The Ultimate Guide to Choosing FRP Tank Manufacturers

14 Apr.,2025

 

The Ultimate FRP Tank Buyer's Guide : What You Need to Know

Fiberglass Tanks, also referred to as Fiberglass Reinforced Plastic (FRP) Tanks, are acquiring prominence in a variety of industries due to their exceptional storage capacities. The combination of glass fibers and resin provides these tanks with exceptional strength while also allowing for size, shape, and configuration customization. FRP tanks provide significant advantages over conventional tank materials for both above- and below-ground applications.

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FRP tanks have an exceptional strength-to-weight ratio. The exceptional strength of these tanks, despite their light weight, allows them to withstand high internal and external pressures. This makes FRP tanks appropriate for applications requiring durable storage solutions, such as water treatment facilities, oil and gas facilities, and industrial processing plants.

This buyer’s guide is intended to provide an in-depth comprehension of FRP tanks, including their construction, benefits, applications, and essential purchasing considerations.

How are Fiberglass Tanks Made?

The manufacturing procedure for FRP tanks involve layering glass fibers and resin to create a composite material. Here are the five stages involved in the construction of FRP chemical storage tanks: 

  • Mold Preparation: 

In accordance with the intended FRP tank design, a mold or tooling is prepared. molds are typically fabricated from metal or fiberglass and are meticulously cleansed to ensure a uniform surface finish.

  • Application of Gel Coat

The mold is coated with a gel coat, which functions as a protective layer and provides the FRP chemical storage tanks with a smooth and aesthetically appealing surface. Typically, the gel coat is pigmented and resistant to UV degradation.

  • Layering  

In the mold, layers of fiberglass reinforcement material, such as woven filaments, mats, or fabrics, are layered with resin. The fibers are then saturated with a resin such as polyester, vinylester, or epoxy to form a composite structure. This can be accomplished using manual lay-up or resin infusion techniques.

  • Curing

After the fiberglass and resin layers have been applied, the FRP tank is permitted to cure. Curing is the process of subjecting the tank to specific temperature and humidity conditions in order to facilitate the resin’s hardening. This procedure allows the composite to solidify and bond, resulting in a durable and sturdy tank.

  • Finishing and Quality

After the tank has cured, it is meticulously removed from the mold and inspected for quality. To accomplish the desired shape and uniformity, any extraneous material or imperfections are sanded. The tank is then subjected to quality control procedures to ensure that it conforms to industry standards and customer specifications. This includes inspections, dimension reviews, and numerous performance and structural integrity tests.

Applications of Fiberglass (FRP) Tanks

FRP tanks have numerous applications in numerous industries. Here are some frequent uses of FRP tanks:

  • FRP Water Tanks

FRP tanks are commonly used in the treatment process and sediment. In various applications, FRP panel tanks, also known as sectional tanks, are used to store water. These tanks are constructed by putting together fiberglass and resin panels individually. Common applications include water supply, irrigation, firefighting, and industrial water storage.

For municipal water storage, including potable water storage, fire protection, and water distribution systems, FRP panel tanks are utilized. Additionally, they are utilized in industrial applications requiring massive water storage.

  • FRP Chemical Storage Tanks

FRP tanks are commonly used for chemical storage, solvents, alkalis, acid and other corrosive materials. Their superior resistance to corrosion secures the integrity of stored compounds and prevents contamination. Most substances are non-reactive with FRP tanks. This means that the FRP chemical storage tanks do not interact chemically with the substances being stored, preventing any unintended reactions or contaminants that could compromise the chemical composition or properties of the stored materials.

The high chemical compatibility of FRP tanks makes them suitable for a wide variety of corrosive substances. They are resistant to the adverse effects of storing acids, alkalis, solvents, oxidizers, corrosive vapors, and other chemicals. This compatibility is essential for preserving the integrity and quality of the stored compounds.

  • Food and Beverage Industry

FRP tanks are utilized in the food and beverage industry for the storage of beverages, culinary ingredients, and liquid processing. They adhere to sanitary regulations and standards, ensuring the safety and preservation of food and beverage products.

To ensure the safety and purity of products, the food and beverage industry is governed by stringent sanitary standards and regulations. These standards are incorporated into the design of Fiberglass tanks, making them suitable for storing food-grade materials. They are made from non-toxic, non-absorbent, and resistant to microbial growth materials, ensuring that stored products are not contaminated or compromised.

