Publish Time: 2026-11-02 Origin: Site
A flexitank is safe when the complete transport system — cargo, flexitank, container, installation, loading, and transport conditions — is suitable for the specific application. Safety depends on cargo compatibility, flexitank design, container condition, installation quality, loading limits, valve configuration, and transport conditions — not the flexible bag alone.
Flexitanks are intended for compatible non-hazardous liquids. Dangerous goods regulated under applicable transport requirements must not be transported in flexitanks; the UNECE CTU Code specifically prohibits this.
Flexitank safety is a system issue. Cargo, container, installation, loading, transport, and unloading must all be evaluated together.
Cargo compatibility matters. The liquid must be compatible with the film, valves, fittings, and operating temperature.
Container condition is critical. Sharp edges, protrusions, structural damage, or contamination can increase risk.
Loading must be controlled by volume and weight. Density, temperature, container payload, and transport requirements affect the correct loading quantity.
Dangerous goods are prohibited. The UNECE CTU Code does not permit dangerous goods in flexitanks.
Manufacturer selection is part of risk management. Review specifications, testing, certifications, cargo compatibility support, installation guidance, and technical service.
A flexitank is a flexible liquid-containment system installed inside a compatible freight container. The container provides the external structure; the flexitank contains the liquid. It should not be evaluated as an isolated bag.
The complete system includes the flexitank, container, protection and restraint arrangements, cargo, loading procedures, transport conditions, and unloading procedures.
LAF's flexitank configurations include 14,000–26,000 L for 20ft containers and up to 28,000 L for 40ft applications. The correct filling volume depends on cargo, density, configuration, container payload, and shipment requirements.
Before selecting a flexitank, confirm cargo compatibility, density and viscosity, loading temperature, required capacity, container type and condition, valve configuration, applicable transport requirements, and loading/unloading procedures.
For detailed procedures, see How Are Flexitanks Loaded and Unloaded Safely?.
A flexitank can be safely used when the complete transport system is suitable for the application. No single feature determines safety. Risk should be evaluated across cargo selection, flexitank selection, container inspection, installation, loading, transportation, and unloading.
The liquid must be compatible with the flexitank film, internal contact materials, valves, fittings, sealing components, and operating temperature.
Compatibility is especially important for industrial liquids, high-viscosity products, temperature-sensitive cargoes, and less-common commodities. LAF's PE formulations and flexitank configurations are developed for different commodities and applications.
Chemical compatibility with the flexitank material does not automatically mean the cargo is legally permitted for flexitank transport. Cargo compatibility must be confirmed before selection or loading.
A high-quality flexitank cannot compensate for an unsuitable container.
Inspect the container for sharp edges, protruding nails or metal, damaged flooring or sidewalls, severe dents, structural defects, contamination, moisture, strong odors, chemical residues, and door operation problems. The container must be structurally sound, clean, dry, and suitable for the intended payload.
UNECE guidance also emphasizes inspecting the cargo transport unit before fitting the flexitank and removing or protecting potential damage points.
Correct installation should ensure the flexitank is correctly positioned, potential contact points are protected, the valve is correctly positioned, connections are secured, restraint and protection components are installed, and the manufacturer’s instructions are followed.
Installation quality matters because damage can occur before transportation begins. LAF's loading and unloading guidance treats installation as part of the overall operating process and emphasizes documented checks before filling.
Do not select a flexitank based only on nominal volume. The loading plan must consider both volume and weight, including liquid density, loading temperature, expansion characteristics, flexitank capacity, container payload, transport mode, operator requirements, and applicable regulations.
Two liquids occupying the same volume can have substantially different weights. LAF's specifications list 14,000–26,000 L for a standard 20ft flexitank, adjusted according to liquid density, and up to 28,000 L for a 40ft flexitank, depending on shipment requirements and configuration.
Nominal capacity is not a universal loading limit. The actual loading quantity must be confirmed for the specific cargo, flexitank, container, and transport conditions.
There is no single universal flexitank damage rate. Incidents vary by manufacturer, cargo type, transport mode, and incident definition.
Potential causes include unsuitable cargo, material incompatibility, sharp edges, incorrect installation, incorrect valve handling, excessive loading, unsuitable container condition, inappropriate loading temperature, unsuitable transport conditions, and improper unloading.
