Differences Between Physical and Chemical Sunscreens
Jul 15, 2021
Source: Cainiu Health
Dr. Liu Wan
Introduction
Sunscreen products primarily work through two mechanisms: physical (mineral) and chemical sun protection, which differ in their active ingredients. Physical sunscreens form a protective film on the skin’s surface that reflects ultraviolet (UV) rays. Their advantages include simple, stable, and gentle formulations. Chemical sunscreens, by contrast, absorb harmful UV radiation within the skin. However, they are less photostable, potentially irritating, and more likely to cause allergic reactions.
Sunscreen is undoubtedly familiar to many women. Based on the underlying mechanism of sun protection, sunscreens are generally categorized into two types: physical (mineral) and chemical. Due to fundamental differences in their mechanisms of action, physical and chemical sunscreens also differ in terms of indications, whether makeup removal is required, and other practical considerations. So, what exactly distinguishes physical from chemical sunscreen? Below, we address this question.
Differences Between Physical and Chemical Sunscreen
Sunscreen products operate primarily via two distinct mechanisms—physical (mineral) and chemical—each utilizing different active ingredients. Physical sunscreens work by forming a protective barrier on the skin’s surface that reflects and scatters ultraviolet (UV) rays. Their advantages include simple, stable, and gentle formulations, making them well-tolerated by most skin types. However, they tend to be thicker and more occlusive, often leaving a heavy, greasy residue and potentially clogging pores or triggering breakouts. Moreover, physical sunscreens typically require dedicated cleansing or makeup-removal products for thorough removal. In contrast, chemical sunscreens absorb UV radiation within the upper layers of the skin. They offer lightweight, cosmetically elegant textures with superior spreadability and skin feel. Yet, their drawbacks include relative photoinstability, potential for skin irritation, and a higher risk of allergic reactions.
Knowledge Extension: How to Choose the Right Sunscreen
1. Individuals with dry skin should opt for hydrating sunscreens, which help prevent facial dryness while simultaneously enhancing skin immunity. Such products are especially suitable for those with dry skin.
2. Those with sensitive skin must exercise greater caution when selecting sunscreen, as inappropriate use may trigger allergic reactions. Therefore, it is essential to choose fragrance-free and preservative-free formulations.
The above outlines the key differences between physical and chemical sunscreens. We hope this information proves helpful to you.
