What type of materials does a high pressure tanker typically carry?

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High-pressure tankers are specifically designed to transport liquefied flammable gases. These gases, which often require high pressures for liquefaction, include substances such as propane, butane, and various industrial gases. The design of these tankers allows them to safely contain these gases under pressure, preventing them from vaporizing and ensuring safe transport.

The other materials listed are typically handled by different types of tankers or containers. Liquid chemicals can be carried by various tanker types, but they do not necessarily require the high-pressure conditions meant for liquefied gases. Solid waste would not be transported in high-pressure tankers due to the different containment and handling needs, and compressed air is generally transported in specialized tanks that are not classified as high-pressure tankers for flammable gases. Thus, the correct focus is on the ability of high-pressure tankers to safely carry liquefied flammable gases.