ISO tank containers come in various types to suit different types of cargo and specific transportation needs. Some of the common types of ISO tank containers include:

1. General Purpose Tanks: These are standard ISO tanks used for transporting non-hazardous liquids and gases. They are versatile and can handle a wide range of products, such as water, food-grade liquids, and certain chemicals.

2. Chemical Tanks: Chemical ISO tanks are specifically designed to transport hazardous chemicals safely. They have additional safety features, such as specialized linings or coatings, to prevent chemical reactions or corrosion.

3. Food-Grade Tanks: These tanks are used for transporting edible liquids, such as fruit juices, vegetable oils, wine, and other food-grade materials. They are constructed with materials that meet strict hygiene and food safety standards.

4. Gas Tanks: ISO tanks designed for transporting liquefied gases, such as LPG (liquefied petroleum gas) and LNG (liquefied natural gas). These tanks are built to withstand the low temperatures and high pressures associated with transporting gases in their liquid state.

5. Refrigerated Tanks: Also known as "reefer tanks," these ISO tanks are equipped with refrigeration units to maintain a specific temperature for temperature-sensitive products, such as chemicals, pharmaceuticals, or certain food items.

6. Swap Body Tanks: These tanks have a slightly different design from standard ISO tanks. They are used in Europe and have the same ISO dimensions but different corner castings that allow them to be loaded onto both trucks and trains.

7. Bitumen Tanks: Bitumen ISO tanks are designed for transporting bitumen or asphalt, commonly used in road construction and roofing materials.

8. Bulk Powder Tanks: These tanks are used to transport dry, granulated, or powdered products, such as cement, flour, or plastic pellets. They may have discharge systems for efficient unloading.

9. T-Code Tanks: These tanks are built to meet specific regulations for transporting certain hazardous materials or chemicals, such as toxic or radioactive substances.

10. Non-Pressure Tanks: ISO tanks used for transporting non-pressurized liquids that don't require temperature control or special handling.

Each type of ISO tank container is constructed with specific features to meet the requirements of the cargo being transported. These features may include specialized linings, temperature control systems, safety valves, and fittings designed for efficient loading and unloading. The choice of the ISO tank type depends on the nature of the cargo, safety considerations, and the regulations governing the transportation of the specific product.