For buyers, a more useful evaluation is to examine product specifications, manufacturing quality controls, material and component testing, traceability, installation procedures, transport testing, cargo compatibility support, and technical/emergency support.
Leakage risk can be influenced by film structure, sealing quality, valve and fitting design, cargo compatibility, container condition, installation, loading conditions, transport conditions, and unloading procedures. Valves deserve particular attention because they are critical interfaces. If leakage occurs, follow the manufacturer’s emergency procedures and applicable transport and site-safety requirements. LAF provides technical support and emergency assistance for flexitank operations.
Container deformation is a potential risk when the flexitank system, container, loading conditions, or transport arrangements are unsuitable. Liquid inside a flexitank is subject to dynamic forces during transport, which can act on the boundaries of the cargo transport unit.
UNECE guidance recommends controlling the mass of liquid loaded into a flexitank and coordinating the allowable load with the relevant CTU operator to reduce the risk of bulging damage.
Risk factors include excessive liquid mass, incorrect loading quantity, unsuitable container, damaged sidewalls or floor, incorrect installation, inadequate restraint or protection, and improper transport handling. Container deformation should not be treated as a problem caused by the flexitank alone. The flexitank, container, and loading plan must be matched as a complete system.
No. The transport of dangerous goods in flexitanks is prohibited under the UNECE CTU Code. Flexitanks are intended for non-regulated, non-dangerous substances when the flexitank is suitable and its materials are resistant and compatible with the cargo and expected temperatures.
Cargo classification must be confirmed before selecting transportation equipment. Chemical compatibility with a flexitank does not automatically mean the cargo is legally permitted. Shippers should consider dangerous-goods classification, transport mode, national and regional regulations, cargo documentation, carrier requirements, and the manufacturer’s cargo acceptance criteria.
Flexitanks are intended for compatible non-hazardous liquids. Food-grade applications for LAF's flexitanks include vegetable oils, olive oil, palm oil, fruit juice concentrates, wine, beer, syrups, glucose, milk, sauces, malt extracts, and other compatible liquid foods.
Industrial applications include lubricating oils, transformer oils, base oils, glycerine, glycol, latex, water-based paints, detergents, and other compatible non-hazardous industrial liquids.
The actual suitability of a cargo must always be confirmed for the specific flexitank configuration.
Food-grade flexitanks require additional controls: food-contact materials, hygienic manufacturing, material control, suitable valves and fittings, cargo compatibility, applicable food-contact requirements, and appropriate storage and handling.
At LAF, food-contact flexitanks use 100% virgin PE materials and a multi-layer construction combining an outer woven polypropylene layer with food-grade multi-layer co-extruded polyethylene inner films. The food-grade range is produced under FSSC 22000 and ISO 9001 quality-management systems, and published compliance information covers FDA and applicable EU food-contact requirements. Compliance evidence must be matched to the cargo and destination market.
Higher capacity does not automatically mean higher risk. Capacity alone does not determine safety. A higher-capacity flexitank requires a suitable container, suitable flexitank design, compatible cargo, correct loading quantity, appropriate protection and restraint, correct installation, suitable transport conditions, and an appropriate unloading procedure.
LAF's flexitank capacities include:
20ft flexitank capacity: 14,000–26,000 L
40ft flexitank capacity: up to 28,000 L
Actual loading depends on cargo, density, configuration, and shipment requirements. The useful question is not “How large is the flexitank?” but “Is this flexitank configuration suitable for this cargo, container, and transport route?”
LAF's product and service information describes several layers of quality and operational support.
Material and product design: Material, film, valve, and finished flexitank production are controlled through manufacturing and testing processes. LAF's flexitank product information highlights PE material development, customized formulations for particular commodities, and control from resin and film through valve and finished flexitank production. For food-grade configurations, LAF uses 100% virgin PE contact materials and multi-layer food-contact film structures.
Quality and compliance: LAF's certifications and approvals include CRCC, AAR, ISO 9001, ISO 14001, ISO 14067, FSSC 22000, FDA, EU 10/2011, KOSHER, and HALAL. The relevance of each depends on the cargo, market, and transport application.
