Thermocole (expanded polystyrene, EPS): identify the application for which EPS is NOT suitable.

Introduction / Context:
Expanded polystyrene (EPS, Thermocole) is a lightweight, closed-cell foam with excellent insulation at low to moderate temperatures. Its thermal stability, however, is limited compared to refractory materials.

Given Data / Assumptions:

• EPS softens well below furnace temperatures.
• EPS is widely used for packaging and building insulation.

Concept / Approach:
Match material capability to service temperature. Furnaces require refractory or high-temperature insulations (e.g., ceramic fiber). EPS is combustible and thermally unstable at elevated temperatures, making it unsuitable for furnaces.

Step-by-Step Solution:
Evaluate each option against EPS temperature limits.Eliminate low-temperature and acoustic/packaging uses (valid).Select furnace insulation as unsuitable.

Final Answer:
High-temperature furnace insulation