Service temperature range comparison for elastomers: which rubber typically offers the widest continuous service window, roughly from −75°C up to about 275°C?

Introduction / Context:
Elastomer selection often hinges on temperature capability. Applications from cryogenic seals to high-temperature gaskets demand rubbers that retain elasticity across extreme ranges. Silicone rubber stands out for its broad usable window and resistance to heat and ozone.

Given Data / Assumptions:

• Target range: about −75°C to 275°C.
• Silicone rubbers maintain flexibility at very low temperatures and resist embrittlement at high temperatures.
• Butyl and nitrile have narrower ranges and poorer high-heat performance compared with silicone.

Concept / Approach:
The siloxane backbone in silicone rubber provides high bond energy and low glass transition temperature, enabling elasticity at sub-zero conditions and resilience at elevated temperatures. Conventional hydrocarbon rubbers soften/degrade earlier, limiting their upper service temperature.

Step-by-Step Solution:
Match the exceptional range to silicone performance.Eliminate butyl and nitrile due to narrower service windows.Select silicone rubber as correct.

Verification / Alternative check:
Datasheets commonly list silicone continuous service up to ~200–250°C with peaks higher; specialized grades can approach 275°C; low-temperature flexibility extends below −60°C.

Why Other Options Are Wrong:
Butyl and nitrile: limited by higher glass transition and poorer heat resistance.

Common Pitfalls:
Confusing “silicon” (element) with “silicone” (polymer); spelling matters in specifications.

Final Answer:
Silicone rubber