Epoxy type products have traditionally been used for coating bunded areas due to their high adhesion to concrete and chemical resistance. However, epoxies have a major disadvantage when used as a bunded area or secondary containment liners — they have no elongation and are expected to crack over time due to daily expansion and contraction of large sections of substrate. Other types of membranes such as acrylics and bituminous membranes have also been used as bund walls, but they lack flexibility and over time become brittle and crack.
Tufflon is a new generation of polyurea bund wall coating material with all the benefits of epoxies — high adhesion to the substrate and excellent resistance to chemicals and hydrocarbons — but with the extra advantage of being highly and permanently elastomeric. With elongation greater than 400% and excellent puncture resistance, the membrane moves with cyclical changes in the concrete substrate and won’t crack or peel.
The Environmental Protection Agency (EPA) suggests that all chemical containment areas (or bunds) must be large enough to hold at least 110% of the contents of a tank. Any contained liquid other than rainwater should have a bunded area to prevent contamination into the environment. These applications are found in mining, civil, construction and commercial industries and require highly elastomeric secondary containment liners, like Tufflon® and Elaston® products. Features of LiquiMix bund wall, chemical storage facility and secondary containment system products include:
Chemical bunding is a critical aspect of handling hazardous materials in various industries. Liquimix specialises in providing top-tier bunding for chemicals, ensuring a safe and secure environment. Our solutions are designed to prevent contamination of liquids into the surrounding environment, making them ideal for secondary containment needs. Specifically for chemical storage bunds, Liquimix offers robust solutions that effectively contain hazardous chemicals, safeguarding against spills and leaks. These bunds are essential for protecting both the immediate environment and complying with safety regulations, making them a crucial component in managing and storing chemicals safely.
Tufflon-P90FR, a new-generation fire-retardant polyurea material, excels in the field of chemical bund liners and is particularly effective as a fuel bund liner, offering superior protection and durability. While traditional epoxy products have high adhesion to concrete and chemical resistance, they lack flexibility.
Chemical bunding extends beyond mere containment. It is essential in areas such as sewerage and wastewater treatment plants, fuel storage, and mining chemical containment areas. Our bunding solutions are also ideal for chlorine or cleaning agent bunds and caustic bunds, providing robust protection against harsh chemicals.
Liquimix is at the forefront of developing advanced polyurea products. Our chemical bunding solutions, including the Tufflon-P90 and Elaston series, exemplify our commitment to innovation and quality. We offer tailored solutions to meet the specific needs of various industries.
In addition to chemical bunding, Liquimix offers a range of related products and services. These include water tank liners and trafficable waterproof membranes, both of which are integral to maintaining safe and functional industrial environments. Our comprehensive range of solutions is designed to offer reliability and performance, ensuring that your operations are secure and compliant with regulatory standards.
Liquimix’s chemical bunding solutions, highlighted by our Tufflon-P90 and Elaston products, provide robust and reliable containment for hazardous chemicals. Our solutions are designed to meet stringent regulatory standards, offering flexibility, durability, and ease of application. Choose Liquimix for comprehensive chemical bunding and secondary containment solutions, ensuring safety and environmental protection in your operations.
An excerpt from the Gladstone City Council in Queensland gives the following suggestions regarding bunding requirements:
“A bund is an embankment or wall of brick, stone, concrete or other impervious material, which may form part or the entire perimeter of a compound and provides a barrier to retain liquid. Since the bund is the main part of a spill containment system, the whole system (or bunded area) is colloquially referred to within the industry as the ‘bund’. The bund is designed to contain spillages and leak from liquids used, stored or processed above ground, and to facilitate clean up operations. As well as being used to prevent pollution of the receiving environment, bunds are also used for fire protection, product recovery and process isolation.”
Source – http://www.gladstone.qld.gov.au/
Chemical bunding refers to protective barriers or containment systems designed to prevent hazardous liquid spills from contaminating the environment. Secondary containment provides backup protection if primary storage tanks or containers fail. Regulations typically require bunding for chemicals to hold at least 110% of the largest container’s volume. Chemical bund liners create impermeable surfaces, preventing leaks into soil or groundwater, essential for fuel storage, chemical processing, and wastewater treatment facilities.
Chemical bund liners are typically constructed from polyurea, epoxy, polyurethane, or fibreglass materials. Modern polyurea-based bunding for chemicals provides superior flexibility, with over 400% elongation, preventing cracking due to substrate movement. Traditional epoxy chemical bund liners provide excellent chemical resistance but lack flexibility. Fuel bund liner applications often specify polyurea or polyurethane due to their resistance to hydrocarbons, rapid cure times, and permanent elasticity, making them ideal for secondary containment in demanding industrial environments.
Primary containment refers to the actual storage tank or vessel holding hazardous materials, while secondary containment provides a backup barrier through chemical bunding systems. If primary containment fails through leaks, ruptures, or spills, chemical bund liners capture and contain the liquid. Bunding for chemicals acts as the last line of defence, preventing environmental contamination. Properly designed secondary containment, combined with quality fuel bund liner protection, ensures regulatory compliance and environmental safety.
Environmental regulations mandate secondary containment capacity based on stored volumes. Single-container chemical bunding must hold at least 110% of the container’s capacity. When multiple tanks share a bund, it must contain either 110% of the largest tank or 25% of total volume, whichever is greater. These requirements ensure chemical bund liners and fuel bund liner systems provide adequate protection during catastrophic failures, with additional freeboard for precipitation accumulation.
Modern polyurea-based chemical bund liners accommodate daily thermal cycling due to their permanent elasticity, which exceeds 400% elongation. Unlike rigid epoxy systems that crack due to substrate movement, flexible bunding for chemicals stretches and contracts without losing its integrity. This makes polyurea fuel bund liner systems ideal for secondary containment in temperature-variable environments.
Installation timeframes for chemical bunding vary by system type and project scale. Spray-applied polyurea chemical bund liners cure rapidly, often within hours, allowing quick return to service compared to traditional systems. Fast-cure fuel bund liner applications minimise operational downtime for secondary containment upgrades. Epoxy-based bunding for chemicals typically requires 24–48 hours curing. Professional assessment determines optimal chemical bund liners and application methods for specific secondary containment requirements, balancing cure speed with chemical compatibility.
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