What is confusing when speaking about protecting one's skin
from the sun's dangerous UV rays is whether it's called "sunscreen"
or the term "sunblock." What one needs to know here is that both
sunscreen and sunblock are absolutely two separate products but derive their
primary benefits from differences in ingredients, mechanisms of action, and
from the kind of protection they offer. These products must be understood with
informed choice for sun protection. In the article, we will outline definitions
of sunscreen and sunblock, their benefits and drawbacks, and which one might be
more applicable to suit your needs.
Definition of Sunscreen and Sunblock
What Is Sunscreen?
Sunblock prevents damage to skin by the ultraviolet rays
from the sun. Most of the radiations are UVA and UVB rays, which most chemical
filters or active ingredients absorb and emit as heat, coming out from the
skin.
General Chemical Formulations
Chemical formulations comprise most volumes of sunscreen usage, out of which are:
- Avobenzone: It protects against UVA.
- Octisalate: Stabilizes other sunscreen ingredients.
- Octocrylene: It acts on UVB and some UVA.
- Homosalate: More effective at UVB
- Oxybenzone: This is a broad-spectrum agent though one that
has been much more infamous in its environmental effects
What is Sunblock?
Technically, sunblock is the common household term used for
physical or mineral sunscreen products that create a barrier layer on the skin to
deflect and scatter UV rays. Generally, sunblocks are composed of active
mineral ingredients that stay on the outer surface of the skin instead of being
absorbed in.
Active mineral ingredients
Active mineral ingredients of mini drug sunblocks include the
following:
Zinc Oxide It gives broad-spectrum protection against UVA
and UVB and is typically a safe product.
Titanium Dioxide It provides mostly UVB protection but does
provide a certain level of protection against UVA also.
Sunscreen vs. Sunblock
1. How it works
- Sunscreen: These chemicals absorb UV light by chemical
reactions whereby it transforms to heat and then releases it out of the skin. Therefore
sunscreen should be applied on the skin at least 15 to 30 minutes before going
out.
- Sunblock: These, as the name itself suggests, can almost be
taken to be literal in creating a physical block that reflects and disperses UV
rays away from the skin. Thus, sunblock can be effective the moment it touches
the skin.
2. Ingredients
- Sunscreen: Chemical filters, which absorb the UV. Some
people react to the chemicals, developing skin irritation and allergy.
- Sunblock: Mineral filters, which have less potential for
irritation for sensitive skin. They are applied to children and those affected
with skin diseases.
3. UV Protection Spectrum
- Sunscreen: Most sunscreens give protection on a broad
spectrum of UVA and UVB; however, not all do. Always look for the label, which
specifically claims a broad spectrum.
- Sunscreen: Typically provides broad-spectrum protection
because of the mineral-based ingredients, which reflect UVA and UVB rays very
effectively.
4. Texture and Feel
- Sunscreen: Since it is more fluid, has a lighter texture,
and absorbs very fast, it is more likely to be applied for use with daily
activities applied underneath makeup or during athletic sport activities.
- Sunblock: Typically is thicker and will give off a white
cast on the skin, which might not be desirable for some people.
View More: Sunscreen White Cast How to Deal With it
Advantages and Disadvantages of Sunscreen and Sunblock
Sunscreen
Advantages
- Lightweight and easy to apply
- Absorb quickly, and less likely to produce a visible
residue.
- Sold in sprays, lotions, and gels, with varying formulations
Disadvantages
- May contain chemical active ingredients that are irritating
to sensitive skin.
- Takes time to absorb before exposure to the sun.
- Some chemical filters carry environmental concerns,
particularly coral reefs.
Sunblock
Advantages
- Works immediately upon application
- Generally safer for sensitive skin and children.
- Mineral ingredients tend to be less likely to cause
irritation.
Disadvantages
- Thicker and may give the skin a whitish appearance.
- Needs to be reapplied more frequently if you are active and
sweating or swimming.
- Generally much more costly than chemical sunscreens.
Which Is Better: Sunscreen or Sunblock?
Ultimately, it really comes down to personal choice and
depends on your needs, type of skin, and what your skin demands. Here are some
comparison points for your selection:
Skin Sensitivity
If you are sensitive, prone to allergy reactions or have
eczema or rosacea, sunblock will be better due to having less chance of your
fragile areas getting irritated due to its mineral contents.
Daily Use vs. Water Sports
While using a thin sunscreen is more suitable for daily use,
especially under makeup, when engaging in water sports or any similar activity
that leaves you outdoors and exposed to the sun for extended periods, using a
sunblock is much better since this creates a barrier over sunburn.
Environmental Concern
If you are sensitive to environmental impact, look for
mineral sunblocks, which are largely viewed as safer to marine environments.
Make sure to check for "reef-safe" in the product label.
How to Apply Sunscreen and Sunblock Properly
Application Guidelines
- Quantity: Use 1 oz coverage over the entire body: use a
nickel-size amount over the face.
- Timing: Apply sunscreen or sunblock 15-30 minutes before
going out in the sun.
- Reapplication: Every two hours, less if swimming or
excessive sweating, but water-resistant sunscreens do last longer, not forever.
- Cover All Areas: Do not forget neglected areas, like ears,
the back of the neck, and the tops of feet.
- Check Expiration Dates: Always inspect for an expiration
date because expired products may not protect your skin effectively
Special Considerations
Children's Sunscreen
Parents are always left wondering which product is best when
it comes to protecting children from the sun. Doctors and pediatricians usually
recommend mineral sunblocks on children under six months old, and chemical
sunscreens on bigger children when mineral options are not available. Always
consult a pediatrician for recommendations based on your child's skin type or
sensitivities.
Conclusion
Knowing what the difference is between sunscreen and
sunblock is basic for proper protection against the sun. These are two products
that greatly protect your skin from UV rays destructive effects, though each
works differently on the skin with varying chemicals. Ultimately, the right
choice will depend on your skin, living style, and other needs.
Whether sunscreen or sunblock is your choice, the idea is to
do it diligently and correctly so you can put across a sun-protective regime. A
sun protection regime can become a consistent means of applying the products
diligently and exercising other means of sun safety that will drastically
reduce your chance of getting burned, damaging your skin, and developing skin
cancer. After all, healthy skin today is healthy skin tomorrow.
Please book an appointment with the best Dermatologist in Lahore, Karachi, Islamabad, and all major cities of Pakistan through InstaCare, or call our helpline at 03171777509 to find the verified doctor for your disease.