What is the difference between PPGI and PPGL?

Zinc-aluminium (ZA) alloys are alloys whose main constituents are zinc and aluminium. Other alloying elements include magnesium and copper. This type of alloy was originally developed for gravity casting. Noranda, New Jersey Zinc Co. Ltd., St. Joe Mineral Co. and the International Lead Zinc Research Organization (ILZRO) were the main companies that pioneered the ZA alloys between the s and the s. They were designed to compete with bronze, cast iron and aluminium using sand and permanent mold casting methods. Distinguishing features of ZA alloys include high as-cast strength, excellent bearing properties, as well as low energy requirements (for melting).[1]

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ZA alloys make good bearings because their final composition includes hard eutectic zinc-aluminium-copper particles embedded in a softer zinc-aluminium matrix. The hard particles provide a low-friction bearing surface, while the softer material wears back to provide space for lubricant to flow, similar to Babbitt metal.[citation needed]

The numbers associated with the name represent the amount of aluminium in the alloy (i.e. ZA8 has 8% aluminium).[1]

Properties of various zinc aluminium alloys[1] ZA8 ZA12 ZA27 Mechanical properties Sand cast Permanent mold Sand cast Permanent mold Sand cast Permanent mold Ultimate tensile strength [ksi (MPa)] 38 (263) 32-37 (221-255) 40-46 (276-317) 45-50 (310-345) 58-64 (400-441) 45-47 (310-324) Yield strength - 0.2% offset [ksi (MPa)] 29 (200) 30 (206) 31 (214) 39 (269) 54 (372) 37 (255) Elongation [% in 2"] 1-2 1-2 1-3 1-3 3-6 8-11 Shear strength [ksi (MPa)] - 35 (241) 37 (255) - 42 (290) 33 (228) Hardness [Brinell] 85 85-90 89-105 89-105 110-120 90-110 Impact strength [ft·lbf (J)] 156 (20) - 193 (25) - 353 (47) 433 (58) Fatigue strength rotary bend in 5x108 cycles [ksi (MPa)] - 7.5 (52) 15 (103) - 25 (172) 15 (103) Compressive yield strength 0.1% offset [ksi (MPa)] 29 (199) 31 (214) 33 (227) 34 (234) 48 (331) 37 (255) Modulus of elasticity [psi x 106 (GPa)] 12.4 (85.5) 12.47 (85.5) 12.07 (82.7) 12.07 (82.7) 11.37 (77.9) 11.37 (77.9) Poisson's ratio 0.29 0.29 0.30 0.30 0.32 0.32 Physical properties Sand cast Permanent mold Sand cast Permanent mold Sand cast Permanent mold Density [lb/in3 (g/cm3)] .227 (6.3) 0.227 (6.3) 0.218 (6.0) 0.218 (6.0) 0.181 (5.0) 0.181 (5.0) Melting Range 375-404°C (707-759°F) 375-404°C (707-759°F) 377-432°C (710-810°F) 377-432°C (710-810°F) 376-484°C (708-903°F) 376-484°C (708-903°F) Electrical Conductivity [S/m (%IACS)] 1.61 (27.7) 1.61 (27.7) 1.64 (28.3) 1.64 (28.3) 1.72 (29.7) 1.72 (29.7) Thermal Conductivity [BTU/hr/ft2/°R (W/m/K)] 66.3 (114.7) 66.3 (114.7) 67.1 (116.1) 67.1 (116.1) 72.5 (125.5) 72.5 (125.5) CTE [68-212°F μin/in/°R (100-200°C μm/m/K)] 12.9 (23.3) 12.9 (23.3) 13.4 (24.2) 13.4 (24.2) 14.4 (26.0) 14.4 (26.0) Specific Heat [BTU/lb/°R (J/kg/K)] .104 (435) .104 (435) .107 (448) .107 (448) .125 (523) .125 (523) Pattern of Die Shrinkage [in/ft (mm/m)] 1/8 (10.4) 1/8 (10.4) 5/32 (13.0) 5/32 (13.0) 5/32 (13.0) 5/32 (13.0) Chemical Specification (per ASTM) (% by Weight)[1] ZA8 ZA12 ZA27 Composition Ingot Casting Ingot Casting Ingot Casting Al 8.2-8.8 8.0-8.8 10.8-11.5 10.5-11.5 25.5-28.0 25.0-28.0 Mg .020-.030 .015-.030 .020-.030 .015-.030 .012-.020 .010-.020 Cu 0.8-1.3 0.8-1.3 0.5-1.2 0.5-1.2 2.0-2.5 2.0-2.5 Fe (max) .065 .075 .065 .075 .072 .075 Pb (max) .005 .006 .005 .006 .005 .006 Cd .005 .006 .005 .006 .005 .006 Sn (max) .002 .003 .002 .003 .002 .003 Ni (other)x10 - - - - - - Zn Bal Bal Bal Bal Bal Bal Color Code ASTM B908 Blue Blue Orange Orange Purple Purple

