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Test Method for Sealing Performance of Packages
On August 1, 2025, GB/T 15171-2025 Test Method for Sealing Performance of Packages was officially issued by the Standardization Administration of China. This new national standard will revolutionize quality control workflows for food and pharmaceutical packaging industries.
Issued by SAC, GB/T 15171-2025 will be fully implemented on February 1, 2026, replacing the 31-year-old GB/T 15171-1994 version.
The standard expands coverage and introduces the vacuum decay method as a quantitative testing solution, shifting packaging leak testing from qualitative visual judgment to precise quantitative analysis.
1 Three Core Breakthroughs of the New Standard
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Expanded Application Scope
Coverage extended from solely flexible packages to flexible, semi-rigid and rigid packages, covering all mainstream packaging forms.
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Dual Testing System Established
Two parallel test methods are standardized: underwater bubble test (traditional visual inspection) and vacuum decay test (quantitative leak measurement).
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Quantitative Evaluation Indicators Added
New metrics including vacuum decay rate and target vacuum level are defined, greatly improving test repeatability and comparability across labs.
2 Technical Introduction to Two Test Methods
2.1 Underwater Bubble Test
Immerse the specimen fully in a water-filled vacuum chamber and apply negative pressure from -30 kPa to -90 kPa. Continuous bubbles or water ingress indicate seal failure.
- Applicable to packages with water-resistant outer films; intuitive observation
- Requires high-precision vacuum control for stable test conditions
- Test workflow: sample preparation → vacuum pumping → bubble observation → result judgment
- Specimen must be submerged with at least 25 mm water above its top surface.
LEAK-01 Underwater Bubble Leak Tester fully aligned with GB/T 15171-2025.
Specially designed for the underwater bubble test method with competitive technical strengths:
- Aerospace-grade vacuum tank material + independent dual power supply; custom vacuum chambers from Φ270 mm to Φ460 mm to fit various package sizes.
- Gradient vacuum testing mode: staged negative pressure from -20 kPa to -90 kPa to accurately locate critical leak threshold. Automatic constant pressure air supplementation maintains stable vacuum during testing.
- Optional GMP-compliant PC software supporting electronic signature, audit trail and encrypted data storage, meeting pharmaceutical factory regulatory requirements.
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