SQ-SE 8100 – Waterborne Polyurethane for Mascara & Eyeliner

If you have ever formulated a mascara that flakes by noon, an eyeliner that melts into dark circles by afternoon, or a foundation that turns into white streaks with sweat, you already know the culprit is rarely the pigment or the emulsifier—it is always the film former. Traditional options each carry a fatal flaw: acrylates are rigid and crack under movement; waxes soften at skin temperature and migrate; PVP absorbs moisture, turns sticky, and fails in humidity. SQ-SE 8100 (INCI: Polyurethane-35) was engineered to eliminate every one of these trade‑offs at the molecular level.

SQ-SE 8100 vs. The Old Guard

Property	Acrylates	Waxes	PVP	SQ-SE 8100
Film flexibility	Brittle – cracks on movement	Softens with heat, migrates	Absorbs water, swells	Highly flexible, bends with skin
Water resistance	Moderate, may swell	Good but melts at skin temp	Poor, becomes sticky	Excellent, hydrophobic
Oil/sweat resistance	Weak – oil penetrates	Melts with sebum	Weak – dissolves in sweat	Strong – oil & sweat proof
Easy removal	Requires harsh rubbing	Needs oil-based cleanser	Easy but smudges during wear	Gentle, standard cleanser
Skin feel	Tacky or stiff	Greasy, heavy	Sticky or dry	Non‑tacky, non‑greasy
Cold‑processable	Yes	No (requires heat)	Yes	Yes
Anti‑migration	Poor – feathers	Migrates with oil	Poor – bleeds	Excellent – locks pigment

The table makes one thing indisputable: every conventional film former forces you to accept a downside in exchange for a single advantage. SQ-SE 8100 is the only one that delivers all the benefits with none of the drawbacks—flexible yet durable, water‑repellent yet removable, comfortable yet resilient.

Mascara – No More Flakes

The unique challenge: Lashes move constantly, encounter humidity, and contact skin oils. Acrylates crack into flakes; PVP smudges in moisture; waxes melt and travel downward. Consumers hate the fallout, not the volume.

How SQ-SE 8100 solves it:

• 1.Flexibility: Its polyurethane film bends with every blink—no cracking.
• 2.Hydrophobic & Oil-Repellent: Its hydrophobic nature repels water and oil—no smudging.
• 3.Easy Removal: It releases with standard cleansers—no rubbing.
• 4.Final Result: All‑day curl and definition without the debris.

Waterproof Mascara:

Phase	Ingredient	% w/w
A	Water	q.s. to 100
A	SQ-SE 8100	15.0–25.0
A	Xanthan Gum (thickener)	0.3–0.8
B	Black Iron Oxide	8.0–12.0
B	Emulsifier	1.0–3.0
C	Preservative	0.5–1.0

Key takeaway: At 15–25% loading, SQ-SE 8100 eliminates flaking completely—replace your acrylate or PVP with it and watch complaint rates drop.

Eyeliner – No More Dark Circles from Melted Liner

The unique challenge: Eyeliner starts sharp. But by midday, the eyelids produce sebum—and that oil breaks down most film formers. The liner doesn't just fade; it melts downward, collecting right along the lower lash line. What should be a clean wing becomes a dark, smudged shadow under the eyes. It looks like you haven't slept in days. It accentuates every fine line and makes the entire eye area look older, messier, and tired. Acrylates crack and peel in chunks. Waxes soften, flow with oil, and settle into under-eye creases. PVP absorbs moisture, swells, and bleeds outward. None of them can hold a sharp line against the combination of eyelid oil and blink motion.

How SQ-SE 8100 solves it: 

• 1.Rapid Film Formation: Its MFFT of 0°C ensures rapid film formation upon application—locking the line instantly.
• 2.Inherent Oil Resistance: Once set, the polyurethane film is inherently oil‑resistant; sebum cannot soften or dissolve it.
• 3.Anti-Migration Effect: The anti‑migration chemistry holds pigment exactly where placed, preventing any downward flow into the lower lash area.
• 4.Long-Lasting Wear: Even after hours of wear, the line stays crisp and elevated—no melting, no pooling under the eyes, no dark circles that aren't supposed to be there.

Waterproof Liquid Eyeliner:

Phase	Ingredient	% w/w
A	Water	q.s. to 100
A	SQ-SE 8100	20.0–30.0
A	Propylene Glycol	3.0–5.0
B	Black Iron Oxide	10.0–15.0
B	Dispersant	1.0–2.0
C	Thickener	0.5–1.5
C	Preservative	0.5–1.0

Key takeaway: With 20–30% SQ-SE 8100, the film sets instantly and stays immovable—oil won't melt it, sweat won't break it, and it will never pool under your consumer's eyes like a dark circle

Foundation – No White Sweat Streaks, No Melting, No Patchiness

The unique challenge: Foundation faces two completely different enemies—sweat and sebum—and each destroys the film in its own way. When the face sweats, water pushes through the film from underneath, carrying dissolved pigments and emulsifiers with it. The sweat droplets roll down the face, leaving white or tinted streaks in their path—consumers call this the "white sweat soup" effect. The foundation doesn't just fade; it tracks down the face in visible lines. When the skin produces oil, on the other hand, the film softens unevenly. Pigments detach and aggregate, making the foundation look patchy and separated. The makeup stops adhering to the skin and starts "floating," settling into pores and fine lines instead of staying uniform. Most film formers can only handle one of these two enemies—acrylates resist oil but crack under sweat; waxes repel water but melt with sebum; PVP dissolves in both. None of them can survive a full day of both sweat and oil.

How SQ-SE 8100 solves it: 

• 1.Water Repellency: It repels water from the outside and prevents sweat from pushing through from underneath. No dissolution, no pigment washout, no white streaks trailing down the face.
• 2.Oil Resistance: The film is oil‑resistant—sebum cannot soften or break the matrix. Pigments stay uniformly distributed; the film remains intact and adhered to the skin.
• 3.Flexibility: It moves with facial expressions rather than cracking, so no patchy gaps appear.
• 4.Long-Lasting Durability: It holds the foundation in place through sweat, through oil, through heat, and through the longest days—no white tracks, no pooling, no floating.

Your current film former is forcing you to choose between durability and comfort, water resistance and removability, flexibility and strength. It is forcing your eyeliner to melt into dark circles and your foundation to run in white streaks. SQ-SE 8100 eliminates every choice. It outperforms acrylates, waxes, and PVP across every metric that matters—and it does so in mascara, eyeliner, and foundation alike. There is no reason to compromise any longer. Switch to SQ-SE 8100 and give your formulas the film former they deserve.