Study question
A cosmetic serum package may appear stable on the bench but behave differently after storage, shipping, or consumer travel. For a wand-and-wiper applicator, package integrity involves more than leakage. The cap, tube, wand, brush, and wiper must continue working together after environmental exposure so the package opens cleanly and dispenses a controlled amount of serum.1,2
The manufacturer needed data showing how three anonymized variants would perform under conditions related to storage, shipping, and use. A simple pass/fail leak check could not answer the full product-development question. Even without obvious external leakage, a displaced wiper, bent wand, or product buildup on the applicator could affect usability.1,2
Why ARE Labs used two environmental studies
ARE Labs designed two complementary studies to separate temperature effects from pressure-change effects. The climate storage study examined the formulation-package system under cold, room-temperature, warm, and high-temperature conditions. The altitude simulation study examined how the package responded to pressure differentials associated with transport or use at elevation.2,3,4
Separating these effects was important because cosmetic package evaluations often emphasize temperature. Heat and cold can affect viscosity, evaporation, plastic components, seals, and usability. Altitude may receive less attention, but pressure changes can matter for packages containing liquid, headspace, closures, applicators, or other internal components. ASTM D6653/D6653M provides public standards context for evaluating high-altitude package effects by vacuum method. FDA cosmetic materials provide context for the product category but do not imply FDA approval.2,3,4
Climate storage simulation
The climate study included 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 remained in storage for 226 hours, and observations were recorded every 24 hours.1
At each observation interval, ARE Labs evaluated one sample immediately after removal from storage and another after 4 hours at room temperature. Samples were weighed before and after exposure. The inspection covered 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 effects of environmental stress and behavior after a short recovery period. The distinction was most important at low temperature, where the serum was temporarily frozen immediately after removal but thawed during the room-temperature hold. Evaluating the full applicator system also prevented the package from being treated as a container alone.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-related pattern. Samples tested at -30 deg C and 5 deg C had no measurable weight loss. Weight loss was observed at 23 deg C and above, with a maximum observed loss of 15 mg across the three anonymized variants at 23 deg C. Maximum observed losses increased at 40 deg C and 60 deg C, with the summarized report data showing elevated-temperature values from about 51 mg to 95 mg.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 added important context to the mass measurements. At 5 deg C and 23 deg C, the products generally behaved normally, although product occasionally accumulated on the wand. Wand accumulation became more pronounced at 40 deg C, where isolated crystallization was also observed. The clearest package-function concern occurred at 60 deg C: wands bent, and wipers became displaced from the package body during opening.1
The wiper became the critical component
The wiper was particularly important because it controlled how much serum remained on the wand. When it stayed seated and worked normally, it removed excess product. When the wiper became displaced, the wand retained more serum and appeared visibly overloaded.1
This finding moved the interpretation beyond a narrow leak check and toward package function. Although the tube could appear mostly intact from the outside, the relationship among the internal components had changed. For R&D, quality, and product-management teams, that was the actionable signal: the product-package system needed to be assessed as a working applicator, not simply 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 produce the same pattern
The altitude study included 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. Testing used a sealed vacuum chamber. ARE Labs inspected the samples immediately after exposure and again after 4 hours at room temperature and pressure.2,3
All tested samples passed inspection at both post-exposure time points. No serum leakage was observed, and weight loss remained minimal. This negative finding still helped the manufacturer narrow the risk question. For this package, pressure-change exposure did not reproduce the package-function changes observed 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 do not support broad conclusions about every wand-and-wiper package or cosmetic serum formulation. For this specific anonymized configuration, elevated-temperature storage produced a stronger risk signal than simulated altitude exposure. The cold-temperature result also showed why recovery timing matters: observing a frozen product immediately after exposure has a different product-development meaning than observing that it thawed after 4 hours at room temperature.1,2
For similar programs, inspection criteria should reflect how the product is actually used. If the consumer experience depends on a component remaining seated, an applicator staying straight, or product loading remaining controlled, the protocol should evaluate those behaviors alongside mass change and visible leakage.1,2
Summary
The study found that elevated-temperature storage, particularly at 60 deg C, produced a stronger risk signal for this anonymized package than simulated altitude exposure. This distinction helped the client focus development work on package function, wand-and-wiper interaction, and temperature-related product presentation. ARE Labs connected the study design, inspections, data review, and interpretation to the measured evidence.1,2