What characteristic should insulation material retain to be effective in high-temperature environments?

In high-temperature environments, insulation material needs to have strength as a critical characteristic. Strong insulation materials can withstand extreme temperatures without degrading, melting, or losing their structural integrity. This durability is vital in applications such as industrial boilers, steam pipes, and high-heat equipment, where insulation must endure not just temperature but also potential mechanical stress and pressure.

While flexibility can be helpful, especially for installation purposes, it does not necessarily correlate with heat resistance or longevity in high-temperature scenarios. Likewise, lightweight insulation might be advantageous for ease of handling but is not as crucial as the strength of the material in maintaining performance under high heat. Affordability, while important in some contexts, does not influence the thermal or structural performance of the insulation, making strength the most relevant characteristic for effective insulation in high-temperature environments.