Occlusive Film
Occlusive Film — a thin protective layer left on the skin surface by occlusive ingredients that slows the evaporation of water from the outer skin. By reducing transepidermal water loss, this film helps the skin retain moisture and supports a comfortable, protected barrier.
Key points
- Common occlusive agents include petrolatum, mineral oil, beeswax, and certain silicones.
- The film works mainly by physically limiting water loss rather than adding water to the skin.
- Occlusives are often layered over humectants to help seal in the water those ingredients attract.
- Petrolatum is frequently cited as one of the most effective single occlusive ingredients for reducing water loss.
Frequently asked
Do occlusives moisturize on their own?
They mainly prevent water from leaving the skin rather than supplying moisture, so they work best paired with water or humectant ingredients underneath.
Will an occlusive film clog pores?
Some heavier occlusives may feel greasy, but many, including petrolatum, are widely considered non-comedogenic, though individual responses can vary.
Related topics
This is a foundational entry in the SYNC Skin Encyclopedia and is expanded over time. Educational information only — not medical advice.
