Substrates and PaintsSubstrates and PaintsDrexel Metals Corporation

204 Railroad Drive

Ivyland, PA 18974

Brian Partyka

www.drexmet.com

Substrates and PaintsSubstrates and Paints Substrates

– Hot Dipped Galvanized – Galvalume – Aluminum

Paint– The importance of Pre-Treatments– The importance of Primers– Paint Systems used in our industry.

Polyesters Siliconized Polyester Polyvinylidene Fluoride (PVDF) Plastisols

SubstratesSubstrates

Coated Carbon Steel – Hot Dipped Galvanized

G-90– Galvalume

AZ50Aluminum

– Alloy 3003 – 3004 - 3105– Temper – H14 – H24 – H34

Hot Dipped Galvanized Hot Dipped Galvanized

Zinc Coated Carbon Steel sheet that meets ASTM A653-96.

Coating Weight of G-90– By volume consists of a minimum thickness

of .80 oz of zinc per Sq Ft for both sides of the steel sheet.

Great Sacrificial AdvantagesNo applicable corrosion warranty

Galvanic ProtectionGalvanic Protection

Coating is 100% zinc by volumeHot Dipped Galvanized offers a desirable

characteristic with respect to corrosion by sacrificing itself to protect slit edges and scratches.

Generally has a smoother surface for paint application purposes.

Superior Formability.

Galvalume Galvalume By volume, Galvalume contains 80% aluminum in

the coating with the other 20% containing zinc and silicon additive.

Aluminum/Zinc Coated Carbon steel sheet that meets ASTM A792-96.

By volume consists of a minimum thickness of .50 oz per Sq Ft of AL/Zn for both sides of the steel sheet.

Coating Weight – AZ50 or AZ55 Great Corrosion Properties Good Sacrificial Advantages 20 year 6 month warranty against corrosion

Galvalume vs. HD GalvanizedGalvalume vs. HD Galvanized

Hot Dipped Galvanized – After 18 years, G-90

Galvanized exhibits red rust

Galvalume– Galvalume after 23 years –

No major sign of red rust.

Moderate Marine / Rural

Corrosion Losses of Galvalume and Corrosion Losses of Galvalume and Galvanized Sheets after 13 years exposureGalvanized Sheets after 13 years exposure

0 0.2 0.4 0.6 0.8 1

GALVALUME

H.D.GALVANIZED

RURAL

INDUSTRIAL

MARINE - 800 FT

SEVERE MARINE - 80 FT

Corrosion Loss (Mils)

Salt Spray Corrosion ResistanceSalt Spray Corrosion Resistance

With cut edges protected, the coating on Galvalume AZ50 lasts 5 to 10 times longer than the coating on G90 HD Galvanized.

Salt spray tests conducted with bare cut edges exposed, the corrosion resistance is typically three to four times that of G90 HD Galvanized.

Salt Spray test concerning the amount of Salt Spray test concerning the amount of hours to first significant rusthours to first significant rust

0

500

1000

1500

2000

2500

3000

Unprotected edges Protected Edges

Galvalume

H.D. Galvanized

Total # of Hours

Aluminum Aluminum Conforms to ASTM B209-96.Either:

– Direct cast from ingot.– Continuous cast from recycled scrap.

Advantages: – Light in weight.– Highly resistant to corrosion.– Excellent reflector of light and heat.– Highly workable and easy to form.

Aluminum Alloys and TempersAluminum Alloys and Tempers

Standard alloys for roofing and cladding; – 3003– 3004– 3105– 5052

Commonly used tempers; – H 14– H 24– H 34

Painted ProductsPainted Products

What a painted product consists of:What a painted product consists of:

Cold Rolled Steel

Zinc (HDG) orZinc-Aluminum

(Galvalume®)

Substrate

Pre-Treatment

Layer

Substrate

Pre-Treatment

Layer

Primer(0.20 - 0.25

mils)

TRINAR ®Topcoat

(0.70 - 0.90 mils)

Primer(0.20 - 0.25

mils)

Polyester Backer(0.30 - 0.50 mils)

Prepaint Cross-Section

Pre-TreatmentsPre-Treatments A liquid used to produce a corrosion-resistant,

organically bonded coating on Aluminum, Galvalume and Galvanized.

Incorporating a chromate rinse which is the major agent that allows the primer to bond to the substrate and helps prevent corrosion.

Benefits of Pretreatments:– Provides superior long term corrosion.– Effective on Aluminum, Galvalume and

Galvanized.– Coating quality is consistently maintained.

PrimerPrimerThe base layer of the paint applied by the

coater to the pretreated substrate. It is formulated to provide corrosion

protection to the base metal and to enhance adhesion between the top coat (paint) and the base metal.

Standard Primers: – Water Based– Urethane Based

What are the 4 major components What are the 4 major components that make up a paint systemsthat make up a paint systems

Resin Resin PigmentsPigmentsSolventsSolventsAdditivesAdditives

Resin Systems Resin Systems

The most important part of any paint system. The liquid glue of the paint system that surrounds

the pigment particles, protecting them from environmental pollutants such as airborne chemicals and salt.

Types of resin systems: – Polyester– Siliconized Polyester– Polyvinylidene Fluoride (PVDF)

PigmentsPigments Small solid particles added to a paint to enhance

appearance by providing color and /or improve physical (functional) properties of a paint.

