High Heat Paint
High heat paint for protection from high temperatures
When a substrate is subject to heat and rapid, extreme temperature fluctuations, it can lead to surface breakage, coating failure and corrosion. Electrical and engine components, chimneys and ovens, pipework and chemical plants, all these are exposed to possibly damaging temperatures and conditions. A high heat paint (or high temperature paint) works to protect the substrate from fluctuation and extremes of temperature without losing functionality. High heat paints are commonly used for vehicles, but they have applications beyond engine-based ones in industry and CUI prevention. As well as protecting from heat, high heat paint:
- Reduces thermal fatigue: improve performance of machinery and extend part life
- Allows for higher operating temperatures while limiting thermal exposure
- Effective temperature range up to 1000°C: Different formulations provide resistance to heat from -200°C (-270°F) to 1000°C (1800°F)
- Abrasion resistant: Suitable for harsh environments
- Protects from corrosion under insulation (CUI): Provides an extra layer of protection between the hot surface and insulation
In this article we look at the different categories of high heat paint, how to choose the right one for your project, and where to find high temperature paint products and contractors in Canada.
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The 4 types of high temperature paint and coatings
It is important to note that while high heat paint does provide some protection from flames, it is not a fire resistant paint. Essentially, high temp paint can be divided into four types:
1. Epoxy-based, silicone-based, multi-polymeric paints – Single or two component, water- or solvent-based, high temp epoxy paint is formulated to provide resistance to high temperatures when applied at new construction, on-site and as a maintenance coating. Usually the more silicone, the higher the temperature resistance. For medium to high temperature protection. Liquid paints have the benefit of being able to be applied to hot substrates without affecting the coating.
2. High temp ceramic coating – The heat resistance properties of high heat ceramic paint are well known, and some of the highest heat paints available are ceramics. They also provide corrosion protection and chemical resistance and a hard, durable finish.
3. Powder coating – As well as being corrosion resistant, high heat powder coating has been developed for heat resistance to temperatures ranging from 200°C (392°F) to 550°C (1022°F). The powders are usually epoxy or silicone-based (like the liquid paints), and silicone-based powders perform better at higher temperatures. High temperature powder coating in general, has the benefit of being VOC free and having a wide range of available gloss and colour finishes.
4. Sprayed metal and metal additive coatings – These coatings are particularly used for corrosion protection combined with heat resistance. Thermal sprayed aluminium is particularly used for CUI prevention in onshore and offshore platforms and processing plants. Metal pigments are often used as stabilisers for temperatures above 400°C (752°F).
How to choose a high heat paint for your project
As with any coating application, understanding the needs of your substrate and the application process is crucial for making the right coating choice. As well as knowing the substrate type, you need to know its environment, its use, the coating time parameters, and the likely ways it will fail. Here are some questions you need to ask before you can choose a high heat coating:
- Maximum temperature of the substrate:
One of the most common reasons for failure is expecting these coatings to perform outside of the temperature range they were manufactured to tolerate. Each coating type has a specific temperature range, and outside it the functionality and efficacy fails. Make sure not to understate the maximum temperature.
For example, International Intertherm 50 is a high temperature paint recommended for temperatures up to 540°C (1004°F).
- Insulation of the substrate:
If you are choosing a coating to combat CUI, that coating needs to be specially formulated for the purpose. It needs corrosion resistance, but it also needs to be able to be applied to hot substrates and deal with boiling water exposure.
For example, PPG HI-TEMP 1027 is a special high heat paint designed to prevent CUI and can be applied to hot substrates
- Substrate temperature during application:
There are high heat paints formulated for hot (up to 300oC (572°F)) and room temperature application. A hot application may be required to avoid downtime, spot coating problem areas, and generally not disrupting a facility.
For example, Jotun Epoxy HR can be applied on substrates up to 150oC (302°F)
High temperature paint for metal combats CUI
Insulating metal structures is very common in industrial environments; it can minimise heat gain or heat loss, reduces costs, improves efficiency, and increases staff safety. The problem starts when water penetrates the insulation, collecting in the space between the insulation and the metal. When this happens it is the perfect environment for corrosion. The trapped moisture has the potential to cause rapid rusting and corrosion on the surface of the steel, below the insulation layer.
CUI is particularly insidious as it can go undetected under insulation until the problem is severe. If it remains undetected, it can lead to shutdown of an entire facility, or even safety incidents. This is why a high temperature paint for metal is so important – it can coat the steel or other metal surface and protect it from the hazard of corrosion under insulation.
High heat paint Canada – manufacturers & specialists
High temperature resistant paint is used across a wide range of industries, as well as by homeowners and barbecue enthusiasts. As such, a wide range of products and services are available across Canada, from Alberta to Ontario, no matter your province or project.
High temp paints for professional purposes should be applied by a trained professional. If you would like more information about high heat paint, or would like to connect with one of our partners to coat your project, contact us! Our experts are happy to help, just use the “request a quote” button below the article and make use of our 100% free quote service.
For information on where to find high heat powder coating, please visit our powder coating services page.