Buyer questions · Purchase decisions
Our high-concentration VC serum changed color in aluminum tubes. What compatibility tests can the factory run to determine if it's packaging or formulation?
Attribution of color change in aluminum tubes requires a glass control test to distinguish package corrosion from Vitamin C auto-oxidation. Assess pH and coating integrity. Testing includes mass loss, color difference, and metal ion migration, verified with room-temperature controls.
1Inert Control & Corrosion Check
Use a glass vial as an inert control. Evaluate aluminum coating integrity and pH levels to rule out corrosion, gas generation, and coating failure.
2Migration & Mass Loss Indicators
Measure mass loss and metal ion migration (Al, Fe). For strong reducing agents, prioritize all-plastic pump systems to prevent metal contact.
3Dual-Track Validation
3-month accelerated testing (40°C) is for risk screening only; room-temperature samples are mandatory. Re-testing is required for packaging or colorant changes.
Follow-up questions
- Q:Is re-testing required for packaging changes?
- A:Yes. Changes in colorants or packaging materials require new compatibility evaluations.
- Q:Can only accelerated data be provided?
- A:No. Accelerated data alone cannot confirm long-term stability; room-temperature controls are required.
Updated 2026-09-18
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