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Chemical Sunscreens
Advantages
- They bind to horny layer of skin and have longer duration of action.
- Can be incorporated in lotions, creams, gels, etc.
- Generally cause no staining.
Disadvantages
- Can cause allergy.
- All of them don’t cover the entire spectrum of UVR.
Ingredients used to screen UVB:
UVB is known as the burning wavelengths of light, and the cause of sunburns and skin cancers.
The active Ingredients which are used to screen UVB are generally- PABA (known to be a contact dermatitis allergen, and mostly avoided in current sunscreens), Octyl Methoxycinnamate, Octyl Salicylate.
Ingredients used to screen UVA:
UVA SCREENS: 260 NM to 400 NM
UVA is known to cause deeper tissue damage, wrinkle formation and skin cancer.
The following active Ingredients are normally incorporated to screen UVA- Oxybenzone, Avobenzone or Parasol 1789 and Benzophenone.
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