What should be ensured about blocking material used during support operations?

Blocking material used during support operations is crucial for ensuring the safety and stability of the load being supported. The primary purpose of blocking material is to provide a firm and stable foundation that can adequately support the weight and prevent any shifting or collapse of the load. By ensuring that blocking material is placed correctly to protect equipment integrity, operators minimize the risk of accidents related to equipment failure or instability. This correct placement helps distribute the load evenly and ensures that the blocking can withstand the forces exerted on it during operations.

In this context, the other options do not accurately reflect the essential requirements of blocking material. Lightweight material may not provide sufficient strength to support heavy loads. While plastic could be an option in certain applications, it is not inherently the best choice for blocking, as it may not possess the necessary strength and durability. Lastly, while temporary blocks can sometimes be used, the primary focus should always be on the structural integrity and suitability of the blocking material used in support operations, rather than the temporary nature of the blocks.