The surface steel of Sandwich panel, what are the choices?
2025-01-03
The PIR ( polyisocyanurate ) and PUR ( polyurethane) sandwich panel is known for their performance on insulation and fire resistance, hence are widely choose for projects like cold storage. The foam core plays an important role in insulation and fire resistance function. But do you know that the choice of surface material is also important and can add additional function to the sandwich panels.
One of the most popular surface material is PPGI: PPGI, or Preprinted Galvanized Iron, is a versatile metal material widely used in construction and manufacturing. It features a galvanized steel base that is coated with a layer of paint for excellent corrosion resistance and durability. Key features include its lightweight nature and its availability in a variety of colors and finishes for aesthetic customization. PPGI is also very environmentally friendly as its production process produces less waste. PPGI has a long service life and minimal maintenance requirements, making it ideal for roofing, wall cladding and other applications.
Usually, PPGI steel surface can add corrosion resistance, strength and waterproof features to the PIR sandwich panel and PUR sandwich panel in cold storage use. And with multiple and customizable color, they also have an appealing appearance.
Another popular surface steel material is stainless steel, the stainless steel perform better on strength, and the SUS304 stainless steel is better on corrosion resistance. Also, the stainless steel has an unique shining appearance make the sandwich panel looks high end.
Besides, other surface material like customized alloy, aluminum are also choose for special use, like food safe or super high corrosion resistance.


Besides the steel material itself, the coating also can help with special features.
Typical coating includes:
1. PVDF (Polyvinylidene Fluoride): Known for its exceptional resistance to UV radiation, chemicals, and weathering, PVDF provides a glossy finish that retains color vibrancy over time. This makes it ideal for outdoor applications, particularly in architectural projects.
2. HDP (High-Durability Polyester): HDP coatings offer superior durability and scratch resistance, making them suitable for high-traffic areas and industrial environments. They protect against corrosion and environmental factors, extending the lifespan of the material.
1.EP (Epoxy Polyester): This coating combines the benefits of epoxy and polyester, providing excellent adhesion and resistance to chemicals and moisture. EP coatings are ideal for indoor applications and environments where chemical exposure is a concern.

Inconclusion, different requirement can be satisfied by different sandwich panel surface material for both PIR and PUR sandwich panel. Please contact us with and special needs of questions, we will help you find the best solution for your cold storage refrigeration.