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Galvanized iron sheets or GI Sheets are manufactured in different types to meet the diverse needs of their users. This is the case as they are acquired and used depending on the thickness, application, and shape. Outlining the various types emphasizes the product's versatility and practicality, making it a preferred choice for many construction applications.
The types include:
Regular Spangle Sheets
These types of GI sheets are characterized by the crystalline spangles of varying dimensions on the surface of the sheet. The spangles are formed during the galvanization process as the zinc crystals grow on the treated sheets' surface. Owing to their decorative outlook, Users prefer these sheets, especially when aesthetics are a priority. These users include those in roofing and cladding applications. Their durability and resistance to rust, coupled with the beautiful finish, also make them an excellent choice for users.
Mini-Spangle Sheets
Mini-spangle GI sheets are a variation of the regular spangle sheets. The main difference between the two is that the former's spangles are smaller. This results in a much smoother appearance than its counterpart. However, it still retains the spangle texture GI users like for its enhanced corrosion resistance. They are widely used in construction, automotive, and appliance manufacturing industries. This is mostly when a less rough but still high-quality galvanized surface is required.
Single-Postin Spangle Sheets
Out of all GI sheets, Single-postin sheets are the smoothest as they undergo a special galvanization process that almost eliminates the formation of spangles. Therefore, their surface is most smooth and resembles regular galvanized sheets. Even without the spangles, these sheets provide excellent protection from rust and corrosion. Their smooth surface appeals more to users, especially in applications where a flat surface is preferred. Some of their applications include refrigerators, air conditioning units, and other household appliances.
Fibre Spangle Sheets
However, fibre spangle sheets are a little bit different than regular spangle sheets. This is because they involve a unique galvanization process that creates a more fibrous, larger textured spangle. It is this combination that offers a highly efficient corrosion-resistant property. Thus, these sheets are generally used in highly humid or corrosive environments. An example is coastal regions.
Anti-Fingerprint Sheets
At times, GI sheets are coated with an anti-fingerprint polymer layer. This is to minimize or completely eliminate the formation of unsightly fingerprints and other smudges. Besides their primary function of preventing corrosion, the polymer layer greatly enhances the practicality of the sheets in frequent touch applications. Such applications include doors, handrails, and interior paneling. The layer makes maintenance much easier and reduces the chances of rust developing in areas that are touched frequently.
GI sheets have many unique features that make them ideal for a wide range of construction and industrial applications. These features include the following:
Corrision resistance
The primary distinctive function of the GI sheet is its resistance to corrosion which is brought about by the zinc coating. It protects the underlying steel from moisture, oxidizing, and other corrosive elements. This makes them ideal for outdoor use and in places with a high humidity level. Also, they are suitable for long-term use in different water and weather conditions.
Durability
The durability of the GI sheets also extends beyond just corrosion. This is because they are manufactured to be highly tough and resistant to wear, tear, and physical damage. Their strength comes from the combination of galvanized coating and cold-rolled or hot-rolled steel sheet bases.
Flexibility and Lightweight
All GI sheets are flexible despite their strong nature. They can be cut, molded, and made into different dimensions, including structures of varying complexity. Additionally, they are lightweight in comparison to other steel. This makes them easier to transport and install. Their lightweightness also aids in reducing the overall load on many structures.
Cost-effective
For their effective corrosion resistance and durability, GI sheets come at a lower zinc coating and sheet price as compared to other premium alternatives. This makes them ideal for budgets in construction and manufacturing industries. Moreover, the longevity of the GI sheets contributes to their overall cost efficiency.
Versatile Applications
Galvanized iron sheets are used widely in multiple industries. These industries include construction for roofing, wall cladding, and fencing, as well as automotive for car body panels, and manufacturing for appliances and industrial equipment. Their adaptability to all these applications is one of their merits that makes them so popular.
Thermal and Acoustic Properties
Alongside their most common application for roofing and cladding in construction, GI sheets provide effective thermal insulation. They will keep indoor temperatures consistent in the first place. Additionally, they offer some level of sound insulation, reducing noise transmission from outside to the inside of a building.
When purchasing GI sheets, buyers should consider the following factors. After knowing and putting into consideration the following factors, buyers will be able to select suitable Galvanized Iron Sheets based on their respective applications, requirements, and budget:
Thickness and Gauge
The strength and usability of the GI sheets are directly affected by their thickness or gauge. The thicker the sheet the higher their strength would be. However, the more difficult it will be to work with. Buyers should select the ideal thickness depending on their intended use. For example, roofing sheets that have a thickness ranging from 0.3 mm to 0.8 mm are ideal for roofing.
