What Material Is a BARR Plastics Custom Tank Made From?

A plain-language guide to the thermoplastics used in custom-fabricated industrial tanks - and how to choose the right one for your application.

Why Material Selection Matters in Custom Tank Fabrication

A custom plastic tank is only as good as the material it is built from. The thermoplastic chosen for a given application directly determines how the tank performs over its service life: whether it holds up to the chemicals it contacts, how it handles temperature extremes, how easy it is to weld and fabricate, and how much maintenance it will require over decades of use.

At BARR Plastics, every custom-fabricated tank starts with a material conversation. The fluid being stored, the operating temperature, the installation environment, the regulatory requirements, and the budget all influence which thermoplastic is the right fit. There is no single universal answer - each material in our lineup serves a specific range of applications where its properties give it a clear advantage.

This article walks through the thermoplastics BARR works with, explains what each one is, and describes the kinds of applications where it is typically the best choice.

The Thermoplastics BARR Fabricates With

BARR custom tank fabrication is based on weldable thermoplastic sheet and plate. These are solid, homogeneous plastic materials that can be cut to shape and joined by thermal welding - a process that fuses the material at a molecular level to create joints as strong as the parent sheet. All materials listed here are weldable, chemically inert to a broad range of industrial fluids, and proven in demanding service environments.

HDPE - High-Density Polyethylene

HDPE is the most widely used thermoplastic in custom industrial tank fabrication. It combines strong chemical resistance, excellent impact toughness, good UV stability, and low cost into a material that performs reliably across an enormous range of applications. HDPE is resistant to most acids, bases, salts, and aqueous solutions, and it is approved for contact with potable water and many food-grade fluids.

In the context of stormwater management, rainwater harvesting, water storage, and chemical containment, HDPE is typically the default starting point. It welds cleanly using extrusion and hot gas welding, machines easily with standard tooling, and is available in a wide range of sheet thicknesses and plate sizes.

HDPE is also used in sandwich panel form - Paneltim Multipower panels, for example, are available in an HDPE formulation - where the cellular internal structure gives the material exceptional stiffness-to-weight ratio for large-panel tank walls.

• Chemical resistance: excellent across acids, bases, salts, and water
• Temperature range: continuous service to approximately 60°C
• Impact resistance: outstanding - tough at low temperatures
• Weldability: excellent - preferred material for large welded assemblies
• Typical applications: water storage, stormwater, chemical secondary containment, rainwater harvesting, wash bays
  

PP Homopolymer - Polypropylene Homopolymer

Polypropylene homopolymer offers higher heat resistance than HDPE and is the preferred choice when operating temperatures exceed what HDPE can reliably handle. PP Homo maintains structural integrity at continuous service temperatures up to approximately 100°C, making it suitable for hot process fluids, heated wash water, and chemical storage applications where elevated temperatures are involved.

PP Homo also has excellent chemical resistance, particularly to concentrated acids, oxidizing chemicals, and a wide range of organic solvents. It is commonly used in electroplating, chemical processing, and industrial wastewater treatment applications where both chemical aggression and heat are present.

The trade-off relative to HDPE is that PP Homo is more brittle at low temperatures and has lower impact resistance. For applications in unheated outdoor environments or where mechanical impact is a concern, Co-PP is typically the better choice.

• Chemical resistance: excellent - strong performance against concentrated acids and oxidizers
• Temperature range: continuous service to approximately 100°C
• Impact resistance: good at ambient temperatures; reduced below 0°C
• Weldability: excellent
• Typical applications: chemical process tanks, plating tanks, hot wash systems, acid storage
  

Co-PP - Polypropylene Copolymer

Copolymer polypropylene is a modified version of PP that incorporates ethylene units into the polymer chain, improving toughness and impact resistance without significantly sacrificing the heat and chemical resistance that makes polypropylene valuable. Co-PP is the standard material for Paneltim sandwich panels (the Multipower series is available in PP Copo), where its combination of structural stiffness, weld compatibility, and toughness makes it ideal for large panel-based tank construction.

Co-PP is the right choice when a project needs polypropylene-level heat and chemical resistance but will also be exposed to mechanical loading, vibration, or temperature cycling that would stress a homopolymer structure. For most custom tank applications where polypropylene is specified, Co-PP is the preferred grade.

• Chemical resistance: excellent - equivalent to PP Homo
• Temperature range: continuous service to approximately 105°C
• Impact resistance: very good - significantly better than PP Homo at low temperatures
  
• Weldability: excellent - compatible with PP Homo and PE fillers
• Typical applications: sandwich panel tanks, chemical storage, process vessels, food-grade applications
  

PVC - Polyvinyl Chloride

PVC has been used in industrial tank fabrication for decades and remains a common choice for certain chemical storage applications, particularly where the fluid being contained is more aggressive toward polyolefins than toward vinyl-based materials. PVC has excellent resistance to chlorinated compounds, many inorganic acids, and aqueous salt solutions.

Standard PVC is limited to service temperatures below approximately 60°C. It is stiffer than HDPE or PP, which can be an advantage in certain structural configurations but makes it less suitable for applications with mechanical impact or thermal cycling. PVC is also heavier per unit area than polyolefin alternatives and requires careful welding technique to achieve consistent joint quality.

