Hybrid filter direction
The formula direction combines complementary UV-filter approaches.
Eternus
Hybrid Facial Sunscreen SPF 50
A fragrance-free facial sunscreen designed to complete a sensitive-skin morning routine. Final SPF and UVA claims require the appropriate finished-product testing.
Product promise
Daily protection must be proven, wearable and compatible with the routine beneath it.
The formula is organised as a system. Each part has a defined role rather than a decorative ingredient story.
Film-forming base
Designed to create an even, continuous protective film when used as directed.
Routine compatibility
The texture direction prioritises wear over moisturiser and serum.
Recorded screening
Performance Testing
The current workbook records formulation screening across pH, viscosity, centrifuge response, spread area and sensory attributes. These measurements describe development behaviour; they do not establish commercial sunscreen efficacy.
Recorded sensory profile
Application and finish attributes
0–10Descriptive scale
How to read
The outer ring means more of the named attribute, not a better result. Scores follow the recorded 0–10 sensory anchors.
View recorded data
| Attribute | Score |
|---|---|
| Gloss | 7 |
| Thickness | 6 |
| Spreadability | 8 |
| Absorption rate | 4 |
| Residual film | 5 |
| Greasy afterfeel | 6 |
Preliminary in-house screening. Long-term stability, preservative efficacy and dermatological testing would be required before final commercial claims.
pH screening
Recorded pH across four days
6.58Day 4 mean pH
Method note
T = 0 was measured by strip; day 4 used a meter. The connecting line provides context only and should not be read as a validated stability trend. The displayed pH range is 5–9.
View recorded data
| Time | Method | Rep 1 | Rep 2 | Rep 3 | Mean | Temp |
|---|---|---|---|---|---|---|
| T = 0 | Strip | 8.00 | 8.00 | 8.00 | 8.00 | 25°C |
| Day 4 | Meter | 6.58 | 6.57 | 6.59 | 6.58 | 23°C |
Preliminary in-house screening. Long-term stability, preservative efficacy and dermatological testing would be required before final commercial claims.
Spread screening
Mean diameter and calculated coverage area
4.48 mm²Mean spread area
Calculation note
Coverage area is calculated from each replicate’s mean spread diameter. Marker shape and direct labels distinguish the replicates without relying on colour alone.
View recorded data
| Rep | d₁ | d₂ | Mean diameter | Area | Temp |
|---|---|---|---|---|---|
| 1 | 2.40 mm | 2.40 mm | 2.400 mm | 4.524 mm² | 23°C |
| 2 | 2.37 mm | 2.41 mm | 2.390 mm | 4.486 mm² | 23°C |
| 3 | 2.40 mm | 2.35 mm | 2.375 mm | 4.430 mm² | 23°C |
Preliminary in-house screening. Long-term stability, preservative efficacy and dermatological testing would be required before final commercial claims.
Selected literature notes
Ingredient Evidence
The selected literature informs the formulation direction. It does not represent clinical testing of the finished product.
UV-filter architectureHybrid formulation direction
Literature informs filter selection but does not establish the finished product’s SPF.
Film formationEven application and film continuity
Supports the formulation focus on coverage and wear.
Routine compatibilityLayering over skincare
Informs texture and finish decisions for the final morning step.
Current formula record
Eternus formula-derived declaration
Published for ingredient transparency while the formulas move through final production and label review.
Aqua (Water), Zinc Oxide, Caprylic/Capric Triglyceride, Cetearyl Alcohol, Bis-Ethylhexyloxyphenol Methoxyphenyl Triazine, Coco-Caprylate/Caprate, Isoamyl Laurate, Glycerin, Propanediol, C12-15 Alkyl Benzoate, Squalane, Cetearyl Glucoside, Dimethicone, Dimethiconol, Phenoxyethanol, Ethylhexylglycerin, Glyceryl Stearate Citrate, Tocopherol, Polyhydroxystearic Acid, Xanthan Gum, Sodium Phytate.
Provisional order derived from the current percentage formula. The exact composition of the zinc dispersion and other supplier blends must be reconciled before final sunscreen label and regulatory review.
Lab notebook
Development Story
“Eternus was defined as the product that must work with every step beneath it while still meeting a much higher evidence bar than ordinary skincare.”
The development direction prioritises film formation, wear, pack compatibility and validated sun-protection testing. No final SPF claim should rely on formulation theory alone.
- Even film formation
- Wear over moisturiser
- Pack compatibility
- Validated SPF and UVA evidence required
Packaging & Responsibility
Responsibility Notes
Packaging choices are considered alongside formula performance. These notes describe the current direction, not a claim of environmental perfection.
- Primary pack
- Slim tube direction
- Dispensing
- Controlled dispensing through a flip cap
- Secondary pack
- Secondary packaging kept materially restrained
- Under review
- Transport impact and component recyclability remain under evaluation
Routine guidance
How to use
Introduce one new formula at a time. Final directions on the product label take precedence.
- 1
Apply
Use generously as the final morning step.
- 2
Cover
Apply evenly to exposed facial areas according to final label directions.
- 3
Reapply
Reapply according to exposure, activity and the validated product label.
Frequently asked questions
Is SPF 50 already a final commercial claim?
The final claim requires the appropriate finished-product SPF and UVA testing.
Where does Eternus sit?
It is the final morning step.
Is it fragrance free?
Yes. Eternus contains no added fragrance.
Can sunscreen replace moisturiser?
That depends on skin needs and the final formula. Use the routine that remains comfortable and follow label directions.
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