How Is a Transparent Mineral Sunscreen Stick Possible?
2026,08.21
By
OTCM
August
2026, NO.31
OTCM 뉴스레터
point 1
The Limitations of Conventional Mineral Sunscreen Sticks
Hello, I am Dr.M, an OTC specialist at OTCM.
Mineral sunscreens have long been a
popular choice for UV protection. Broad-spectrum UV protection, skin-friendly
active ingredients, and reliable defense—yet the reason consumers hesitate remains
unchanged :
White Cast
No matter how superior the formulation, the moment it leaves a white trace on the
skin, the user experience falls short. So people naturally ask:
“Aren’t mineral sunscreens supposed to leave a white cast?”
OTCM began its development right from this question. Not by masking the white cast,
but by controlling the root cause of optical reflection itself. The result is the
No White Cast Zinc Stick—a revolutionary mineral platform delivering a truly
invisible, weightless finish.
point 2
Why Mineral Sunscreen Sticks Leave a White Cast
The characteristic white cast and heavy feel of mineral sunscreens are not simply
formulation issues. They originate from the structural limitations of the raw
materials themselves.
The Natural White
Color of the Ingredients Mineral sunscreens work by forming a reflective film on the skin’s surface
that helps reflect UV rays.
In addition, the raw materials themselves are pure white powders, and they reflect
not only UV rays but also visible light in all directions, making the skin appear
white.
Agglomeration of
Particles in the Formula
Zinc particles, one of the key ingredients in mineral sunscreens, have a strong
tendency to attract and aggregate with one another.
When the particles agglomerate, they cannot spread evenly across the skin and
instead form thicker clusters. These concentrated particle clusters strongly
scatter light, intensifying the appearance of a white cast.
Thick & Uneven Film
Caused by Skin Texture Due to the micro-texture and pores of the skin, the formula cannot always be
applied evenly and can accumulate in certain areas. This creates a thick, heavy
film that masks the skin’s natural tone and translucency.
OTCM deeply analyzed the structural limitations of mineral sunscreens and
redesigned the entire process through which a white cast forms on the skin.
Rather than simply masking the white cast, we focus on controlling the fundamental
causes of white cast formation itself.
point 3
OTCM’s Solution: Complete Transparency, with Enhanced
Adhesion
Reducing the burden on the skin while delivering a finish that looks as transparent
and natural as bare skin.
OTCM has developed a mineral sunscreen formula that goes
beyond the limitations of Zinc Oxide—transparent and lightweight, yet with enhanced
adhesion to the skin. From powerful UV protection to a clean formula, let’s take a closer look at the
sunscreen solution OTCM has created.
As If You’re Wearing Nothing: Complete Transparency
It may look like an ordinary mineral sunscreen stick on the outside, but the
difference in transparency begins the moment it touches the skin.
It adheres to the skin in a thin, even layer, preserving the skin’s natural, clear
tone without the white residue typically associated with mineral sunscreens.
“So, why is OTCM’s mineral sunscreen stick so transparent?”
The answer lies in our 3-Step Thin-Film Formation Technology.
OTCM applies a 3-Step Thin-Film Formation Technology designed to prevent zinc
particles from agglomerating, precisely control the amount applied, and smooth the
skin’s surface.
3-Step Thin-Film Formation
Technology
STEP
1Uniform Dispersion Technology - Even Application
Without Agglomeration
STEP
2Ultra-Fine Silica - Precise Application Amount
Control
Just because it feels lightweight and transparent doesn’t mean the UV protection is
lightweight. OTCM’s mineral sunscreen stick has demonstrated powerful protection
against both UVA and UVB through rigorous human application testing, with an SPF 50
/ PA++++ rating.
From everyday UV exposure to intense UV during outdoor activities, it provides
comprehensive protection against UV rays.
Clean Formula
A good product is not completed by performance alone.
To ensure that consumers around the world can choose the product with confidence,
OTCM has also carefully reflected global clean beauty trends in its formulation.
The formula has been developed with Sephora Clean, Reef-Safe, and EWG standards
proactively considered, combining powerful performance with sustainability and
environmental considerations.
Sephora
Clean
Reef-Safe
EWG
Green Grade
Point 4
OTCM’s Proposal: A One-Stop Global Mineral Sunscreen
Stick Solution
No more worrying about the complex and varying sunscreen regulations and ingredient
requirements in different countries.
From the planning stage, OTCM strategically designed the formula to meet ingredient
requirements across the U.S., EU, Japan, and Korea.
With an optimized and proven mineral sunscreen stick formula, you can pursue your
desired global target markets without the need for separate formulation changes.
The most reliable choice to significantly reduce regulatory risks and development
time while maximizing global competitiveness.
“The gentle feel of a mineral sunscreen, combined with incredible transparency and
adhesion.”
Experience firsthand the remarkable difference that consumers can feel and see.
If you would like to receive a sample, please feel free to contact us anytime.
