How should buffer tubes be secured in a splice closure?

Securing buffer tubes in a splice closure with tie wraps allows for slight movement, which is crucial for maintaining the integrity of the fiber optic cables. This method provides enough support to keep the buffer tubes in place while also accommodating any potential thermal expansion or contraction that may occur due to temperature changes. Ensuring that there's some flexibility helps prevent stress on the fibers, reducing the risk of breakage or impairment during installation or as environmental conditions change.

The other options involve more rigid methods of securing the tubes, which could lead to strain on the fibers. For instance, using adhesive glue or soldering may create a permanent bond that does not allow for any movement, potentially causing damage over time. Crimping them tightly can also introduce stress points if there is no room for the buffer tubes to expand, making them less suitable for long-term reliability in splice closures.