Comprehensive Guide: Types of Plastic in Water Tanks

Explore the comprehensive guide to the different types of plastic used in water storage tanks, including HDPE, PP, PVC, LLDPE, and LDPE. Understand their characteristics, benefits, and considerations to make an informed choice when selecting a water storage tank.


Oswal Hi Tech Pvt Ltd

6/21/20233 min read


Water storage tanks made from plastic are a popular choice due to their versatility, durability, and affordability. In this comprehensive guide, we will delve into the various types of plastic used in water storage tanks, including high-density polyethylene (HDPE), polypropylene (PP), polyvinyl chloride (PVC), linear low-density polyethylene (LLDPE), and low-density polyethylene (LDPE). By understanding the characteristics and benefits of each type, you can make an informed decision when choosing a water storage tank that meets your specific needs.

  1. High-Density Polyethylene (HDPE):

    HDPE is a widely used plastic in water storage tanks due to its exceptional strength, impact resistance, and chemical resistance. HDPE tanks are known for their durability, UV resistance, and ability to withstand harsh environmental conditions. They are suitable for storing various liquids, including potable water, and are commonly used in residential, commercial, and industrial applications.

  1. Polypropylene (PP):

    Polypropylene is a versatile plastic known for its chemical resistance and durability. PP tanks offer excellent resistance to a wide range of chemicals, making them suitable for storing corrosive substances. They are lightweight, yet robust, and resistant to impact and cracking. PP tanks find applications in industrial settings such as chemical storage, wastewater treatment, and industrial process tanks.

  1. Polyvinyl Chloride (PVC):

    PVC is a cost-effective plastic used in water storage tanks. It is known for its affordability, chemical resistance, and ease of installation. PVC tanks are lightweight, durable, and offer good tensile strength. They are commonly used for smaller-scale water storage purposes, such as residential or agricultural applications. However, PVC tanks may not be suitable for storing high-temperature liquids.

  1. Linear Low-Density Polyethylene (LLDPE):

    LLDPE is a type of polyethylene known for its flexibility, toughness, and impact resistance. LLDPE tanks are lightweight, yet durable, and have excellent resistance to chemicals and environmental stress cracking. They are commonly used for water storage in agricultural, industrial, and commercial applications. LLDPE tanks are particularly suitable for outdoor installations due to their UV resistance.

  1. Low-Density Polyethylene (LDPE):

    LDPE is a flexible and lightweight plastic used in various applications, including water storage tanks. LDPE tanks offer good chemical resistance and are relatively inexpensive compared to other plastic options. However, they may not have the same level of durability and strength as HDPE or LLDPE tanks. LDPE tanks are commonly used for smaller-scale water storage needs or temporary applications.

  1. Cross-Linked Polyethylene (PEX):

    PEX is a newer type of plastic used in water storage tanks. It offers excellent strength, durability, and resistance to chemicals. PEX tanks are highly flexible and can withstand freezing temperatures without cracking. They are commonly used for applications such as hydronic heating systems or radiant floor heating, where hot water storage is required.

When selecting a water storage tank, consider factors such as the intended use, storage capacity, installation requirements, budget, and the specific characteristics of each plastic type. Ensure that the plastic used in the tank is approved for potable water storage if you plan to store drinking water. Look for tanks that comply with industry standards and regulations to ensure safety and reliability.


Understanding the different types of plastic used in water storage tanks allows you to choose the most suitable option for your specific needs. HDPE, PP, PVC, LLDPE, and LDPE are commonly used plastics, each with its unique characteristics and benefits. Consider the intended use, durability, chemical resistance, and installation requirements when selecting a water storage tank. By choosing the right plastic for your tank, you can ensure the safe and efficient storage of water for various applications.