Grp sheets

Types of grp sheets

GRP sheets are made with glass reinforced plastic (GRP) which is also known as fiberglass reinforced plastic (FRP). The material is composite made by reinforcing epoxy, polyester, or vinyl esters resins with glass fibers. The resultant material has high strength, low weight, and good chemical resistance. It is also weather resistant and opaque.

Here are the different types of grp sheets available:

Polyester grp sheets

These are made using a liquid resin that is mixed with a hardener and poured over the glass fiber layer. The resin hardens and binds the fiber strands. These are the most common type of grp sheets, favored for their affordability and good mechanical properties.

Epoxy grp sheets

The difference between epoxy GRP sheets and polyester GRP sheets is the type of resin used. Epoxy grp are more expensive but better for applications that need higher strength and resistance to chemical degradation.

Vinyl ester grp sheets

Vinyl ester grp sheets are made using vinyl ester resins. The resins are a hybrid of polyester and epoxy resins. They are more expensive than polyester resins but cheaper than epoxy resins. They offer better resistance to chemicals like acids and bases as well as better strength. grp sheets for sale are available in:

Ortho polyester grp sheets

These are the most basic type of grp sheets. They are made from orthophthalic polyester resin. They are known for good mechanical properties and resistance to water and UV.

Iso polyester grp sheets

ISO polyester sheets are made with isophthalic polyester resins. Iso grp sheets are stronger and more resistant to heat and chemicals than ortho polyester grp sheets.

Uns grp sheets

These are made using building styrene resins which are not commonly used due to their lower performance compared to other options.

Industry applications of grp sheets

GRP sheets are increasingly popular due to their high strength-to-weight ratio, corrosion resistance, and versatility. Below are the key industries that utilize grp sheets:

Construction industry

GRP sheets are increasingly used in the construction industry as an alternative to steel, wood, and concrete in structural applications. Their corrosion resistance and lightweight nature make them ideal for building facades, roofing, and window frames.

Automotive industry

Glass reinforced plastic sheets are widely applied in the automotive sector for manufacturing body panels, interior components, and structural parts. Since they are lighter than metals while retaining strength, they contribute to fuel efficiency and improved performance.

Aerospace industry

In the aerospace industry, grp sheets are applied in the manufacturing of aircraft components such as wing and fuselage sections. The lightweight nature and strength of the sheets help in fuel efficiency.

Marine industry

GRP sheets are extensively used in the marine industry for boat and ship hulls, decks, and other components. They offer corrosion resistance, durability, and lightweight properties. They are ideal for watercraft exposed to harsh marine environments.

Electrical industry

Grp sheets are used as electrical insulators and for housing electronic components. Their excellent electrical insulating properties and resistance to moisture and corrosion make them ideal for protecting sensitive components in outdoor electrical equipment.

Medical industry

In the medical industry, grp sheets are used for constructing hospital furniture, equipment, andPanels for modular cleanrooms. Their easy-to-clean surfaces and resistance to chemicals and moisture are ideal in this industry.

Sporting goods industry

GRP sheets are used in sporting goods such as surfboards, bicycles, helmets, and tennis rackets. The lightweight and durable materials improve the performance and safety of these products.

Product specifications and features of grp sheets

Physical properties

• Thickness: GRP sheets generally come in thicknesses ranging from 1mm to 30mm. The most common thicknesses are 3mm, 5mm, 10mm, and 25mm. The choice of thickness depends on the application requirements.
• Length and width: GRP sheets are typically manufactured in standard sizes of 2m x 1.2m, 3m x 1.0m, and 4m x 1.2m. However, they can be customized in measured lengths and widths depending on customer requirements.
• Transparency: GRP sheets can vary from transparent to opaque, depending on the glass fiber and resin used. Clear sheets typically allow up to 90% light transmission. Opaque sheets allow less than 1% light transmission.
• Weight: GRP sheets typically weigh between 6.5kg to 15kg per square meter, depending on their thickness and type. For example, a 3mm thick sheet weighs around 6.5kg/m², while a 25mm thick sheet weighs around 15kg/m².

