Which type of HPD is meant for one-time use only?

Hand-formed ear plugs are designed for one-time use only because they are typically made from soft, pliable materials that are shaped to fit the user’s ear canal for immediate protection. Once they are removed, the material can lose its shape and effectiveness, making them unsuitable for future use. This characteristic defines their intended purpose as a disposable hearing protection device.

In contrast, custom-molded earplugs are created through a specific impression of the user's ear, making them reusable while providing a comfortable fit. Reusable over-the-ear muffs are specifically designed and engineered for multiple uses, offering ongoing protection with proper care. Ear canal caps also provide a protective fit but are intended for situations where full ear coverage is not required, providing more versatility and often being reusable.