• Chemical resistance: very good - particularly strong against chlorinated compounds
• Temperature range: continuous service to approximately 60°C
• Impact resistance: good at ambient temperatures; brittle when cold
• Weldability: good - requires controlled technique
• Typical applications: chemical storage, duct and fume scrubbers, electroplating tanks, municipal water treatment
  

CPVC - Chlorinated Polyvinyl Chloride

CPVC is a heat-upgraded version of PVC achieved through additional chlorination of the polymer chain. This modification raises the continuous service temperature ceiling to approximately 93°C, making CPVC suitable for hot chemical lines and vessels where standard PVC would deform or lose structural integrity.

CPVC is typically specified when PVC chemistry is required - strong resistance to oxidizing acids and chlorinated fluids - but the process temperature exceeds what standard PVC can handle. It is commonly used in chemical processing, hot water chemical lines, and industrial applications involving heated aggressive fluids.

• Chemical resistance: very good - similar profile to PVC with extended heat tolerance
• Temperature range: continuous service to approximately 93°C
• Impact resistance: moderate - more brittle than PVC
• Weldability: good
• Typical applications: hot chemical lines, chlorine handling, high-temperature chemical process vessels
  

PVDF - Polyvinylidene Fluoride

PVDF sits at the premium end of the thermoplastic spectrum. It offers exceptional chemical resistance - including to concentrated acids, halogens, and aggressive solvents that would attack HDPE, PP, or PVC - combined with service temperatures up to approximately 150°C. PVDF is also inherently UV-resistant and has strong mechanical properties across a wide temperature range.

The trade-off is cost. PVDF sheet is significantly more expensive than polyolefin or vinyl alternatives, and it requires specialized welding equipment and technique. PVDF is reserved for applications where no other thermoplastic can meet the chemical or temperature requirements - semiconductor processing, pharmaceutical production, concentrated acid handling, and high-purity fluid systems are the most common use cases.

• Chemical resistance: outstanding - resistant to halogens, strong acids, and aggressive solvents
• Temperature range: continuous service to approximately 150°C
• Impact resistance: good
• Weldability: good - requires appropriate filler rod and technique
• Typical applications: semiconductor chemical handling, pharmaceutical vessels, concentrated acid storage, high-purity systems
  

Side-by-Side Material Comparison

The table below summarizes the key performance characteristics of the thermoplastics BARR fabricates with. All values represent general guidance for typical grades; specific project requirements should be reviewed with BARR's technical team.

Note: Temperature ratings reflect continuous service in liquid contact. Short-term excursions may be higher. Chemical compatibility should always be confirmed for specific fluid combinations.

How BARR Selects the Right Material for Your Project

Material selection at BARR starts with four questions:

• What fluid is being stored or processed, and what is its concentration?
• What are the minimum and maximum operating temperatures?
• What are the structural requirements - tank size, wall loading, access loads?
• Are there regulatory, food safety, or purity requirements that govern material choice?
  

In most stormwater, rainwater harvesting, and water storage applications, HDPE is the right answer - it provides excellent performance at the lowest material cost and fabricates cleanly into custom geometries. For chemical process tanks, the choice between PP Homo, Co-PP, PVC, CPVC, and PVDF depends on the specific fluid chemistry and temperature. BARR's technical sales team works through these questions with engineers and project managers at the specification stage to confirm the right material before fabrication begins.

A Note on Fabrication Method: Welded Sheet vs. Sandwich Panel

All of the materials described above are available as solid thermoplastic sheet, which is the standard form for custom tank fabrication. For large-format flat wall sections where structural stiffness matters - such as the wall panels of a large stormwater detention tank - BARR also works with Paneltim sandwich panels, which use a cellular internal structure to deliver high bending stiffness at reduced weight compared to equivalent solid sheet.

Paneltim Multipower panels are manufactured in PP Copolymer or HDPE, which means they are fully weld-compatible with the same materials used elsewhere in a BARR fabricated tank. The choice between solid sheet and sandwich panel construction is a fabrication engineering decision based on tank size, wall span, load requirements, and installation constraints - not a material change. Both approaches use the same thermoplastic family and produce the same chemically resistant, weld-joined vessel.

Why Weldable Thermoplastics for Custom Industrial Tanks

All of BARR's custom tank fabrication relies on thermal welding - specifically extrusion welding and hot gas welding - to join thermoplastic components. This fabrication method is important to understand because it is what separates a welded plastic tank from alternatives like bolted FRP panels, concrete with liner, or steel with coating.

A properly welded thermoplastic joint fuses the base material at a molecular level. There are no gaskets, bolt patterns, sealants, or mechanical fasteners that can loosen, corrode, or fail over time. The weld is the same material as the sheet - it expands and contracts with the tank wall, flexes without cracking, and resists the same chemicals the parent material resists. For containment applications, this homogeneous construction is a fundamental advantage over mechanically assembled alternatives.

This is also why BARR does not fabricate with UHMWPE or fiberglass. UHMWPE cannot be thermally welded. Fiberglass is not a thermoplastic and requires a fundamentally different fabrication approach. The materials BARR works with are selected specifically because they can be welded into fully monolithic, leak-resistant structures.

BARR fabricates exclusively with weldable thermoplastics: HDPE, PP Homopolymer, Copolymer PP, PVC, CPVC, and PVDF. These materials are chosen because they can be thermally welded into continuous, chemically resistant structures with no mechanical joints.

Get the Right Tank, Built from the Right Material

BARR Plastics Inc. has fabricated custom thermoplastic tanks for stormwater management, chemical process, water treatment, industrial containment, and resource industry applications across Western Canada. Every project starts with a material and design conversation - we do not fabricate until the right material has been confirmed for the application.

If you are working on a project that requires a custom-fabricated plastic tank and you want to understand your material options, contact our technical sales team.