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What Is the Best Paint for Steel?

Coating is a process that paints layers of organic materials on the base metal. It makes the metal attractive and corrosion-resistant. Generally, the painting thickness is 10+5 µm (top painting + back painting). It can be customized to 35 µm for special requirements. There are four commonly-used coatings, including polyester (PE), silicone modified polyester (SMP), high durability polyester (HDP), and polyvinylidene fluoride (PVDF). Different coatings have different features and applications. Below are more details for your reference.

Paints

Paints

Different Types of Paints

1. Polyester ( PE)

PE sheets are easy to process and have good adhesion. There are various colors to choose from. Besides, it’s the most cost-effective coating among other coating types. But its resistance to UV is poor. Therefore, the use of PE coating is limited. Its service life is 7-8 years.

Features

1. Attractive
2. Easy to process
3. Cost-effective
4. Poor corrosion-resistance

Applications

Considering its good adhesion, PE is often used as a primer coat. While its resistance to corrosion is poor, it doesn’t suit the severe corrosive environment.

PE Primer Coating

PE Primer Coating

2. Silicone Modified Polyester (SMP)

It has better heat resistance, durability than PE coating. Its service life is up to 12 years. But it is hard to process, and the adhesion of silicone to the material is not strong.

Features

1.Durable
2.Heat resistant

Applications

It is often applied to roofing and exterior walls.

Exterior Wall

Exterior Wall

Color Coated Roof

Color Coated Roof

3. High Durability Polyester (HDP)

It has better performance than PE and SMP, and its service life is up to 15 years. The ultraviolet absorber and hindered amines (HALS) in the coating formulation can improve the weather resistance of the paint film. High weather-resistant polyester coil coatings have been recognized by the market, and the cost-effectiveness of the coatings is very outstanding.

Features

1. Higher UV resistance
2. Cost-effective

Applications

HDP is widely used to power and metallurgical industry, etc.

4. Polyvinylidene fluoride (PVDF)

In addition to chemical resistance, its mechanical properties, UV resistance, and heat resistance are also outstanding. It has the strongest protection. Under normal circumstances, its anti-corrosion life can be as long as 20 to 25 years.

Features

1.Excellent heat resistance
2. Great mechanical properties
3. Good resistance

Applications

It is often applied to chemical plants, power plants, and high-speed rail stations due to its excellent corrosion resistance and resistance to UV.

Below is a table to compare the performance.

Coating Types Hardness Strength Corrosion Resistance Cost
PE Excellent Good Good Low
SMP Good Common Good Medium
HDP Good Excellent Excellent Medium
PVDF Common Excellent Good High

How to Select the Best Paint for Your Project?

1. Type of Paints

As mentioned, there are different types of paints on the market. You can choose a cost-effective one to suit your needs best.

2. Paints Brand

You can also find a lot of paints brand, such as Nippon, Akzo Nobel, etc. You can select the one you like according to your budget.

Famous Paint Brands

Famous Paint Brands

3. Thickness of Coating

Durability and heat resistance are influenced by the thickness of the coating. PVDF coating requires a thicker coating film, which makes steel products more durable. It has the best performance. If the environmental conditions are terrible, it is a suitable one for your project.

4. Coating Colors

Color is the first concern for buildings. Your choice is mainly based on the surrounding environment and your preference. Besides, the light color paint has a stronger heat reflection. While dark colors are easy to fade when exposed to ultraviolet rays.

Popular Colors

Popular Colors

Conclusion

Painting is an affordable and effective method to protect the base metal from rusting and corrosion. It also makes the steel more smooth and beautiful to meet the different requirements for different uses. Wanzhi Steel offers custom solutions, including paints, colors, designs, the thickness of coatings, etc. Welcome to contact us for details!

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