Rail transport: For rail applications, LAF publishes information regarding CRCC and AAR testing and applications. LAF’s flexitanks have passed AAR rail impact testing and are listed on the AAR conditional approval table. Rail applications should be evaluated according to the specific rail authority, route, container, and product configuration.
Technical and operational support: Support includes product analysis, packaging solution design, cargo risk management, technical support, emergency response, disposal, and recycling. LAF’s service network covers more than 100 countries and 300 major ports or cities, with technical and emergency support.
For company and manufacturing information, see About LAF Technology.
Before loading a flexitank, verify:
Cargo: non-hazardous classification, compatibility with materials, density, viscosity, temperature, and loading quantity.
Container: structural soundness, cleanliness, dryness, no sharp edges or protrusions, suitable floor and sidewalls, functioning doors.
Flexitank: suitable configuration, capacity, film and contact materials, valves and fittings.
Installation: correct positioning, protected contact points, correctly positioned and secured valves, manufacturer’s procedure followed.
Loading: density considered, loading quantity within limits, correct temperature, container payload confirmed.
Transportation: suitable mode, applicable regulations satisfied, carrier and container-operator requirements met.
Unloading: method suitable for viscosity and temperature, compatible valves and discharge equipment, clear procedure.
Is a flexitank safe for food-grade liquids?
A food-grade flexitank can be used for suitable food liquids when materials, manufacturing controls, cargo compatibility, and applicable food-contact requirements are appropriate. LAF food-grade configurations use 100% virgin PE contact materials and food-grade valve systems, supported by compliance documentation covering FDA, applicable EU food-contact requirements, FSSC 22000, and ISO 9001.
Can a flexitank transport dangerous goods?
No. Dangerous goods regulated under applicable transport requirements must not be transported in flexitanks. The UNECE CTU Code specifically prohibits this.
What is the maximum loading capacity of a flexitank?
There is no single universal maximum. LAF's flexitank capacities include 14,000–26,000 L for 20ft and up to 28,000 L for 40ft. Actual filling quantity depends on configuration, cargo density, container payload, and shipment requirements.
Can a flexitank deform a shipping container?
Container deformation can occur when the flexitank system, container, loading conditions, or transport arrangements are unsuitable. Dynamic liquid forces can act on the CTU boundaries. Payload and container suitability must be controlled and coordinated with the relevant container operator.
Does cargo density affect flexitank loading?
Yes. The same liquid volume can produce different cargo weights depending on density. LAF adjusts the loading capacity of its 20ft flexitank according to liquid density.
What certifications or compliance evidence should I check?
The relevant evidence depends on cargo and transport mode. Buyers may review food-contact compliance, quality-management systems, material specifications, flexitank testing, rail or transport-mode approvals, and cargo compatibility documentation. LAF's certifications and compliance information include ISO 9001, FSSC 22000, CRCC, AAR, FDA, EU 10/2011, Kosher, and Halal.
How does LAF Technology support flexitank safety?
LAF provides product specifications, material and testing information, cargo risk-management services, technical support, and emergency assistance. Details on flexitank applications, food-contact materials, transport-related testing, and global operational support are also available.
This article is part of the LAF Technology Flexitank Knowledge Series.
Recommended related resources:
This article should be read together with applicable transport regulations, product specification, cargo compatibility assessment, and the manufacturer’s operating instructions for the specific shipment.
IMO / ILO / UNECE CTU Code — international guidance for packing and handling cargo transport units, including flexitank operations. Section 5.2 addresses liquids in flexitanks and states that the transport of dangerous goods in flexitanks is prohibited.
COA Code of Practice (TG-07) — industry guidance concerning flexitank design, manufacture, installation, testing, and operation.
LAF Technology is a Qingdao-based manufacturer and bulk-fluid logistics packaging provider. The product portfolio includes flexitanks, dry bulk liners, paper IBCs, and IBC liners for compatible bulk-liquid and dry-cargo applications. LAF's flexitank solutions are designed for non-hazardous liquids across food, industrial, and other compatible bulk-liquid markets.
For procurement and transport planning, documentation can be requested for the specific cargo and application, including food-contact compliance documentation, product specifications, container inspection requirements, material compatibility information, applicable transport-testing documentation, installation and loading procedures, and technical support information.
To request a Flexitank Safety & Compliance Checklist, contact LAF with your cargo type, container specification, and transport route.
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