Emulsifying Wax (Anionic)
Pharcos WEA
Also known as: Emulsifying Wax BP | Cetearyl Alcohol and Sodium Lauryl Sulfate
Pharcos WEA is an Anionic Emulsifying Wax designed to meet the rigorous specifications of global pharmacopeias (like BP or USP). It is rigidly defined as a mixture of Cetostearyl Alcohol (acting as the structural wax) combined with roughly 10% Sodium Lauryl Sulfate (SLS, acting as the primary anionic emulsifier). It is the backbone of the traditional 'Aqueous Cream BP', favored for decades in dermatology as a highly stable vehicle for delivering topical drugs, steroids, and heavy moisturizers to the skin.
Quick Information
- Product Line:
- Personal Care
- Category:
- Emulsifying Waxes
- Grade:
- Wax Flake
- CAS Number:
- Proprietary Blend
Key Applications
- Aqueous Creams (BP)
- Pharmaceutical Ointments
- Water-Washable Bases
- Heavy Barrier Creams
How It Works
Electrostatic stability via Sodium Lauryl Sulfate.
The massive thickening power of Cetearyl Alcohol creates the rigid wall of the cream. To keep the oil droplets suspended, the Sodium Lauryl Sulfate (SLS) molecules anchor their lipophilic tails into the oil, leaving their strongly anionic (negatively charged) sulfate heads pointing out into the water. This gives every single oil droplet a massive negative electrical charge. The droplets violently repel one another, making it physically impossible for them to collide and separate out of the emulsion.
Technical Information
Common questions about Emulsifying Wax (Anionic)
Tradition and standardization. Anionic Emulsifying Wax BP has been the official, standardized monograph in pharmacopeias for generations. Medical professionals trust its consistent drug-release profile, and changing the base in a licensed drug is a massive regulatory hurdle.
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