Mechanical properties

• Tensile strength: The tensile strength of GRP sheets varies widely depending on the type of resin and glass used. Standard composite GRP sheets usually have tensile strengths of 75 to 100N/mm².
• Flexural strength: Flexural strength is a key indicator of how well a material can resist bending. Like tensile strength, flexural strength varies based on the specific materials used in the GRP sheet. Typical flexural strength values for composite GRP sheets are 160 to 260N/mm².
• Load-bearing capacity: Load-bearing capacity refers to the sheet's ability to support weight without deforming or breaking. It is affected by thickness, resin type, and fiber orientation. Thicker sheets and those reinforced with more fibers typically have better load-bearing capacities.

How to install grp sheets

• Surface preparation: The area where the GRP sheet will be installed should be sufficiently prepared. Ensure the surface is clean and free of debris. For roofing applications, ensure the underlying structure is sound and watertight.
• Measuring and cutting: Measure the area where the sheet will be installed. Mark and cut the sheet to fit the measured dimensions using a circular saw or jigsaw. Wear a mask and goggles to protect against GRP dust.
• Securing the sheets: Position the cut GRP sheet over the surface and secure it with screws or adhesive as appropriate. Use screws at regular intervals and along edges. If using adhesive, apply evenly and press the sheet down firmly.
• Finishing touches: For roofing applications, ensure all seams are properly sealed. Use a sealant or adhesive to seal between sheets. Once secure, inspect the installation to ensure it is watertight and properly aligned.

How to choose grp sheets

Here are some factors business owners should consider when buying grp sheets for sale:

Type of resin

The resin used determines the grp sheet's strength, chemical resistance, and temperature tolerance. For example, vinyl esters have better chemical resistance than polyester resin and may be preferred in chemical processing facilities.

Type of glass fiber

Different glass fibers offer different benefits. E-glass is the most common due to its balance of strength and cost. S-glass offers higher strength but is more expensive. They should stock both types to cater to customers who require strength and budget considerations.

Sheet finish

Smooth finishes provide good aesthetics and chemical resistance, while textured finishes improve grip and may be better for conditioned spaces. Consider the end-use conditions to determine the finish to stock.

Sheet thickness

Thicker sheets offer better load-bearing and impact resistance but are heavier and harder to handle. Terkos should stock a range of thicknesses to cater to various construction projects and industrial applications.

Using templates to minimize wastage

If customers intend to install the sheets in high-traffic areas or on floors that need extra protection from impact or chemicals, they should consider buying thicker or additional protective layer sheets.

Handling and storage considerations

• GRP sheets should be stored flat and kept dry to maintain their integrity. If exposed to rain or moisture, the resin will degrade, ruining the sheet.
• The sheets must be handled carefully to prevent cracking, especially around the edges.

Q&A

Q1. Are grp sheets good for roofing?

A1. Yes, GRP sheets are an excellent choice for roofing. GRP is lightweight yet strong, making it easy to handle without compromising durability. It is waterproof, which makes it ideal for a flat roof where water pooling is a concern.

Q2. What tools are required to cut grp sheets?

A2. Cutting tools used include circular saws, jigsaws, or handheld cutters for straight cuts. For intricate shapes, a dremel or coping saw works well. Sanding the edges after cutting prevents sharp areas. The cutting area should be well-ventilated and using a mask is a must to prevent inhaling cut dust.

Q3. Which is better, metal or grp?

A3. While both are strong materials, GRP is corrosion-resistant and doesn't conduct electricity, making it safer in certain environments compared to conductive metals. GRP is also lighter, easier to shape, and non-thermal, which is better for energy efficiency.

Q4. What is the lifespan of grp?

A4. GRP has a lifespan of approximately 25-30 years. Its longevity may vary depending on factors like environmental conditions, the quality of materials used, and maintenance. Its corrosion resistance lets it last longer than metal in adverse environments.

Q5. Is it easy to install grp?

A5. Yes, installing GRP is a straightforward process. It involves preparing the surface, measuring and cutting the sheet to fit, and securing it with adhesive or fasteners. For roofing, a resin and hardener mixture is applied to seal and reinforce the structure.