Question

Which packaging material provides the best protection against moisture and gases?

• A. Plastic
• B. Paper
• C. Metal
• D. Rubber

Hint:

Metal containers provide excellent barrier protection against moisture, gases, and light when compared with paper, rubber, and many plastics.

Answer 1

The Correct Option is C

Concept:
Pharmaceutical packaging protects the product from environmental factors such as:
• Moisture
• Oxygen
• Light
• Microbial contamination
• Mechanical damage

Step 1: Requirement of the question.
The question asks for the material that gives the best protection against moisture and gases. Therefore, the material should act as a very strong barrier.

Step 2: Comparing the options.
Paper is porous and does not provide strong protection against moisture or gases.
Plastic can provide protection, but many plastics allow some permeation of gases and moisture.
Rubber is flexible but may allow permeation and is usually used as closures or stoppers.
Metal provides excellent barrier properties against moisture, gases, light, and external contamination.

Step 3: Why metal is best.
Metal containers such as aluminium tubes or tins are impermeable to gases and moisture when properly sealed. This makes them highly suitable for products requiring strong environmental protection.

Step 4: Final answer.
Thus, the best packaging material among the given options is Metal. \[ \boxed{\text{Metal}} \]