Color Coated Coils

Product Introductions

Color-coated steel coil is a kind of coil treated with organic coating on the surface of cold-rolled steel plate or galvanized steel plate, which has the characteristics of good corrosion resistance, bright color and beautiful appearance. This material is widely used in construction, home appliances, transportation and other industries, especially in the construction industry, mainly used in steel structure plants, airports, warehouses, refrigeration and other industrial and commercial buildings of the roof, walls and doors. The production process of color coated steel coil includes surface pretreatment (degreasing, cleaning, chemical conversion treatment), continuous coating (roll coating), baking and cooling steps. In the production process, the following points should be paid attention to to ensure product quality: mold shape and gap setting: The appropriate gap should be set according to the mold shape, deformation characteristics, process conditions and other factors during processing, and the thickness of the coating should be considered when setting the gap. Coating lubricity: Most coatings can be used as solid lubricants and can meet the lubrication requirements of most forming processes. If the lubricity of the coating is insufficient, the lubricity can be improved by applying oil, waxing, and covering a strippable protective film. Coil collapse prevention measures: In the production process of color coated steel plate, the problem of coil collapse occasionally occurs, which will bring great trouble to the production. The static friction coefficient between different kinds of color plates was measured by experiments, and the causes of different kinds of coating collapsing were analyzed from the microscopic point of view.

Product Paramenters

Applications

The main use of color coated steel coil

Construction industry: Used for roofing, walls and doors of industrial and commercial buildings such as steel structure workshops, airports, warehouses and refrigeration.

Home appliance industry: used to manufacture housings for various household appliances.

Transportation industry: For the manufacture of external structural components for vehicles.

With the progress of science and technology and the enhancement of environmental awareness, the color steel plate activity room is more and more showing strong vitality and broad market prospects, and is favored by construction, home appliances, electrical and mechanical, transportation, interior decoration, office appliances and other industries.

Product Packaging

Color coated coils are pre-painted metal substrates, usually made of galvanized steel or aluminum, that are coated with high-performance paints or organic layers to enhance corrosion resistance, aesthetics, and functionality. These coils are widely used in construction, appliances, automotive, and packaging due to their durability, uniformity, and ease of fabrication.

This article provides a comprehensive overview of color coated coils, detailing their materials, coating systems, manufacturing processes, industry standards, and key application considerations. It is designed for engineers, procurement professionals, and decision-makers seeking precise information for industrial or commercial implementation.

1. What Are Color Coated Coils?

Color coated coils are metal sheets that have undergone continuous coil coating—a process that applies protective and decorative organic coatings on the surface of the metal substrate. Common substrates include:

• Hot-Dip Galvanized Steel (GI)

• Galvalume Steel (GL)

• Cold-Rolled Steel (CR)

• Aluminum

Coating layers typically consist of a primer, a top coat (such as polyester, PVDF, or SMP), and optionally a backing coat on the reverse side.

2. Technical Composition and Material Layers

A typical color coated coil structure includes:

1. Base Metal Substrate (e.g., galvanized steel)

2. Chemical Pretreatment for adhesion and corrosion resistance

3. Primer Coating (~5–7μm)

4. Top Coat Layer (~15–20μm)

5. Backing Coat (~5–10μm, optional)

Coating Types:

• Polyester (PE): Economical and good UV resistance.

• Silicone Modified Polyester (SMP): Enhanced weatherability.

• Polyvinylidene Fluoride (PVDF): Premium-grade, superior corrosion resistance.

• Epoxy or PU: For specialty or industrial uses.

3. Engineering Standards and Certifications

Color coated coils must comply with multiple international standards, ensuring quality and performance across environments. Key standards include:

• ASTM A755 (USA): Prepainted metallic-coated steel sheet.

• EN 10169 (EU): Continuously organic coated (coil coated) steel flat products.

• JIS G 3312 (Japan): Prepainted hot-dip galvanized steel sheet.

• ISO 12944: Classification for corrosion protection by coating systems.

Coating thickness, adhesion, hardness, gloss, pencil hardness, and salt spray resistance are among the tested properties.

4. Typical Applications

Color coated coils are versatile across a range of applications:

Building & Construction

• Roofing sheets

• Wall panels

• Ceiling tiles

• Garage doors

Home Appliances

• Refrigerator panels

• Washing machine bodies

• Microwave oven enclosures

Automotive & Transportation

• Bus panels

• Trailer bodies

• Interior trim panels

Industrial Packaging

• Drum and pail lids

• Electrical cabinets

5. Technical Performance Metrics

6. Compliance and Regulatory Considerations

Color coated coils used in architectural projects must meet fire, environmental, and safety regulations:

• REACH & RoHS: Restriction of hazardous substances in coatings.

• LEED Credits: Low-VOC coatings contribute to green building points.

• Fire Rating: Some PVDF-coated coils meet Class A fire resistance.

7. Operation and Handling Guidelines

To ensure performance and longevity, several operational practices are recommended:

• Storage: Dry, well-ventilated areas, ideally indoors.

• Handling: Use non-abrasive tools and gloves to prevent scratching.

• Fabrication: Suitable for roll-forming, bending, punching; avoid excessive reverse bending which may crack the coating.

• Cleaning: Mild detergent and soft sponge; avoid acidic or abrasive cleaners.

8. FAQs on Color Coated Coils

Q1: What is the typical lifespan of color coated coils in outdoor environments?
A: With PVDF coatings, lifespan can exceed 20–25 years under moderate exposure. SMP and PE coatings may offer 10–15 years, depending on environmental conditions.

Q2: How do I choose the right coating type?
A: For cost-sensitive indoor applications, PE is sufficient. For UV-exposed or coastal environments, PVDF or SMP are recommended.

Q3: Can these coils be recycled?
A: Yes. Most base metals and organic coatings comply with recyclable material standards.

Q4: Are color coated coils available in custom colors?
A: Yes. Most suppliers offer RAL or Pantone color customization with MOQ considerations.

9. Call to Action: Select the Right Coil for Long-Term Performance

Color coated coils offer a durable and aesthetic solution across multiple industries, balancing structural integrity with visual appeal. Choosing the appropriate coating system, substrate, and thickness based on environmental exposure and application requirements is key to maximizing lifespan and ROI.

We recommend consulting with qualified engineers and referencing applicable standards before procurement and installation. Contact us today to get expert advice on material selection, compliance, and logistics support.