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Transporting bulk liquids efficiently and cost-effectively is a major concern for businesses in industries like chemicals, petroleum, pharmaceuticals, and cosmetics. Choosing the right shipping container is crucial, with two of the most common options being flexitanks and ISO tanks for shipping liquids. But which one is right for your business? This guide breaks down the key differences, advantages, and best use cases to help you make an informed decision.
What is a Flexitank / Flexibag Container?
A flexitank (also commonly called flexibags) is a single-use, flexible bladder that fits inside a standard 20-foot dry container, transforming it into a bulk liquid transport solution. Made from multiple layers of polyethylene, equipped with a valve, and often reinforced with an outer polypropylene layer, flexitanks are designed for non-hazardous liquid cargo.
Key Features of Flexitanks:
- Capacity: Typically holds between 16,000 to 24,000 liters.
- Best for: Non-hazardous liquids such as edible oils, fruit juices, lubricants, and liquid fertilizers.
- One-time use: Designed for single shipments, eliminating contamination risks.
- Lightweight: Reduces transportation costs due to lower tare weight.
- Easy disposal: No need for cleaning after use, but proper disposal procedures must be followed.
What is an ISO Tank Container?
An ISO tank is a reusable, stainless steel container designed to transport bulk liquids safely. Built to ISO standard specifications (International Organization for Standardization), these tanks ensure compliance with international regulations and are suitable for both hazardous and non-hazardous liquids.
Key Features of ISO Tanks:
- Capacity: Typically holds 21,000 to 26,000 liters.
- Best for: Hazardous and non-hazardous liquids like industrial chemicals, pharmaceutical ingredients, fuel, and liquid food products.
- Multi-use: Can be cleaned and reused for multiple shipments.
- Temperature control options: Some models come with heating or cooling capabilities for temperature-sensitive liquids.
- Durability: Constructed from stainless steel, ensuring product integrity and safety.
Liquids Frequently Transported in Flexitanks and ISO Tanks
When choosing between a flexitank and an ISO tank for bulk liquid transport, it is essential to consider the type of liquid being shipped and the best shipping container for the job. Both tank containers cater to different industries, and their suitability depends on the cargo’s nature, safety requirements, and transport conditions. Below is a breakdown of the most common liquids transported using each method.
Liquids Transported in Flexitanks
Flexitanks are ideal for non-hazardous liquids that do not require specialized temperature control or pressurization. Commonly transported liquids include:
- Food & Beverages: Edible oils (palm oil, olive oil, soybean oil), fruit juices, wine, and liquid sugar.
- Agricultural Products: Liquid fertilizers and agricultural oils.
- Industrial Liquids: Lubricants, latex, glycerin, and non-hazardous chemicals such as surfactants and emulsions.
- Personal Care & Household Products: Liquid detergents, fabric softeners, and cosmetic bases.
Liquids Transported in ISO Tanks
ISO tanks are designed for both hazardous and non-hazardous liquids, offering robust containment and, in some cases, temperature control. These include:
- Chemical & Industrial Liquids: Acids, solvents, resins, hydrogen peroxide, and other hazardous chemicals.
- Pharmaceutical & Medical Liquids: Bulk pharmaceutical ingredients and medical-grade solvents.
- Fuel & Energy Products: Diesel, biofuels, and liquid petroleum gas (LPG).
- Food-Grade Liquids: Milk, liquid chocolate, glucose syrup, and certain food additives.
By understanding the types of liquids best suited for each transport method, businesses can optimize their logistics strategy, ensuring safe and efficient bulk liquid transportation.
Flexitank vs. ISO Tank: Key Differences to Consider for Your Shipment
| Factor | Flexitank | ISO Tank |
|---|---|---|
| Cost | Lower upfront cost, single-use | Higher initial cost but reusable |
| Handling | Requires installation and proper disposal | Requires cleaning between uses |
| Sustainability | Generates waste after use | More environmentally friendly due to reusability |
| Cargo Type | Non-hazardous liquids | Suitable for both hazardous and non-hazardous liquids |
| Temperature Control | No built-in heating/cooling | Temperature control options available |
Why Flexitanks May Cost You More for Temperature-Sensitive Liquids Shipping
While flexitanks are often seen as a cost-saving alternative to ISO tanks, companies shipping temperature-sensitive liquids should consider the hidden costs that may arise.
One of our customers recently opted for flexibags instead of ISO tanks to ship coconut oil from the Philippines to Newark during the winter months. Given that coconut oil has a melting point of around 24-26°C (75-79°F), it was no surprise that upon arrival in North America’s colder climate, the oil had completely solidified. The customer had not accounted for the fact that flexitanks lack built-in heating systems, meaning the heating time to liquefy the product was significantly longer than if it had been shipped in an ISO tank. The additional heating costs, delays, and logistical challenges completely negated the initial freight savings.
Had we been involved in the shipping process from the origin point, this could have been avoided altogether. Our team would have guided the customer on the best transport method, ensuring that their coconut oil arrived in a more manageable state, reducing delays and additional costs.
Pro Tip: If your bulk liquid cargo requires temperature control or reheating, an ISO tank may be the more cost-effective solution in the long run. Additionally, consulting with experienced logistics experts before shipping can help prevent costly mistakes.
When to Use a Flexitank? Top Advantages
Opt for a flexitank if:
- You are transporting non-hazardous liquids such as vegetable oils, wine, or liquid detergents.
- You want a cost-effective option for one-way shipments.
- You need a lightweight, low-maintenance transport solution.
- You aim to eliminate contamination risks by using a single-use system.
When to Use an ISO Tank? Top Advantages
An ISO tank is the better choice if:
- You are shipping hazardous materials such as industrial chemicals or fuels.
- You need a reusable, long-term solution for bulk liquid transport.
- Your cargo requires temperature control.
- You prioritize sustainability and want to reduce single-use packaging waste.
Making the Right Container Choice for Bulk Liquid Transport
Both flexitanks and ISO tanks offer unique advantages, and the right option depends on your cargo type, budget, and logistical needs. Whether you’re looking for a cost-effective, single-use solution (flexitank) or a durable, multi-use option (ISO tank), LAC can help you choose the best transport method for your business.
Need assistance in shipping bulk liquids? Contact Latin American Cargo today to explore your best logistics solution!
