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Color Coated Coils

Standard:ASTM/JIS/GBT/EN etc
Steel Grade:SGCC, DX51D, S250GD, S550GD etc
Thickness:0.12mm ~ 2.0mm
Width:600mm ~ 1500mm
Top paint/back paint:5+15μm/7-9μm or 5+20μm/10-12μm or as per client’s needs
Zinc coating:Z30 ~ Z275
Color:Any color as per client’s needs
Coil ID:508mm/610mm
Coil weight:as per client’s needs
Packing:vertical or horizontal package

Prepainted Galvanized Steel Coil (PPGI)

PPGI Sheet Coating Layer

Prepainted steel sheet is coated with organic layer, which provides higher anti-corrosion property and a longer lifespan than that of galvanized steel sheets.

Base metal:

The base metals for prepainted steel sheet consist of cold rolled, hot-dip galvanized, electro-galvanized and hot-dip zinc-alu-mag base metal. The finish coats of prepainted steel sheets can be classified into groups as follows: polyester, silicon modified, polyesters, polyvinylidene fluoride, high-durability polyester etc.

Prepainted Aluzinc Steel Coil, Prepainted Galvalume Steel Coil (PPGL)

PPGL Coil Profile

Prepainted steel sheet is coated with organic layer, which provides higher anti-corrosion property and a longer lifespan than that of aluzinc steel sheets.

The base metals for prepainted steel sheet consist of cold rolled, hot-dip galvanized, electro-galvanized and hot-dip zinc-alu-mag base metal. The finish coats of prepainted steel sheets can be classified into groups as follows: polyester, silicon modified, polyesters, polyvinylidene fluoride, high-durability polyester etc.

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.

Noted:Generally, the PPGI coils for construction are rolled forming or sandwiched. Please use CQ steel.

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.


COLOUR COATED PLAIN SHEETS SPECIFICATIONS

Thickness range(mm)

Width (mm)

Length (mm)

Pkt. Weight (MT)

Standards

0.18 – 1.25

1250 Max.

4,000 Max.

3 Max.


1. Classifications & Sympol

Classifications

Items

Symbol

Paint type

Polyester

PE

Silicon modified polyester

SMP

High-durability polyester

HDP

Polyvinylidene fluoride

PVDF

Paint surface texture

Regular prepainted

TC

Embossed sheet

YA

Printed sheet

YI

Paint structure

One-coating-and one-baking

2/1

Double-coating-and-double-baking

2/2

2. Paint property:

Top paint

Paint thickness/ μm

Pencil hardness

180° bend

Impact(J)

Salt pray resistance

PE

≥20

≥F

≤4T

≥9

≥1000hours

SMP

≥20

≥F

≤4T

≥9

≥1000hours

HDP

≥20

≥HB

≤4T

≥9

≥1500hours

PVDF

≥20

≥HB

≤4T

≥9

≥2000hours


3.Steel Grade and Application:

Base metal of Prepainted steel

Application

Hot-dip Zinc

Hot-dip Zinc-Fe alloy

Hot-dip Al-Zinc alloy

Hot-dip Z-Al alloy

Eletro-galvanized

TDC51D+Z

TDC51D+ZF

TDC51D+AZ

TDC51D+ZA

TDC01+ZE

CQ

TDC52D+Z

TDC52D+ZF

TDC52D+AZ

TDC52D+ZA

TDC03+ZE

DQ

TDC53D+Z

TDC53D+ZF

TDC53D+AZ

TDC53D+ZA

TDC04+ZE

DDQ

TDC54D+Z

TDC54D+ZF

TDC54D+AZ

TDC54D+ZA

/

EDDQ

TS250GD+Z

TS250GD+ZF

TS250GD+AZ

TS250GD+ZA

/

Structure

TS280GD+Z

TS280GD+ZF

TS280GD+AZ

TS280GD+ZA

/

Structure

/

/

TS300GD+AZ

/

/

Structure

TS320GD+Z

TS320GD+ZF

TS320GD+AZ

TS320GD+ZA

/

Structure

TS350GD+Z

TS350GD+ZF

TS350GD+AZ

TS350GD+ZA

/

Structure

TS550GD+Z

TS550GD+ZF

TS550GD+AZ

TS550GD+ZA

/

Structure

4. Mechanical property:

Steel Grade

Y.S/MPA

T.S/MPA

EL./ ≥%

TDC51D+Z/ZM/AZ

240 ~ 380

270 ~ 500

22

TDC52D+Z/ZM/AZ

140 ~ 300

270 ~ 420

26

TDC53D+Z/ZM/AZ

140 ~ 260

270 ~ 380

30

TDC54D+Z/ZM/AZ

120 ~ 220

260 ~ 350

36


The coating types currently used for PPGI/PPGL steel coil include PE, PVDF, SMP, acrylic, PVC, etc.

PE

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

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,

Process

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

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

PVDF coatings have great color retention and corrosion resistance. Among the PPGI sheet coating for construction, it is the highest grade.

Acrylic

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
/um

Polyester

excellent

good

good

good

excellent

20

Acrylic

excellent

general

good

good

inferior

20

Silicon modified polyester

good

general

good

excellent

good

20

PVC sol

general

excellent

excellent

good

inferior

200

PVDF

general

excellent

excellent

excellent

inferior

25

HDP

good

excellent

good

excellent

good

20


coating process

Coils are wrapped with VCI / HDPE and packed with galvanised iron sheets on OD (outer diameter) and side of the coils with high tensile steel strapping and metallic seal. Eye to sky coils kept on wooden skid.

packing_coil

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