Selecting the right PPGI coil for cold storage sandwich panel manufacturing is critical for achieving thermal efficiency, corrosion resistance, and structural longevity in temperature-controlled environments. As a leading PPGI supplier China, ChinaCNU Steel delivers prepainted galvanized steel coil engineered specifically for insulated panel systems. Our color coated steel coil meets rigorous international standards, ensuring your cold storage project performs reliably for decades. With a Qingdao factory, 15+ years export experience, and ISO certification, we provide FOB pricing on MOQ 25 tons to buyers across 80+ countries.
Why PPGI Coil Is Essential for Cold Storage Sandwich Panels
Cold storage panels demand materials that resist condensation, thermal bridging, and corrosion from constant humidity and temperature fluctuations. Prepainted galvanized steel coil offers the ideal substrate because the hot-dip galvanized layer provides sacrificial protection, while the paint system adds a barrier against moisture and chemicals. The PPGI coil for cold storage sandwich panel must have a tightly controlled zinc coating weight—typically Z180 to Z275 per ASTM A653—to prevent edge rust in high-humidity freezers. Our galvanized steel coil undergoes continuous hot dip galvanizing before the paint application, ensuring uniform adhesion and flexibility for rollforming.
PPGI Coil For Cold Storage Sandwich Panel Price Trend (USD/Ton) – Last 12 Months
Data: ChinaCNU Steel Market Research | FOB Tianjin Reference Price
Key Properties for Insulated Panel Applications
The core requirements include high peel resistance, excellent formability, and compatibility with PU or PIR foam. RAL color PPGI options like RAL 9002 or RAL 9010 are popular for cleanroom aesthetics, while dark colors such as RAL 7016 may be used for external walls. Our prepainted galvanized steel coil features a modified polyester or PVDF topcoat with a total paint thickness of 20-25 microns on the exterior and 7-12 microns on the reverse side. The back coat is specifically formulated to be PU-friendly, ensuring strong foam adhesion without delamination. This color coated steel coil also passes ASTM B117 salt spray tests for 500+ hours, critical for coastal cold storage facilities.
Technical Specifications and Grades for Cold Storage Panels
Choosing the correct steel grade and coating system directly impacts panel lifespan and energy efficiency. Below is a comparison table of our standard PPGI coil for cold storage sandwich panel options, all available from our Qingdao factory with FOB pricing.
| Parameter | Standard Grade (CGCC) | Premium Grade (CGCH) |
|---|---|---|
| Base Steel | Full hard galvanized | Structural grade galvanized |
| Yield Strength (MPa) | 280–350 | 350–550 |
| Zinc Coating (g/m²) | Z180–Z200 | Z200–Z275 |
| Topcoat Type | Polyester (PE) | PVDF or SMP |
| Total Paint Thickness | 20 µm (front) / 7 µm (back) | 25 µm (front) / 12 µm (back) |
| Salt Spray Resistance | 500 hours | 1000+ hours |
| Foam Adhesion | PU-friendly back coat | PU/PIR optimized |
| Typical Application | Indoor cold rooms | Outdoor freezer walls, high-humidity |
Our prepainted galvanized steel coil is produced under ISO 9001 and ISO 14001 certification. The hot dip galvanized steel substrate ensures that even if the paint is scratched, the zinc layer continues to protect against rust. For projects requiring specific RAL color PPGI, we maintain a color-matching service with fast turnaround.
Manufacturing Excellence at ChinaCNU Steel
Located in Qingdao, our factory operates three continuous coating lines with annual capacity exceeding 200,000 tons. Every PPGI coil for cold storage sandwich panel passes through strict quality gates: incoming galvanized coil inspection, chemical pretreatment, reverse roll coating, stoving, and final testing for gloss, hardness, and adhesion. We export to over 50 countries, including demanding markets in Europe, Southeast Asia, and the Middle East. Our PPGI supplier China status is backed by 15+ years of specialization in color coated steel for insulation panels.
Quality Control and Certifications
Each coil is tested for T-bend flexibility (≤2T), impact resistance, and crosshatch adhesion. The galvanized steel coil base must meet ASTM A653 or JIS G3302 standards. We also offer third-party inspection services such as SGS or BV at the buyer’s request. The color coated steel coil is wrapped in water-resistant paper, steel sheet, and wooden pallets for export, ensuring it arrives ready for immediate rollforming.
FOB Pricing and Ordering Information
Our FOB Tianjin pricing is competitive because we control the entire supply chain—from hot dip galvanizing to final coil packaging. Minimum order quantity is 25 metric tons per size and color. For PPGI coil for cold storage sandwich panel, typical widths range from 600mm to 1250mm, with thickness from 0.3mm to 1.2mm. Standard coil inner diameter is 508mm or 610mm. We accept 30% deposit via T/T or L/C at sight, with balance against copy of shipping documents. Delivery time is 15–25 days after deposit confirmation, depending on volume and coating type.
Frequently Asked Questions
1. What is the difference between PPGI and PPGL for cold storage panels?
PPGI uses a hot dip galvanized substrate (zinc coating), while PPGL uses Galvalume (aluminum-zinc alloy). For cold storage, PPGI is preferred because the zinc coating provides better cathodic protection at cut edges, which prevents rust in high-moisture environments. PPGL may be used in lower-humidity applications but is less forgiving on exposed edges.
2. Can you supply PPGI coil with anti-fingerprint coating for cleanrooms?
Yes. We offer an optional clear anti-fingerprint topcoat on our prepainted galvanized steel coil. This is ideal for cold storage panels used in pharmaceutical or food processing cleanrooms where surface hygiene and appearance are critical. The coating is applied after the main color coat and does not affect foam adhesion.
3. What is the maximum width you can produce for sandwich panel coils?
Our production lines can slit coils up to 1500mm wide, but for standard cold storage panel profiles, we recommend 1000mm or 1200mm widths. The final width depends on your rollforming machine’s capability. We can customize slitting to exact dimensions with a tolerance of ±0.5mm.
4. How do you ensure the back coat is PU-friendly?
The back coat formulation uses a polyester-epoxy resin with specific surface energy and roughness to maximize mechanical interlocking with polyurethane foam. We test each batch by applying PU foam under controlled conditions and measuring peel strength. Our standard achieves >4 N/mm adhesion, exceeding industry benchmarks.
5. What is the MOQ and typical lead time for RAL color PPGI?
Our MOQ is 25 tons per color and thickness. For standard RAL colors (e.g., 9002, 9010, 7016), lead time is 15–20 working days. Non-standard RAL colors may require an additional 5–7 days for color matching and approval. We maintain stock of popular RAL colors for faster shipment.
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