resistant coatings
Substrates and environments which require heavy duty protection from chemicals include flooring, storage or holding tanks, pipelines, bunds, buried metal and concrete structures, treatment plants, laboratories, cooling towers, factories, machinery and equipment, just to name a few.
The range of substrates, environments, and chemicals is matched by the range of chemical resistant coatings. To choose the right chemical resistant coating you need to know:
- Chemical type – each coating has different strengths, and may provide protection from one chemical but not another.
- Concentration of the chemical – the strength of the chemical will obviously affect the coating’s resistance.
- The temperature – a heated chemical adds an extra factor for the coating to deal with.
- Degree of exposure– will the substrate be immersed, or is it just contact exposure?
- Duration of the exposure – how long will the coating need to withstand the chemical?
Additionally, it is important to define any other beneficial properties the coating should have; these include for example high abrasion resistant in heavy duty ares, slip resistance on floors and stairs as well as excellent corrosion protection in highly corrosive environments.
The 4 most common options for chemical resistant coating
Chemical resistant coatings are available in a wide range of formulations, suited to different applications. The main types are polyurethane, epoxy, phenolic, and fluoropolymers. The choice of coating is further complicated by extra requirements such as high abrasion resistance, or sufficient lack of friction.
Option 1: Fluoropolymer
Chemical resistance: known for non-stick, but also highly resistant to a wide range of chemicals, including concentrated sulphuric, nitric, hydrochloric and phosphoric acids in temperatures up to 300°C
Applications: where a low coefficient of friction or a lubricious surface is required, for use on concrete or metal in secondary containment linings, acid plants, fertiliser plants, oil refineries, and more
Disadvantages: poor weather protection characteristics, and cannot withstand acetone, esters, ketones, and acetic acid
Option 2: Epoxy
Chemical resistance: protection against acids, alkalis, solvents, caustic fluids, fuels, fatty acids, salt or sugar solutions, chemical cleaning detergents and more
Applications: on concrete metal and wood; common on flooring in in the food and drink industry, garages, factories, and plants.
Disadvantages: tendency to weaken with high or fluctuating temperatures, lack of flexibility, not good with UV radiation (thus an indoor coating)
Option 3: Polyurethane
Chemical resistance: resistant to organic caustic fluids, acids and alkalis, fuel and hydraulic oils, and solvents.
Applications: where greater flexibility and ability to deal with high temperatures is needed, the preferred choice of chemical resistant coatings in the dairy industry (exposure to lactic acids)
Disadvantages: soft, likely to abrade, extremely sensitive to humidity during application, lower chemical resistance than epoxies have
Option 4: Phenolic
Chemical resistance: resist 98% sulphuric acid, hydrochloric acid, transmission fluid, gasoline, formaldehyde, phenol, and numerous other chemicals also in high temperatures
Applications: for tanks, ducts, piping, immersion service for most acids, solvents, and salts (chemical storage), flooring in healthcare, science, technology and electronics industries, as well as chemical and waste treatment plants, pulp and paper mills, and power generation plants
Disadvantages: non-resistant to some strong organic acids and solvents, and the less epoxy used in the makeup of the coating, the less resistant to chemicals it is
Chemical resistant coating Pakistan – Product overview
With so many different environments and surfaces that require chemical resistant coatings, it is no surprise that the range of products and services is extensive. There are the chemical coatings above, but there are also specially formulated coatings like methacrylate, which cures at low temperatures and is used for cold-store and freezer rooms. Below is a table outlining some of the available products, with price indications (subject to change and variation). It is these chemical coatings from reputable coatings manufacturers like AkzoNobel that installers trust.
|Chemical resistant coating type||Chemical resistant coatings product||Product suitability|
|Two component epoxy||Jotun Jotafloor Topcoat||Ideal for industrial floors, laboratories, hospitals, food and beverage plants, kitchens, warehouses, factories, and manufacturing facilities.|
|Two component polyurethane topcoat||Rust-Oleum 9600 Rust-O-Thane Polyurethane||Heavy industrial and marine exposures, moist conditions and high abrasion and impact situations. Especially recommended for weather resistance.|
|Two component epoxy phenolic||International Interline 850||Tank and pipe lining for steel storage tanks and pipes containing a range of products including crude oil, gasoline, caustic solutions, potable water, and solvents.|
|Two component epoxy novolac||Sherwin-Williams Nova-Plate 325||For use on steel and masonry surfaces in industrial and marine environments such as oil storage tanks, secondary containment, ethanol storage tanks, and more.|
|Two component novolac vinyl ester||International Interline 955||Reinforced with glass flake to increase chemical and abrasion resistance. Intended for use in internal lining of chemical storage tanks and vessels for hot media (up to 90°C) or acids.|
Chemical resistant paint manufacturers and installers in Pakistan
A chemical resistant coating should be applied by a trained professional to ensure an effective and flawless application. Fortunately there are many coating installer companies operating across Pakistan. If you have a project that needs chemical resistant coating, our experts are here to help! In cooperation with our partners we can provide you with a tailor-made quote, and connect you with the right coating solution. Just get in touch via e-mail or the “Request a quote” button at the bottom of this article.
Here below is a list of coating manufacturers located in Pakistan offering chemical resistant coatings.
|Chemical resistant coating manufacturer||Address (Pakistan)|
|Jotun Pakistan (Pvt.) Ltd.||2 KM Defence Road, off 9 Km Raiwind Road,، Defence Road, Lahore, Punjab 54770|
|AkzoNobel Pakistan||346, Ferozepur Road, P O Box 273, Lahore 54600|
|Hempel Marine and Commercial Services (Pvt) Ltd.||9C First Commercial Lane Zamzama,, Phase 5, D.H.A., Karachi 75600|
|Berger Paints Pakistan||Street 36, Quaid-e-Azam Industrial Estate Quaid e Azam Industrial Estate, Lahore, Punjab|
|Kansai Paint||11 – CCA, Phase V, Defense Housing Authority, Lahore|