PPGI Sandwich Panel Manufacturer

PPGI Sandwich Panel

PPGI Sandwich Panels use pre-painted galvanized iron (PPGI) steel as both face layers, bonded to an insulation core that can be PIR, EPS, or rockwool depending on the thermal and fire-performance requirements of the project. The PPGI designation refers specifically to the coated steel facing, not the core material. A typical zinc coating of Z275 (275 g/m²) protects the underlying steel from corrosion, while the factory-applied paint system provides long-term color retention and weather resistance.

The combination of a rigid foam or mineral core with painted steel skins gives the panel both structural spanning capacity and thermal insulation in a single factory-assembled unit. This eliminates the need for separate insulation layers, vapor barriers, and exterior cladding during construction.

Available profiles include corrugated and trapezoidal designs for roofing, plus flat or micro-ribbed faces for walls. Standing-seam systems allow concealed fastening for a cleaner appearance, while exposed-fastener designs offer a more economical option. Exterior finishes are available in a wide range of RAL and custom colors, with interior faces typically supplied in standard off-white or custom colors.

Installation involves securing panels to wooden or steel purlins using self-drilling screws with EPDM sealing washers, positioned at corrugation high points to prevent water accumulation. The interlocking joint system enables rapid modular assembly, reducing on-site labor time while ensuring waterproofing and structural integrity for industrial, commercial, and agricultural applications.

PPGI Sandwich Panel Engineering Guide

Pro Tip: Zinc Coating Grade Determines Exterior Lifespan
PPGI steel is specified by its zinc coating weight. Z275 (275 g/m²) is the baseline for exterior wall and roof panels, providing 15-20 years of corrosion protection in normal environments. For coastal or industrial zones with salt spray or chemical exposure, Z350 or AZ150 (Aluzinc) coatings extend service life to 25-30 years.

1. PPGI Steel Specifications: Coating Weight and Paint System

The term PPGI refers to galvanized steel that has been cleaned, primed, and painted in a continuous coil coating line before forming. The performance of a PPGI sandwich panel depends on two variables: the metallic zinc coating beneath the paint, and the organic paint layer on top.

Paint System	Color Stability	Best For
Polyester (PE)	12 – 15 years	Standard industrial and commercial buildings in moderate climates
SMP	15 – 20 years	High-UV environments, tropical and subtropical regions
PVDF	25+ years	Coastal, industrial, and architectural projects requiring long-term color retention

2. Core Material Selection: PIR vs EPS vs Rockwool

Core	Thermal Conductivity	Best For
PIR (standard)	0.022 W/m-K	Wall and roof panels for most industrial and commercial buildings
EPS	0.034 – 0.038 W/m-K	Budget-sensitive projects, agricultural buildings, site offices
Rockwool	0.040 W/m-K	Buildings requiring A1 non-combustible fire classification

3. Panel Thickness and Thermal Performance

Using PIR core as the baseline (lambda 0.022 W/m-K), panel thickness directly determines the thermal resistance:

Thickness	R-Value (PIR)	Typical Use
50 mm	~R-13	Partition walls, interior panels
75 – 100 mm	~R-19 to R-26	Exterior walls in temperate climates
150 mm	~R-39	Roof panels, cold storage walls
200 mm	~R-52	Freezer rooms, extreme climate roofing

4. Joint Systems and Installation

PPGI sandwich panels use two primary joint systems. Exposed-fastener panels use self-drilling screws with EPDM washers through the panel face into steel or timber purlins — economical and suitable for most industrial buildings. Concealed-fastener panels use stainless steel clips that grip the panel rib without visible screws on the surface, providing a cleaner architectural appearance and eliminating potential leak points. Side laps align tongue-and-groove edges with a factory-applied butyl tape sealant for airtight, watertight joints.

5. Where Are PPGI Sandwich Panels Most Commonly Used?

Industrial and Commercial Walls

Factory buildings, warehouses, and distribution centers requiring insulated exterior envelopes with rapid installation.

Roofing Systems

Pitched and low-slope insulated roofing for industrial facilities, using corrugated or trapezoidal profiles.

Cold Storage and Partitions

Temperature-controlled storage facilities and interior partition walls separating temperature zones.

Agricultural Buildings

Livestock barns, crop storage, and equipment sheds where cost-effective insulation and durability are required.

Optimize Your Build with PPGI Sandwich Panel Supplier Solutions

RaxPanel is a trusted manufacturer based in China, serving clients worldwide. Our reputation is founded on dedicated quality craftsmanship and a knowledgeable team. As a leading direct manufacturer of custom composite panel solutions, our PPGI Sandwich Panels are engineered to deliver effective insulation and protection for a wide range of applications.

