Study question
A cosmetic serum package can look stable on the bench and still behave differently after storage, shipping, or consumer travel. For a wand-and-wiper applicator, package integrity is not only a leak question. The cap, tube, wand, brush, and wiper have to keep working together after environmental exposure so the product opens cleanly and presents a controlled amount of serum.1,2
The manufacturer needed a data-backed view of how three anonymized variants would perform under conditions connected to storage, shipping, and use. A simple pass/fail leak check would not answer the full product-development question because a wiper that moves, a wand that bends, or product that accumulates on the applicator can affect usability even if the package exterior does not show dramatic leakage.1,2
Why ARE Labs used two environmental studies
ARE Labs designed two complementary studies so the manufacturer could separate temperature effects from pressure-change effects. Climate storage asked what happened to the formulation-package system under cold, room-temperature, warm, and high-temperature environments. Altitude simulation asked what happened when the package experienced a pressure differential associated with transport or use at elevation.2,3,4
That separation mattered because cosmetic package evaluations often focus heavily on temperature. Heat and cold can affect viscosity, evaporation, plastic components, seals, and usability. Altitude can be easier to overlook, but pressure change may matter for packages with liquid, headspace, closures, applicators, or internal components. ASTM D6653/D6653M provides public standards context for high-altitude package effects by vacuum method, while FDA cosmetic materials frame the product category without implying approval.2,3,4
Climate storage simulation
The climate study evaluated 210 total samples across three anonymized product variants. Each variant contributed 70 samples, with 14 samples assigned to each of five temperature conditions: -30 deg C, 5 deg C, 23 deg C, 40 deg C, and 60 deg C. Samples were stored for 226 hours, with observations recorded every 24 hours.1
At each observation interval, one sample was evaluated immediately after removal from storage and another was evaluated after 4 hours at room temperature. ARE Labs weighed the samples before and after exposure and inspected the package exterior, neck and thread area, internal visual indicators, wand condition, brush appearance, crystallization, product accumulation on the wand, and wiper seating.1
This approach captured both immediate stress effects and short recovery behavior. That distinction mattered most at low temperature, where the serum temporarily froze immediately after removal but thawed after a room-temperature hold. It also tied the study to the actual applicator system instead of treating the package as only a container.1
| Study | Product category | Study size | Conditions tested | Observation plan | Primary purpose |
|---|---|---|---|---|---|
| Climate storage simulation | Cosmetic eyelash serum in wand-and-wiper package | 210 total units | -30 deg C, 5 deg C, 23 deg C, 40 deg C, 60 deg C | Observations every 24 hours over 226 hours; immediate and 4-hour room-temperature observations | Evaluate temperature effects on formulation-package behavior, mass change, and usability |
| Altitude leak-resistance simulation | Cosmetic eyelash serum in wand-and-wiper package | 54 total units | Simulated 18,000 ft, 26,000 ft, 40,000 ft | Immediate and 4-hour post-exposure inspections | Evaluate leak resistance and package behavior under simulated pressure-change conditions |
Climate storage produced the main signal
The climate study showed a clear temperature pattern. At -30 deg C and 5 deg C, the tested samples did not show measurable weight loss. At 23 deg C and higher, weight loss was observed. The maximum observed loss at 23 deg C was 15 mg across the three anonymized variants. At 40 deg C and 60 deg C, maximum observed losses increased, with elevated-temperature values ranging from about 51 mg to 95 mg in the summarized report data.1
Source: anonymized ARE Labs climate storage simulation report.
- One 40 deg C Variant A value was tied to a single unit.
