High-Quality Prepainted Galvanized Steel Coil (PPGI) Manufacturing Standards
PPGI Steel Coil: High-Quality Coated Steel for Durability & Aesthetics
Key Coating Options for Versatile Needs
PPGI Steel Coil Specifications
| Item | Specification |
| Base Metal | Hot-dip galvanized steel |
| Thickness | 0.12 – 1.50 mm |
| Width | 600 – 1250 mm |
| Zinc Coating | Z40 – Z275 g/m² |
| Paint Type | PE / SMP / HDP / PVDF |
| Top Coating | 10 – 30 microns |
| Back Coating | 5 – 15 microns |
| Coil Weight | 3 – 8 MT |
| Color | RAL colors / wooden /customized |
| Surface Finish: | Glossy, matte, or textured |
Special Pattern
Brick Pattern PPGI
Woodgrain PPGI
Flower Design PPGI
Wrinkle/Textured Matt /PPGI
Application and Recommend Specification
Cold Room Panel
Steel thickness: 0.4mm(min) Paint: Standard polyester Zinc weight: 120gms(min)
Topcoat: 20 microns Primer: 5 microns Protective Film: available
Steel thickness: 0.5mm(min) Paint: Standard polyester or SMP Zinc weight: 275gms(min)
Topcoat: 20 microns Primer: 5 microns Protective Film: available
Wide-Ranging Application Scenarios
Sectional
Base Metal (Galvanized Steel): The core of the coil is galvanized steel, which is steel coated with a layer of zinc to provide corrosion resistance.
Chemical Treatment Layer: This layer is applied to the galvanized steel to improve adhesion of the subsequent coatings and to enhance corrosion resistance.
Primer Coating: A primer coating is applied on top of the chemical treatment layer. This layer further enhances adhesion and provides an additional barrier against corrosion.
Topcoat (Finish Coat): The topcoat is a colored paint layer that provides both aesthetic appeal and additional protection.
Back Coat (Optional): On the underside of the coil, a back coat may be applied.
Why Choose Our Prepainted Galvanized Steel Coil(PPGI)?
Dual Protection : Our prepainted galvanized steel coil is designed to withstand the conditions. The galvanization process ensures exceptional resistance to corrosion, while high-quality paint coating provides an extra layer of protection against the elements.
Wide Range of Uses: Whether you are in the construction or cold storage industry, our steel coils are the perfect solution for a wide range of applications.
Aesthetic Appeal: Available in a variety of colors and finishes, our prepainted galvanized steel coil allows you to achieve the perfect look for your project. The vibrant, long-lasting colors ensure that your products not only perform well but also look stunning.
Free Sample Testing：Free PPGI sample testing (coating thickness, corrosion resistance, color consistency) is provided. Pay small shipping; verify quality risk-free before bulk orders.
Possible Coating Options
Our pre-painted galvanized steel coil (PPGI) has various types of paints. We can recommend the paint according to your application environment.
| Coating Type | Core Features | Outdoor Service Life | Applicable Scenario | Cost-Effectiveness |
| PE (Polyester) | Rich colors, strong adhesion, regular weather/scratch resistance | 5-8 years | Indoor decoration, general non-coastal outdoor construction, home appliance shells | High |
| SMP (Silicone Modified Polyester) | Better weather/heat/scratch resistance than PE, good color retention | 10-15 years | Industrial plants, warehouse roofs, outdoor construction with medium-high requirements | Medium |
| PVDF (Fluorocarbon) | Superior corrosion/UV/color resistance, suitable for coastal/high-pollution areas | 20-25 years | Coastal/strong sunlight/high-pollution area construction, high-end curtain walls | High (high-end) |
Popular Colors of PPGI Steel
We can customize the color according to your sample, the following colors are just examples .According to our experience, RAL5017 (sky blue), RAL5003 (moss green), RAL9003 (signal white), RAL 3020 (traffic red), isp popular in South America , for example Colombia , Peru，Ecuador and some other Latin American etc. Ral 9002 and RAL 7016 ,RAL 3005 is popular in Qatar , Turkey ,Azerbaijan ,Saudi Arabia，Iraq etc. But Ral 8017,RAL 8019 ,RAL 9005,RAL 3005 Ral 7024 ,Ral 7035 ,RAL 5015 is very popular in Europe and CIS countries.You can also choose other colors according to the RAL color card. Moreover, Shuangxin Steel is able to customize various patterns, such as wood grain metal, grass, flowers, brick, camouflage patterns, feather-like patterns, etc. Welcome to contact us for more details!
RAL 2004
RAL 3003
RAL 3005
RAL 3009
RAL 3011
RAL 3020
RAL 5004
RAL 5005
RAL 5015
RAL 5017
RAL 6005
RAL 6020
RAL 7016
RAL 7021
RAL 7024
RAL 7035
RAL 8004
RAL 8017
RAL 8019
RAL 9002
RAL 9003
RAL 9006
RAL 9005
RAL 9010
Manufacturing Experience & Quality Control
Our PPGI steel coils are produced on advanced continuous color coating lines with strict quality control at every stage.From steel substrate selection and surface pretreatment to painting, curing, and final inspection, each process is monitored to ensure coating thickness, adhesion, gloss, and color consistency.Our products comply with international standards such as ASTM A755, EN 10169, and JIS G3312, ensuring reliable performance for global markets.
Need help choosing zinc coating or paint system?
Talk to our technical team →
Salt Spary Test
Coating Test
Pencil Hardness
T-bending test
MEK test
Package & Delivery
• Standard seaworthy export packing
• Inner waterproof paper + outer steel sheet
• Steel strips for strong protection during transportation
• Suitable for container and bulk shipment
Frequently Asked Questions
Here are the common questions that you may want to know.
Does Pre-painted Galvanized Coil Have a Protective Film?
The protective film is a transparent or colored plastic film coated on the surface of the pre-painted galvanized steel coil. The purpose is to prevent scratches on the painted surface paint during cold roll forming.
Our plastic film thickness is 30 microns, 40 microns, 50 microns, 60 microns, and 80 microns.
What is Prepainted Galvanized Steel Coil(PPGI Coil) HS Code
The HS Code for prepainted galvanized steel coil(PPGI Coil) with a thickness of <1.5mm and a width of 600mm and above is 721070.
Note: If importing from China, please check the import tariff of your local country.
What is Price of Pre-painted Galvanized Steel Coils
The price of ppgi coils varies depending on the raw material of steel, the weight of zinc of the galvanized substrate used, the type of coatings used, the thickness of the top coat and back coat, the width and thickness of the steel coil to influence the price.
What is the standard paint coating thickness for PPGI steel coil?
The top finish coating is larger than 20μm to prevent the intrusion of corrosive media. Due to the different anti-corrosion mechanisms of primer and finish coating, not only the total coating thickness should be guaranteed, but also the thickness of primer (>5μm) and finish coating (>15μm).
PVDF pre-painted steel coil requires a thicker coating. It provides a longer service life. The requirements for the backside paint coating depend on the application, and the sandwich panel only requires a layer of primer. The formed steel plate requires two coats. The thickness is at least greater than 10 μm.
How many years can you guarantee for the PPGI ?
For normal PPGI we can guarantee 3-5 years , Matt ppgi we can guarantee 7-10 years