These panels feature a precision-engineered foam core encapsulated between high-quality PPGI steel sheets, offering an integrated solution for thermal efficiency and durability. With our production capabilities, we ensure consistent quality and timely delivery. Our panels are available in various thicknesses, profiles, and finishes to meet diverse architectural and functional needs, from commercial walls to industrial roofing and cold storage facilities.

Committed to sustainability, we believe in providing eco-friendly building solutions that reduce energy consumption. As a manufacturing and supply specialist, we focus on delivering premium products without installation services, empowering partners worldwide.

Browse our selection of building envelope components and contact RaxPanel today to choose the ideal products for your project’s functional, sustainable, and aesthetic requirements.

Parameter	Specification
General Specifications
Product Type	Insulated Metal Panel (IMP)
Core Insulation Material	PIR (standard), EPS, or Rockwool (optional)
Typical Applications	Roofs, Walls, Cold Storage, Industrial, Commercial, Residential, Agricultural, Healthcare
Thermal Performance
Available Thickness	50mm, 75mm, 100mm, 120mm, 150mm, 200mm
R-Value (PIR Core)	~0.022 W/m·K (approx. R-7.2 per inch)
Maximum R-Value (with advanced cores)	Varies by thickness (e.g., ~R-13 at 50mm to ~R-52 at 200mm with PIR core)
Dimensions
Panel Width Range	1000mm or 1200mm
Panel Length	Up to 11.8m (fits 40ft HC container)
Materials & Finishes
Exterior Face	Pre-painted steel sheet
Interior Face	Pre-painted steel sheet
Standard Interior Color	Off-White (similar to RAL 9002)
Exterior Coating Options	Polyester, Heavy-Duty 200µm Plastisol Coated Steel, etc.
Color Availability	Extensive, virtually any color
Core Foam Density	~40 kg/m³
Structural & Installation
Minimum Roof Pitch (Pitched)	4 degrees
Minimum Roof Pitch (Flat/Drainage)	2 degrees
Fastening System	Exposed or concealed clip systems
Substructure Compatibility	Wooden or steel trusses
Load Capacity	Suitable for accessory mounting (e.g., solar panels) with proper specification
Fire & Acoustic Performance
Flame Spread Rating (Example)	10 (tested per CAN/ULC S102-10)
Smoke Developed Classification (Example)	215 (tested per CAN/ULC S102-10)
STC Rating (Example)	26 (tested per ASTM E90)

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Corrugated Insulated Panel

EPS Sandwich Panel

Exterior Wall Cladding Panel

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PPGI Sandwich Panel

PIR Sandwich Panel

Plywood Foam Core Panel

Rockwool Sandwich Panel

Snap N Lock Insulated Panel

Z Lock Insulated Panel

Frequently Asked Questions

What is a PPGI Sandwich Panel?

PPGI Sandwich Panels are insulated metal panels consisting of two pre-painted galvanized steel sheets with a rigid insulation foam core, such as PIR or polyisocyanurate, providing a complete solution for building envelopes that integrates insulation, protection, and finish in one product.

What are the typical applications for PPGI Sandwich Panels?

PPGI Sandwich Panels are versatile and used for walls, roofing, cold storage, demising walls, and partitions in commercial, industrial, agricultural, and residential buildings, offering effective thermal insulation and structural support.

What types of insulation are used in PPGI Sandwich Panels?

PPGI sandwich panels are available with PIR (standard, R-7.2 per inch), EPS (economical), or Rockwool (A1 fire-rated) cores. PIR is the most common choice for its balance of thermal performance, cost, and fire classification.

What standard sizes and thicknesses are available?

Panels are typically available in widths of 1000mm or 1200mm, with lengths up to 11.8m, and thicknesses ranging from 50mm to 200mm, allowing customization for various project requirements.

Can PPGI Sandwich Panels be installed by DIYers, or is professional installation recommended?

While experienced DIYers may attempt installation, professional installation is often recommended due to the complexity and safety risks involved; proper fastening, alignment, and adherence to building codes ensure optimal performance and durability.

What are the key benefits of using PPGI Sandwich Panels?

Benefits include energy efficiency through high R-values, fast installation reducing construction time, durability with steel skins, aesthetic flexibility with various colors and profiles, and cost-effectiveness over the building lifecycle.

How do PPGI Sandwich Panels contribute to energy efficiency?

With insulation cores like PIR offering R-values around R-7.2 per inch, these panels minimize heat transfer, reducing heating and cooling costs and contributing to lower energy consumption and carbon emissions in buildings.