Zinc Coating Weight
The level of the corrosion resistance of GI sheets is determined by the zinc coating level. It is because the more the coating level the higher the corrosion resistance. For most construction applications, the 120 GSM and 275 GSM coatings are adequate. Nevertheless, extreme environments will require a higher level of coating.
Surface Finish
The surface finish of the GI sheet is important if it is to be used in the interior and exterior of buildings. In such cases, finishes like mini-spangle or postin provide aesthetic value. They are also resistant to fingerprint smudges. So, the type of surface finish will affect the outlook as well as the functionality.
Application Requirements
The purpose that the GI sheets are to be used for will also greatly affect the sheet to purchase. For instance, those intended for roofing should be watertight and have good resistance to rust. On the other hand, sheets for industrial use should be strong enough even when constantly exposed to chemicals.
Standards and Certifications
Only purchase GI sheets that meet the required local and international quality standards. In this case, sheets that are manufactured in areas with stringent manufacturing policies are likely to be of higher quality. Moreover, the certification level of zinc used in galvanization will indicate quality and corrosion resistance.
Cost and Supplier Reputation
Apart from the other factors, cost is important when it comes to the purchasing process. Buyers have to balance between the cost and quality of the sheets. As for supplier reputation, only deal with suppliers who have proven to be able to provide high-quality products consistently as well as have positive customer experiences.
Galvanized sheets have multiple uses across different industries and applications. This is due to the durable and corrosion-resistant nature of the sheets. Some of the common applications include the following:
Construction Industry
One of the main industries where GI sheets are used is construction. They are used for roofing, wall cladding, and ceiling panels. Their resistance to rain, moisture, and salt air allows them to be used in both interior and exterior applications. Hence, they are ideal for these applications. In fact, they are commonly used to make roofing sheets, gutters, downspouts, and decking.
Industrial Applications
GI sheets are also used in the manufacturing of equipment, machinery, and storage tanks. In this case, they are used for making parts that are required to be resistant to moisture and other elements. In these applications, the sheets provide an excellent balance between strength and workability for which they are used far widely.
Automotive Industry
People use Galvanized Iron sheets in the automotive industry to manufacture body panels, frames, and other components. The zinc coating protects the metal from rusting, mainly in their parts exposed to water and road chemicals. Normally, it combines strength, flexibility, and corrosion resistance.
Appliance Manufacturing
They also find extensive usage in the production of household and industrial appliances. The appliances include washing machines, dryers, and refrigerators. In these applications, the sheets are used for internal and external panels. Usually, it is the galvanized coating that increases the appliances' lifespan by minimizing rusting.
Packaging Materials
GI sheets are used to manufacture containers, drums, and specialized packaging for industrial products. Often, their strength and resistance to chemicals make them suitable for packaging materials that are to hold liquids and solids in dangerous areas.
Electrical Equipment
People also use Galvanized Iron Sheets in electrical enclosures and protective casings. They usually help prevent corrosion in areas where electrical equipment is exposed to elements like moisture and dust. In fact, commonly they are used in outdoor electrical systems, power distribution, and communication networks.
Fencing and Gates
People use GI sheets for making gates and fencing. Therefore, they are commonly applied in agricultural, residential, and industrial perimeter fencing. Moreover, the rust resistance of the zinc coating contributes to the maintenance of long-term durability.
No, they are not the same. GI sheets, for instance, are galvanized iron sheets that are coated with zinc to resist rust and corrosion. On the other hand, PPGI sheets are pre-painted galvanized iron sheets. They are first galvanized with zinc like GI sheets. However, they are then painted with one or more layers of protective paint. This provides aesthetic benefits alongside additional corrosion resistance.
As compared to other materials, zinc coated sheets have the following benefits. They include being cost-effective, offering durable corrosion resistance, and providing versatility in the manufacturing process. People also use them widely in construction, automotive, and appliance applications.
Apart from the usual zinc coating, the anti-fingerprint GI sheets have a polymer coating. It minimizes the fingerprints and smudges' likelihood. Therefore, it is easier to maintain and have a neat outlook and functionality. This makes them more worthwhile, especially for those applications that are frequently touched.
PPGI as well as anti fingerprint GI sheets are both processed after galvanization. One is coated with a painted polymer layer, while the other one has a polymer coating that minimizes fingerprints. Therefore, each has its unique benefit. Users mainly choose PPGI sheets because of their decorative and aesthetic benefits. On the other hand, anti fingerprint sheets are suitable for maintenance purposes.
