Heat resistant paint protects from extreme temperatures
When a substrate is subject to heat and rapid, extreme temperature fluctuations, it can lead to surface breakdown, 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 heat resistant paint (or thermal management coating) works to protect the substrate from fluctuation and extremes of temperature without losing functionality.
In this article we look at the different categories of heat resistant paint, how to choose the right one for your project, and where to find products and services in India. Let’s start with the top 5 advantages of heat resistant coatings:
- Effective temperature range up to 1000°C: Different formulations provide resistance to heat from -196°C to 1000°C
- Allowance for higher operating temperatures: while limiting thermal exposure
- Abrasion resistance: Suitable for harsh environments
- Reduction in thermal fatigue: improve performance of machinery and extend part life
- Protect from corrosion under insulation (CUI): Provides an extra layer of protection between the hot surface and insulation
Minimise the risk of CUI with heat resistant paint
Insulating metal structures is very common in industrial environments such as the Tata Steel manufacturing plants in Maharashtra and Pradesh; it minimises heat gain or heat loss, reduces costs, improves efficiency, and increases staff safety. The problems start when water penetrates the insulation, collecting in the space between the insulation and the metal. This provides a 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 heat resistant paint for steel is so important – it can coat the steel or other metal surface and protect it from the hazard of corrosion under insulation.
Tip: If you are looking for an Indian specialist applicator for heat resistant paint that prevents CUI, make sure to check for certification. For example SSPC (Society Surface Protective Coatings) India provides such certificates
The 4 most common types of heat proof paint
It is important to note that while heat resistant paints do provide some protection from flames, they are not fire resistant coatings. Essentially, heat proof paint types can be divided into four:
- Multi polymeric paints (epoxy or silicone based)
Single or two component, water- or solvent-based, these paints are formulated to provide resistance to high heat 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 for example on machinery parts. Liquid paints have the benefit of being able to be applied to hot substrates without affecting the coating.
- High temperature powder paint
As well as being corrosion resistant, heat resistant powder coating has been developed for heat resistance to temperatures ranging from 200°C to 550°C. The powders are usually epoxy and silicone-based (like the liquid paints), and silicone-based powders perform better at higher heats. These have the benefit of being VOC free and having a wide range of gloss and colour finishes.
- Thermal spray 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.
- Heat resistant ceramic paint
The heat resistance properties of ceramic coating are well known, and some of the highest heat coatings available are ceramics. They also provide corrosion protection and chemical resistance and a hard finish. With high temperature ceramic coating insulation and the metal under it can also be protected.
How to ensure choosing the right heat resistant paints
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 three factors that affect the choice of a high heat resistant coating:
1. 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 designed to prevent CUI and can be applied to hot substrates
2. Substrate temperature during application:
There are high temperature paints formulated for hot (up to 300oC) 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
3. 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. If you are looking for consumer products, make sure to choose for one that is meant for your application such as ‘heat resistant paint for silencer’.
For example, International Intertherm 50 is recommended for temperatures up to 540°C.
Industrial heat resistant paint India – Get in touch with suppliers
High temperature paints are 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 the country, no matter your project. Below is a table outlining some heat resistant paint manufacturers active in India.
|Berger Becker Coatings Pvt. Ltd.||D 58, Beside Lemken Factory, MIDC, Buttibori, Nagpur, Maharastra – 441122, India|
|Pragati Paints & Allied Products||No . 77, Jyotiba Nagar, Chikhali Road, Talawade, Pune, Maharashtra – 412114 – India|
|Star Paint & Oil Industries||Crescent Chambers, 56, Tamarind Street, Fort, Mumbai – 400023, India|
|Vivid India||B-16, Vivid House, Pushpanjali Enclave Pitampure, Delhi 110034, India|
|Macromol Products||Plot No. 47, Arignar Anna Industrial Estate, Mettukuppam, Vanafgaram, Tamil Nadu, Chennai – 600095, India|
Nothe that high temperature paints should be applied by a trained professional. If you would like more information about heat resistant paints, 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.