What characteristic defines an approved closed container?

An approved closed container is defined by its ability to prevent any escape of vapor or liquid, which is essential for ensuring safety in handling hazardous materials. This characteristic is critical for minimizing the risks of exposure to harmful substances and preventing potential spills that could harm the environment or cause accidents.

Closed containers are specifically designed to contain substances securely, and they include features such as tight-fitting lids, seals, or other mechanisms that effectively prevent leaks. This design is particularly important in industries where chemicals or volatile substances are stored or transported, as it helps to maintain safety standards and comply with regulatory requirements.

While transparency, materials, and reusability may be relevant factors in selecting a container for certain applications, they do not define the approval status of a closed container. The primary aspect to focus on is the container's ability to securely contain its contents without allowing vapor or liquid to escape, which is vital for safety and compliance with OSHA regulations in occupational safety and health standards.