PPGI Coil Price Reference
The prepaint galvanized steel coil prices keep changing, which is calculated based on raw material(Hot rolled sheet), width, thickness, paint, and zinc. Here is the only reference price, Please email us to get the precise price.
Type of Coating
The coating types currently used for PPGI/PPGL steel coil include PE, PVDF, SMP, acrylic, PVC, etc.
The PE-coated color-coated steel sheet is easy to be processed and formed because of its good adhesion, and the price is relatively cheap. But the other degree of UV resistance and chalking resistance is relatively low. PE color coated steel can be used for the roof of ordinary civil buildings.
SMP steel plate has better durability, and the cost is higher than the PE coating. Silicone is not as good as PE in terms of adhesion and processing formability to materials,
High durable Polyester (HDP)
It is better than ordinary SMP coatings, and its outdoor weather resistance reaches 16 years. Its flexibility and weather resistance are higher.
PVC coating has nice anti-chemical and anti-water, and the coasting is relatively thick, which can well protect the substrate.
The PVC coating is rarely used because they pollute the environment.
PVDF coatings have great color retention and corrosion resistance. Among the PPGI sheet coating for construction, it is the highest grade.
The comprehensive performance is good, the price is expensive, and it is only used in specific fields (such as containers).
|Coating primer||Top paint coating||Service life(years)|
|1) Epoxy primer, good adhesion, water resistance, alkali resistance, chemical corrosion resistance, poor single toughness.|
2) Polyester primer, good adhesion, good flexibility, sensitive to humid environment, chemical resistance is not as good as epoxy primer.
3) Acrylic primer, good adhesion, good toughness and high pretreatment requirements.
4) polyurethane primer, chemical resistance, abrasion resistance, durability, toughness
|1) Polyester resin, good adhesion, molding and outdoor durability.||8-10|
|2) Silicon Modified Polyester (SMP)||10-15|
|3) High weather resistant polyester (HDP)||12-15|
|4) Polyvinyl fluoride (PVC)||12-15|
|5) Polyvinylidene fluoride/fluorocarbon (PVDF) It has good formability and color retention, good outdoor durability and powder resistance, solvent resistance, limited color and high price.||12-20
Coating Performance Comparison Table
|Category||Hardness||Bend||Corrosion resistance||Weather resistance||Cost||Coating thickness requirements
|Silicon modified polyester||good||general||good||excellent||good||20|
You need to consider when choosing a primer
1) Adhesion of primer and finish coating
2) Corrosion resistance of primer
For the back coating, if the color-coated steel sheet is a Single layer, Color coated steel with a back primer plus a back finish coating was selected.
The primer is of the same variety as the front, and a layer of light color (such as white) polyester is selected for the finish coating.
If the PPGI steel coil is used as a sandwich panel, a layer of epoxy resin with excellent adhesion and corrosion resistance is sufficient.
Type of steel
For buildings, the bearing weight (wind load, snow load) and the span of the building all depend on the strength of the steel plate. Divided into CQ, DQ, HSS, FH according to steel types.
Generally, the PPGI coils for construction are rolled forming or sandwiched. Please use CQ steel.
The substrate of the prepainted steel coil has a cold-rolled substrate, hot-dipping galvanized substrate and, aluzinc substrate.
Cold-rolled steel substrate
prepainted steel sheets produced from cold-rolled substrates have the processing properties of cold-rolled sheets.
If the coating is scratched, the cold-rolled substrate will be directly exposed and will quickly rust. It can only be used for temporary barriers that are not demanding. It has the lowest price and is not recommended for civil buildings.
Hot-dipping galvanized steel substrate
In addition to the protective effect of zinc, the prepainted galvanized steel sheet also has coating protection, and the service life is longer than that of the hot-dipping galvanized steel sheet.
Hot-dipping galvalume steel substrate
Hot-dipping galvalume steel (55% AI-Zn) is used as the prepainted galvalume steel coil substrate.
The corrosion resistance of hot-dipping galvalume steel sheets is 2 to 5 times that of hot-dipping galvanized steel sheets.
The above three are the most common pre-painted steel coil substrates, To ensure longer service life. For building roofing applications, it is recommended to choose galvanized substrates and galvalume substrates.