- Altitude exposure is discussed separately because no leakage was observed in the tested altitude set.
| Storage temperature | Variant A max loss | Variant B max loss | Variant C max loss | Article interpretation |
|---|---|---|---|---|
| -30 deg C | 0 mg | 0 mg | 0 mg | No measurable weight loss; temporary freezing observed immediately after removal |
| 5 deg C | 0 mg | 0 mg | 0 mg | No measurable weight loss |
| 23 deg C | 15 mg | 15 mg | 15 mg | Weight loss began at room temperature |
| 40 deg C | 93 mg | 52 mg | 51 mg | Elevated-temperature weight loss; increased product accumulation; isolated crystallization |
| 60 deg C | 88 mg | 95 mg | 90 mg | Highest functional concern; bent wands and wiper displacement |
One 40 deg C Variant A value was tied to a single unit; excluding that unit, the Variant A maximum at 40 deg C was 46 mg.
The qualitative observations were as important as the mass measurements. At 5 deg C and 23 deg C, the products generally behaved normally, with occasional product accumulation on the wand. At 40 deg C, wand accumulation became more pronounced and isolated crystallization was observed. At 60 deg C, the highest-temperature condition produced the clearest package-function concern: wands bent, and wipers became displaced from the package body during opening.1
The wiper became the critical component
The wiper was one of the most important components because it regulated how much serum remained on the wand. When the wiper stayed seated and functioned normally, it helped control excess product. When the wiper became displaced, the wand carried more product and became visibly overloaded.1
That finding shifted the interpretation from a narrow leak check to a package-function assessment. The tube could appear mostly intact externally, but the relationship between internal components had changed. For R&D, quality, and product-management teams, that was the actionable signal: the product-package system needed to be evaluated as a working applicator, not just as a sealed container.1
| Condition | Key observation used | Interpretation used |
|---|---|---|
| -30 deg C | Serum froze immediately after removal but thawed after 4 hours at room temperature | Temporary cold-temperature usability issue; not treated as persistent package failure |
| 5 deg C | Samples generally behaved normally | Lower-temperature storage did not produce the main risk signal |
| 23 deg C | Occasional product accumulation on wand; weight loss observed | Early temperature-related change |
| 40 deg C | More pronounced wand accumulation; isolated crystallization | Elevated-temperature effects became more visible |
| 60 deg C | Bent wands; wipers detached or became stuck on wand | Main package-function concern affecting usability |
| Simulated altitude exposure | No leakage observed at tested altitudes | Altitude was not the primary risk driver for this package in the tested conditions |
Altitude exposure did not create the same pattern
The altitude study evaluated 54 total samples across the same three anonymized product variants. Each variant contributed 18 samples, with six samples exposed at each simulated altitude: 18,000 ft, 26,000 ft, and 40,000 ft. The study used a sealed vacuum chamber, followed by immediate inspection and another inspection after 4 hours at room temperature and pressure.2,3
All tested samples passed the inspections at both post-exposure time points. No serum leakage was observed, and weight loss remained minimal. That negative finding was still useful because it helped the manufacturer narrow the risk question. In this package, pressure-change exposure did not reproduce the package-function changes seen during elevated-temperature storage.2,3
Product-development implication
- Elevated-temperature storage deserved more attention than altitude exposure for this specific product-package configuration.1,2
- The package needed to be interpreted as a system because the most important finding involved the wand and wiper relationship.1
- The cold-temperature observation benefited from immediate and 4-hour checks because the serum froze after removal and then thawed at room temperature.1
The documented results did not make broad claims about every wand-and-wiper package or every cosmetic serum formula. They showed that, for this specific anonymized configuration, elevated-temperature storage deserved more attention than simulated altitude exposure. The cold-temperature observation also showed why recovery timing matters: an immediate freezing observation and a 4-hour thaw observation carry different product-development meaning.1,2
For similar programs, the lesson is to define inspection criteria around the product's real use. If the consumer experience depends on a component staying seated, an applicator remaining straight, or product loading staying controlled, those observations should be built into the protocol alongside mass change and visible leakage.1,2
Summary
In summary, the study showed that elevated-temperature storage, especially 60 deg C, was the stronger risk signal for this anonymized package than simulated altitude exposure. That distinction helped the client focus development attention on package-function behavior, wand-and-wiper interaction, and temperature-related product presentation. ARE Labs supported the work by connecting the study design, inspections, data review, and interpretation to the measured evidence.1,2