  • Pulp and Paper Industry

For pulping, bleaching, and other procedures, the pulp and paper industry relies on various compounds. These chemicals, such as acids, alkalis, chlorine compounds, and oxidizing agents, can be safely stored in FRP chemical storage tanks.

For the storage of compounds used in the pulping and sterilizing procedures, FRP tanks are utilized. Pulping entails the destruction of wood fibers to produce pulp, which is then subjected to bleaching. Fiberglass containers can store commonly used compounds such as caustic soda (sodium hydroxide), sodium sulfide, sodium hydrosulfite, hydrogen peroxide, and chlorine dioxide. The chemical compatibility and corrosion resistance of FRP tanks are essential for preserving the integrity of these substances and preventing leakage or spillage.

  • Pharmaceutical and Biotechnology Industry

FRP chemical storage tanks are used to store processed substances, chemicals, and purified water in the pharmaceutical and biotechnology industries. They are appropriate for use in cleanroom environments and conform to regulatory specifications.

Various substances and compounds used in pharmaceutical and biotechnology manufacturing processes are stored in FRP tanks. These may include solvents, reagents, buffers, acids, bases, and other basic materials utilized in drug formulation, synthesis, purification, and other laboratory or manufacturing processes. The superior corrosion resistance of FRP tanks prevents chemical reactions, contamination, and decomposition of the stored substances.

Purchasing Consideration for Fiberglass Tanks

When purchasing FRP tanks, there are a number of factors to consider to ensure that you select the appropriate product from fiberglass tanks manufacturers. Consider the following when purchasing fiberglass tanks:

  • Material and Construction

When contemplating the material and construction of FRP tanks, it is essential to consider the material quality and manufacturing process. Ensure that the tanks are constructed of high-quality fiberglass materials, such as E-glass or C-glass, which offer superior tensile strength and corrosive resistance. 

The structural integrity of the Fiberglass tanks is ensured by the combination of high-quality fiberglass tank materials and suitable fabrication processes. The fiberglass reinforcement, bonded with a substance that resists corrosion, creates a sturdy and resilient tank structure. This structural integrity allows the tanks to withstand external pressures, temperature fluctuations, and environmental conditions without deforming or failing. Choose fiberglass tanks from reputable fiberglass tank manufacturers who place a premium on structural integrity.

  • Customization Options

It is essential, when contemplating FRP tanks, to evaluate the customization options provided by the fiberglass tanks manufacturers to ensure that they meet your specific needs. Check if the manufacturers of fiberglass tanks offer a variety of sizes and shapes to accommodate your storage requirements. Whether you need a small tank for a small space or a large tank for mass storage, a manufacturer that offers a variety of sizes can meet your needs. 

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Look for FRP tank manufacturers in India or global suppliers who offer expert consultation during the process of customization. Experienced fiberglass tanks manufacturers can evaluate your unique storage requirements, advise you on the most suitable customization options, and assist you in making informed decisions. Their expertise can assist in optimizing the design and performance of FRP tanks for your application.

  • After-sales Warranty and Support

It is essential to consider the fiberglass tanks manufacturer’s warranty and availability of after-sales support. Inquire about the warranty to FRP tanks manufacturers in India. A reputable manufacturer should provide a warranty that covers manufacturing flaws and performance issues. Depending on the intended application of the tank and the manufacturer’s policies, the warranty period can range from a few years to several decades. Ensure that the terms and conditions of the warranty are explicitly stated and that you understand the coverage provided.

Determine whether the fiberglass tanks manufacturers provide technical support as part of their after-sales service. Technical assistance may include instructions for installation, assistance with operational issues, and maintenance and repair recommendations. Having access to skilled technicians who can provide technical knowledge can be invaluable for assuring the correct operation and durability of the FRP tank.

Conclusion

What Should I Prepare Before Choosing FRP Storage Tanks

Purchasing a high-performance chemical storage tank is a significant investment for your company, and choosing the right tank for your needs isn’t always an easy decision. If you’re deciding between a fiberglass reinforced plastic (FRP) tank and crosslinked polyethylene (XLPE) tank, be sure you understand the differences between them and know what to expect in terms of cost, maintenance, service, delivery times, and protection.

FRP tanks are coated with an interior chemical resin. Their structural layer is composed of chopped glass fiber or filament-wound fibers and resin. XLPE is a thermoset resin specifically engineered for critical applications like chemical storage.

Let’s explore seven important benefits of XLPE over FRP chemical tank systems. Evaluate these benefits thoughtfully as you select your next chemical storage tank system.