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Pre-Painted Galvanized Iron Steel, also called PPGI, and Pre-Painted Galvalume Steel, PPGL, are two different types of color coated steel. Both PPGI and PPGL are used in a wide range of industries such as construction, transportation, and the appliance industry. They are both very similar but still have unique differences.

Different Type of Substrate 

Galvanized steel, PPGI, is coated completely with zinc, while Galvalume steel, PPGL, is coated with aluminum, zinc, and a small amount of silicone. This provides superior corrosion resistance and durability over the typical galvanized coating. This is the biggest difference between PPGI steel and PPGL, which is the reason for the differences in many features such as weight, product life, appearance, price, and applications.

Weight Difference of PPGI vs PPGL 

Because the specific weight of aluminum is less than the specific weight of zinc, the aluminum zinc coating on PPGL will weigh less with the same coating thickness. Which also means that the Al-Zn coating, with the same weight, can cover 3% more space than PPGI.

Service Life 

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Both zinc and the aluminum zinc coating help to protect metal against rusting to prolong product service life. With PPGI, when the zinc coating corrodes, the base metal will become damaged. A galvanized PPGI sheet may last approximately 10 to 15 years.

With the aluminum zinc alloy on PPGL, the aluminum rich material will corrode slowly while the zinc rich portion will corrode preferentially. This provides added corrosion resistance over strictly the zinc coating of PPGI. PPGL can last up to three times longer than PPGI.

Difference in Appearance 

The PPGL surface will appear to be smoother than the surface of PPGI.  Because aluminum has better adhesion properties than zinc, PPGL may not require the same pretreatment for painting as galvanized sheets require.

Heat Tolerance and Erosion 

PPGL offers better heat resistance than PPGI, with the ability to withstand temperatures up to 315°C. Because PPGL provides improved corrosion resistance with a dense layer of aluminum the base metal is further protected against erosion. The cut edge of PPGL is less protected, however, due to the honeycomb structure of the coating which does not sufficiently protect exposed edges.  A coating can be applied to these exposed edges for added protection.

Applications for Both PPGI and PPGL 

Both PPGI and PPGL are used in various roofing and wall paneling applications. Because PPGL better corrosion resistance it is more suitable for harsh outdoor environments such as coastal areas with exposure to seawater. PPGL also provides excellent heat resistance which makes it a popular material for ovens and chimney pipes.

Difference in Price 

The price for PPGL is typically slightly more than PPGI due to added performance and fewer manufacturers. 

Quality Adhesives and Coatings for Prepainted Metal

Working with an experienced industrial adhesives and coil coating supplier will help you to understand your options in the various coatings available for prepainted metal. Universal Chemicals & Coatings, Inc., UNICHEM, is a custom chemical and coatings provider with more than 50 years of experience. UNICHEM offers high-performance functional coatings and laminating adhesives for steel sheets manufactured with a continuous coil coating process. We offer the leading high-tech engineers in the industry who provide troubleshooting and customized chemistry solutions to meet your adhesive or coating needs.

UNICHEM has been a custom chemical and coating technology leader, recognized for improving process efficiencies and product quality. We follow a strict quality policy with proprietary procedures in addition to our ISO: registration. Contact us with any questions on the best types of adhesives and coatings for your prepainted, coil coating metal process.

 

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