Pigments are protected by the resin system. Types of Pigments:

– Ceramic Pigments– Earth Tones Pigments– Organic Pigments

UV Reflective Pigments

SolventsSolvents

This is the vehicle by which the pigment is transported to the metal surface

Actually evaporate during the curing process to permit the the formation of a paint film.

AdditivesAdditives

Any number of chemicals added to the paint, usually in small amounts to bring special effects to the paint.

Functions of the ComponentsFunctions of the ComponentsPigment Resin Solvent Additive

Aesthetics Properties Application Enhancement

Color Durability Stability Mar Resistance

Gloss Adhesion Viscosity Curing Agent

Adhesion Flexibility Compatibility Settling

Film Strength Color Retention Film Control Dispersion

Water Resistance Abrasion Adhesion Anti-Freeze

Corrosion Resistance Impact Resistance Leveling De-Foaming

Types of Paint Systems used in the field.Types of Paint Systems used in the field.

Polyester Siliconized PolyesterPolyvinylidene Fluoride (PVDF)Plastisols

Polyester Paint SystemsPolyester Paint Systems

A generic polymer coating with limited weathering performance.

Generally Using Organic Pigments.– End Uses:

Interior Applications– Home Appliances

– Lighting Fixtures

– Wall Panels

Siliconized Polyester Paint SystemsSiliconized Polyester Paint Systems

A generic coating type that represents a wide range of topcoats used on prepainted metal in construction.

The silicon extends the service life of the base polymer and improves weathering.

Generally Using Organic and Ceramic Pigments.– End Uses:

Metal Building Components. Agricultural and Corrugated panels.

Polyvinylidene Fluoride (PVDF)Polyvinylidene Fluoride (PVDF) The resin, which is a fluoropolymer, that is used as the

major vehicle (base resin) in the paint system. Paint chemistry of 70% by weight of PVDF resin. Exhibits superior

– Color retention– Chalk resistance– Corrosion Resistance – Flexibility – Stain Resistance – Overall exterior durability

Why PVDF is # 1Why PVDF is # 1

How it works!How it works!

Advance molecular structural of PVDF utilizes the following:– carbon-fluorine bond, the strongest bond

known in the chemical world combined with a carbon-hydrogen bond, which creates a structure that is extremely durable.

PVDF CoatingsPVDF Coatings

Architectural Coating that extends Architectural Coating that extends your buildings life, and keeps it your buildings life, and keeps it looking the way you designed it!looking the way you designed it!

PVDF vs. Other CoatingsPVDF vs. Other Coatings

Color Change

0

5

10

15

20

25

30

0 1 2 3 4 5 6 7 8 9 10 11

Florida Exposure Time (Years)

Co

lor

Ch

an

ge

(de

lta

E)

SMP

Polyester

PVDF

PVDF vs. Other CoatingsPVDF vs. Other Coatings

Gloss Retention

0

20

40

60

80

100

1 2 3 4 5 6 7 8 9 10 11

Florida Exposure Time (Years)

Glo

ss R

eten

tio

n (

%)

Polyester

SMP

PVDF

Weathering PropertiesWeathering Properties

0

1

2

3

4

5

ColorRetention

GlossRetention

ChalkResistance

HumidyResistance

Legend: 5 = Highest Performnce 1 = Lowest Performance

Polyester

SMP

PVDF

Prepainted Steel

Specifically,

Is the measured

affect of..

Sunlight, Ultra-Violet (U V) Radiation, Heat and

Moisture on

Physical PropertiesPhysical Properties

0

1

2

3

4

5

AbrasionResistance

ImpactResistance

FilmFlexibility

Hardness Mar

Legend: 5 = Highest Performnce 1 = Lowest Performance

Polyester

SMP

PVDF

Chemical PropertiesChemical Properties

0

1

2

3

4

5

Aids& Alkalies Oil Stain Water Immersion

Legend: 5 = Highest Performnce 1 = Lowest Performance

Polyester

SMP

PVDF

is measured in is measured in resistance to...resistance to...

PaintPaint

Visual Ratings are assignedaccording to ASTM D659. Ratings range from 10 - 0; where 10 is best.

is the residueresulting from Weathering Decomposition of paint films.

Definitions:Definitions:

is the change in a paintfilm color and appearance due to degradation from Ultraviolet Radiation in Sunlight.

is paint film appearance change due to Color Weathering.

Definitions:Definitions:

is expressed in calculated “delta E “ values or NBS Units which are measured and calculated according to ASTM D2244.

Values range from 0 to infinity, where 0 is best; i.e. no color change.

Definitions:Definitions:

Superior Chalking and Weathering ResistanceSuperior Chalking and Weathering Resistance

These panels exposed at an independent test fence facility in Southern Florida clearly demonstrate the superior weatherability of PVDF.

Elements of a PVDF WarrantyElements of a PVDF Warranty

PVDF Paint Warranties cover the following for 20 years:– Film Integrity– Color Fade– Chalk Resistance– Delamination

PVDF Paint Warranties do not cover the following: – Corrosion/degradation of

the substrate

Tobago HiltonTobago Hilton

Manufacture and Contractor:

Weathershield Caribbean Ltd.

Trinidad and Tobago

DREXEL METALS DREXEL METALS CORPORATIONCORPORATION

offers Akzo Nobel Trinar offers Akzo Nobel Trinar coated products! coated products!