XLPE Offers Seamless Construction for Greater Strength

Fiberglass Reinforced Plastic tanks are filament-wound or hand laid up. Fibers are intertwined into a nexus veil that is wound onto a spool. In this spool, the fibers create a fiberglass layer with added resin, which keeps them bound together. Fiberglass tanks are constructed with seams (due to the winding).

This method of manufacturing inherently creates the opportunity for weak points that are vulnerable to leaks. In addition, FRP tank manufacturers  add the top and bottom of the tank post-production, further increasing the risk of leaks.

Conversely, crosslinked polyethylene tanks are rotationally molded, producing a one-piece construction with no vulnerable seams. As opposed to fiberglass tanks, rotationally molded tanks are a homogenous, one-layer construction. This one layer construction eliminates potential weak spots in the tank structure and eliminates wicking or delamination that can occur from chemical attack or poor construction.

Chemical Wicking into the Tank’s Walls

Because of the structure of fiberglass, harsh chemicals can wick into fiberglass tank walls over time, compromising the tank life. Eventually, the chemical resin barrier on the interior wall can be compromised, and the chemical can make its way into the structural area of the tank. This structural area usually isn’t designed to provide the chemical compatibility that the interior resin provides. As a result, the fibers can begin to break down, and eventually, the tank fails.

While there are repairs that you can sometimes make, they’re usually only temporary. Eventually you will need to replace your fiberglass tank.

That’s one of the reasons that most fiberglass tanks don’t have the same warranty Poly Processing provides for our corrosion resistant tanks. Even the harshest chemicals can’t seep into high-density crosslinked polyethylene tank walls.

Cost of Tank Ownership

Fiberglass tanks are more costly than crosslinked polyethylene tanks, sometimes three to five times more. Delivery times can be three to four times longer as well. FRP storage tanks have a higher upfront cost in general, and the lifetime cost of ownership is higher. FRP tanks require more maintenance than crosslinked polyethylene tanks, costing you time, resources and money.

Because FRP tanks are painted or have a gel coat on the outside of the tanks, they need to be recoated on occasion. This is especially true for outdoor tanks because the fiberglass requires UV protection to prevent additional wear. XLPE tanks never need to be painted or coated, because the entire wall has UV additives throughout the tank.

Special Handling Considerations

Fiberglass tanks are inflexible, which makes them vulnerable to cracking. Extreme care must be taken anytime you move an FRP tank, especially during installation. As a result, these tanks often sit on a special wicking mat so that any leaks in the bottom of the tank can be easily seen as the chemical spreads throughout the mat.

Crosslinked polyethylene tanks are much more durable, and can easily be moved at any time. In fact, our durability testing drops filled tanks from as high as 45 feet above the ground—without splitting or leak leaking.

Molded Tank Fittings vs. Traditional Attachments

All FRP fittings are added onto the tank after production, which creates the opportunity for leaks at the attachment point. Poly Processing’s IMFO® (Integrally Molded Flanged Outlet®) fitting prevents this problem because the fitting is integrally molded into the tank itself. It’s not an attachment, but a single part of the chemical tank. This innovation removes potential stress points and allows no opportunities for leaks.

NSF/ANSI 61 System Certification

Poly Processing is committed to ensuring that our polyethylene chemical storage systems meet industry standards and are NSF/ANSI 61 certified. In fact, among chemical storage tank manufacturers, Poly Processing is the only one with a complete chemical storage tank system that is NSF/ANSI-61 certified. Currently, we have NSF 61 Certification for 38 of the most popular water treatment chemicals on our XLPE tank systems. Additionally, our certifications cover XLPE tanks with the OR-® System.

Most FRP tanks hold the basic NSF/ANSI 61 certification for only one specific application, potable water.

Delivery Lead Times

We know that delivery times are critical to our customers. That's why we work diligently to ship every order within 8-12 weeks. Most FRP tank manufacturers and poly tank manufacturers are giving their customers a 24-40 week shipping window based on lack of raw material sourcing, Covid-19, etc. At Poly Processing Company, we can deliver your product in one third of that time.

Before you order an FRP tank, make sure the manufacturer gives you the price and the lead time up front. Otherwise you could be in for a rude awakening.

Trusted, consistent, and expeditious, Poly Processing’s rotationally molded crosslinked tanks are by far the toughest polyethylene tanks offered to the chemical market. With our 6-8 week delivery window, we strive to deliver peace of mind and an ease of business to each and every customer.

Learn more about FRP, XLPE and the wide range of other tank options in our tank buying guide.

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