0.40mm DX51D Z120 PE Prepainted Steel Coil RAL9002 for Roofing and Wall Cladding

Product Specification

0.40mm DX51D Z120 PE Prepainted Steel Coil RAL9002 for Roofing and Wall Cladding Applications

１．Product Overview

0.40mm DX51D Z120 PE Prepainted Steel Coil is a color-coated galvanized steel product designed for roofing sheets, wall cladding panels, steel structure buildings, industrial facilities, and general architectural applications.

The product uses DX51D galvanized steel as the substrate with a Z120 zinc coating. A polyester paint system is applied to the galvanized surface through a continuous coil-coating process, combining metallic corrosion protection with a decorative pre-painted finish.

The 0.40mm thickness is suitable for lightweight profiling and roll-forming applications. RAL9002 provides a neutral grey-white surface commonly selected for industrial and commercial building panels.

２．Technical Solution

The galvanized steel substrate provides the primary corrosion protection. The Z120 zinc coating forms a metallic protective layer over the steel surface and helps reduce direct exposure of the substrate to moisture and atmospheric conditions.

Before painting, the galvanized surface is cleaned and chemically pretreated. A primer layer is applied to improve adhesion between the metallic coating and the top paint layer.

The PE top coating provides the required color, surface appearance, and protection for general building applications. A protective back coating can also be applied to improve reverse-side protection during coil handling, profiling, transportation, and installation.

The prepainted coil can be continuously processed into roofing panels, wall cladding sheets, ceiling panels, and other formed building components without requiring additional painting after profiling.

３．Specifications

４．Application

• Roofing sheet production
• Wall cladding panels
• Steel structure workshops
• Warehouse buildings
• Industrial building panels
• Commercial buildings
• Agricultural buildings
• Ceiling panels
• Garage doors
• Equipment housings
• Decorative metal panels
• General building components

５．Processing

• Roll forming
• Corrugating
• Slitting
• Cut-to-length processing
• Bending
• Profiling
• Punching
• Stamping
• Panel fabrication
• Edge folding
• Protective film application
• Customized sheet processing

６．Advantages

• The 0.40mm thickness supports lightweight roofing and wall panel production.
• DX51D substrate provides suitable formability for common roll-forming and profiling operations.
• Z120 zinc coating provides metallic corrosion protection for general building applications.
• The PE coating provides a consistent decorative surface and protection under normal atmospheric conditions.
• RAL9002 provides a neutral color suitable for industrial, warehouse, and commercial building projects.
• The factory-applied paint system reduces additional painting work after panel production.
• Continuous coil supply supports automated roofing and wall panel production lines.
• The material can be slit and profiled according to different finished panel dimensions.

７．How to Choose

• Choose the steel thickness according to required panel rigidity, profile design, purlin spacing, forming requirements, and finished product weight.
• Select the substrate grade according to the forming depth and mechanical requirements of the finished panel.
• Choose the zinc coating according to humidity, rainfall, industrial exposure, and expected service environment.
• PE coating is suitable for general roofing, wall cladding, and industrial building applications.
• For projects requiring improved outdoor durability, UV resistance, or color retention, HDP, SMP, or PVDF paint systems can be considered.
• Confirm the RAL color before production, especially when material from different production batches will be installed on the same building.
• Check coil width, coil inner diameter, and coil weight against the decoiling, slitting, and roll-forming equipment before ordering.

８．FAQ

Q1．What is the substrate of this prepainted steel coil?

The representative product uses DX51D hot-dip galvanized steel as the substrate.

Q2．What does Z120 mean?

Z120 indicates a nominal total zinc coating weight of 120g/m² on both sides of the galvanized steel substrate.

Q3．What paint system is used?

The representative specification uses a PE, or polyester, coating system with primer and top paint applied to the galvanized substrate.

Q4．Can this coil be used for roofing sheet production?

Yes. It is suitable for continuous roll forming into corrugated roofing sheets, trapezoidal roofing panels, and related building profiles.

Q5．Can it be used for wall cladding?

Yes. The material can be profiled into exterior wall cladding, workshop panels, warehouse panels, and other building envelope components.

Q6．Can other colors be supplied?

Yes. The surface color can be selected according to the required RAL color or an approved customer color sample.

Q7．What is the difference between PE and PVDF prepainted steel?

PE is commonly used for general construction applications. PVDF is generally selected for projects requiring higher weather resistance, UV resistance, and longer-term color retention.

Q8．Can the thickness and width be customized?

Yes. Thickness, width, coating specification, paint system, color, and coil dimensions can be selected according to production capability and project requirements.