Filter media for corrosive liquids\nWhich of the following is generally NOT preferred as a filter medium when handling corrosive liquids in chemical processing?

Introduction / Context:
Filter media must resist chemical attack, retain mechanical integrity, and deliver required clarity. For corrosive services—strong acids/alkalis or oxidizers—material compatibility becomes the dominant selection criterion, superseding cost in many cases.

Given Data / Assumptions:

• Corrosive liquids include strong mineral acids, strong bases, or oxidizing environments at process temperatures.
• Media are evaluated for chemical resistance and durability.

Concept / Approach:
Cotton is a natural cellulose fiber that degrades in strong acids and alkalis and can be oxidized, making it a poor choice for many corrosive services. In contrast, nylon (polyamide), glass cloth, and metallic meshes (Monel, stainless) exhibit superior resistance profiles in many corrosive conditions (selection depends on specific chemistry). PTFE felts are highly inert and a common premium option where compatibility is critical. Therefore, among the choices, cotton fabric is generally not preferred for corrosive duties.

Step-by-Step Solution:

Verification / Alternative check:
Chemical compatibility charts show rapid strength loss for cotton in strong acids/bases, while PTFE and certain metals remain serviceable.

Why Other Options Are Wrong:

• Nylon/glass/Monel/SS/PTFE have known corrosion resistance niches and are routinely used based on chemistry and temperature.

Common Pitfalls:
Ignoring temperature: some polymers soften; always cross-check actual process conditions and fluid composition.

Final Answer:
Cotton fabric