Types of Papers - Study Notes

Papers are essential tools in pharmacy, primarily used to wrap and dispense divided powders.
The choice of paper is crucial and depends on specific characteristics of the drug, such as:
- Moisture sensitivity
- Volatility
- Oily nature

Description:
- Plain, smooth, ordinary writing paper.
- Generally cheap and widely available.
Uses:
- Suitable for non-hygroscopic substances (substances that do not absorb moisture).
- Ideal for non-volatile and stable drugs.
Examples:
- Sodium bicarbonate
- Starch
- Simple antacid powders.
Advantages:
- Economical
- Easy to fold and label.
Disadvantages:
- Not moisture-resistant.
- Not suitable for hygroscopic or oily drugs.

Description:
- Semi-transparent paper that has been treated to resist moisture and grease.
Uses:
- Designed for hygroscopic substances (those that absorb moisture).
- Appropriate for slightly moisture-sensitive powders.
Examples:
- Ammonium chloride
- Citric acid.
Advantages:
- Provides protection from moisture.
- Better than white paper for sensitive drugs.
Disadvantages:
- More expensive than white paper.

Description:
- Paper coated with a wax layer, making it water-resistant.
Uses:
- Utilized for highly hygroscopic drugs.
- Appropriate for moisture-sensitive powders.
Examples:
- Potassium citrate
- Sodium salicylate.
Advantages:
- Good moisture protection.
- Effectively prevents dampness.
Disadvantages:
- Slightly more difficult to fold compared to white paper.
- Typically costlier than white paper.

Description:
- Smooth, glossy, and transparent paper that is resistant to air and grease.
Uses:
- Suitable for oily or greasy powders.
- Appropriate for substances that are affected by air exposure.
Examples:
- Menthol-containing powders
- Camphor mixtures.
Advantages:
- Resistant to grease, maintaining drug integrity.
- Offers an attractive appearance for packaging.
Disadvantages:
- More costly compared to white paper.
- Not completely moisture-proof, hence should be used with consideration of ambient conditions.