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Leakage Tester - Positive Pressure Sealing Tester
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- Commodity name: Leakage Tester - Positive Pressure Sealing Tester
STM-P
Positive Pressure Package Leak Tester — Multi-Function Model
Overview
The LabStone Positive Pressure Leak Tester is a professional laboratory instrument designed to evaluate the sealing integrity, pressure resistance, and leak rate of rigid and semi-rigid containers such as bags, bottles, tubes, cans, boxes, and caps.Unlike vacuum-based methods, the positive pressure approach applies internal gas pressure to simulate real-world stress conditions, making it the preferred choice for sterile packaging, aerosol cans, pharmaceutical caps, and cosmetic tubes.This instrument integrates three testing technologies into one compact unit, providing a comprehensive solution for incoming QC, R&D validation, and regulatory compliance across the pharmaceutical, food, beverage, and daily chemical industries.Key Functions:
Seal Integrity Testing (Bubble Detection Method)
Pressure Resistance Testing (Burst / Creep Evaluation)
Leak Rate Testing (Quantitative Pressure Decay Measurement)
Applicable to bags, bottles, tubes, cans, boxes, blister packs, and closures made of plastic, laminate, foil, glass, or metal.
Principle:
The instrument employs the Positive Pressure Method with three selectable test modes:1. Bubble Detection (Qualitative)
The specimen is placed underwater and pressurized internally. A stable internal-external pressure differential forces escaping gas to form bubbles in the water. Bubble formation is magnified 5–10× for easy visual observation of seal failure.2. Pressure Resistance Detection (Strength)
The specimen is mounted on a test rack and pressurized internally. The operator visually inspects for detachment, rupture, or creep to determine the maximum pressure the package can withstand.3. Leak Rate Detection (Quantitative)
After pressurizing the specimen, gas loading stops. The system automatically measures the decay rate of internal pressure over time, calculating the leak rate (kPa/s) to precisely quantify sealing performance.Compliant Standards:
GB/T 10440‑2023 — Cylindrical composite cans (replaces GB/T 10440‑2008, now obsolete)
GB/T 18454‑2023 — Composite bags for aseptic packaging of liquid foods (replaces GB/T 18454‑2001, now obsolete)
GB/T 19741‑2005 — Composite flexible packaging for fruit and vegetable juices
GB 17447‑2012 — Aerosol valves
GB/T 17876‑2010 — Plastic tamper-evident closures for packaging containers (currently valid)
BB/T 0003‑2016 — Retort pouches
BB/T 0025‑2016 — 25.4 mm diameter aluminium spray cans
YBB 00252005‑2015 — Pharmaceutical aluminium-plastic combination caps
YBB 00162002‑2015 — Seal integrity testing for pharmaceutical packaging materialsKey Features:
Three-in-One Integrated Testing
Combines bubble detection, pressure resistance, and leak rate measurement in a single instrument — eliminating the need for multiple standalone devices.Ultra-High Precision
Resolution: 0.01 kPa — captures microscopic pressure decay invisible to conventional gauges.Pressure Range: 0–300 kPa (standard); 0–1 MPa (optional).Automatic Pressure Stabilization
Intelligent microcomputer control automatically maintains constant pressure, ensuring high accuracy and repeatability.User-Friendly Operation
Color LCD display with intuitive digital controls.Fully automated test sequence: automatic pressurization, pressure holding, relief, and reset.Manual or automatic mode selection.Flexible Data Reporting
Single-test or group-test printing.Reports include: test result (Pass/Fail), test pressure, dwell time, date/time stamp.Transparent Test Tank
Φ300 × 330 mm transparent chamber allows clear observation of bubble formation at 5–10× magnification.Technical Specifications
- Pressure Range: 0–300 kPa (standard); 0–1 MPa (optional)
- Resolution: 0.01 kPa
- Leak Rate: 0.1–300 kPa/s (standard)
- Dwell Time: 0–9999 s (adjustable)
- Transparent Tank: Φ300 × 330 mm
- Air Supply Pressure: 0.4–1 MPa (user-provided)
- Air Supply Interface: Φ8 mm polyurethane tube
- Control Box Dimensions: Φ350 × 260 mm
- Power Supply: AC 220V, 50Hz; Power: <200W
- Net Weight: 23 kg
Standard Configuration: Transparent tank, test rack, main unit.
Fixtures：Non-standard fixtures require customization based on user needs.
User-Provided Item：Compressed air source.Application Industries & Scenarios
Pharmaceutical & Biotech
Aseptic Bags & IV Bags: Verify seal strength and detect micro-leaks in parenteral nutrition and infusion solutions.Pharmaceutical Caps: Evaluate aluminium-plastic combination caps for injection vials and infusion bottles.Ointment & Cream Tubes: Test tube tail seals for creep and burst under internal pressure.Food & Beverage
Aseptic Brick & Pillow Packs: Positive-pressure leak detection for UHT milk, juice, and soy products.Spray Cans & Aerosols: Pressure resistance testing of aerosol valves per GB 17447.Spouted Pouches & Stand-Up Bags: Assess seal integrity at the spout-to-body interface.Daily Chemicals & Cosmetics
Lotion & Cream Tubes: Validate tube tail sealing and cap liner integrity.Perfume & Essential Oil Bottles: Verify dropper and cap seal performance under pressure.Third-Party Testing & R&D
CNAS/CMA-compliant testing for regulatory submission.Comparative studies of packaging materials and sealing processes.Frequently Asked Questions (FAQ)
Q1: What is the difference between positive pressure and vacuum (negative pressure) leak testing?A: Vacuum testing pulls air out of the package to detect outward gas escape — ideal for flexible pouches. Positive pressure testing pushes gas into the package to simulate internal pressure — essential for rigid/semi-rigid containers like bottles, cans, and tubes. If you test aseptic bags, spray cans, or pharmaceutical caps, positive pressure is the correct method.Q2: How accurate is the 0.01 kPa resolution in practice?A: Ultra-high resolution allows detection of minute pressure decay corresponding to micro-leaks invisible to the naked eye. For pharmaceutical aluminium-plastic caps or aseptic bags, this precision ensures compliance with strict seal integrity requirements and prevents product failure during distribution.Q3: Are the Chinese national standards referenced by this instrument still valid?A: We have updated all standards to their latest editions. GB/T 10440-2008 and GB/T 18454-2001 are obsolete; the current versions are GB/T 10440-2023 and GB/T 18454-2023. All standards listed in this document are currently recognized for regulatory and QC purposes.Q4: Can this instrument perform quantitative leak testing, or only pass/fail?A: It supports both. Bubble detection provides qualitative visual assessment, while the leak rate mode delivers fully quantitative measurement of pressure decay (kPa/s) for precise, data-driven quality decisions.Q5: What kind of air compressor do I need?A: Any clean, oil-free compressed air source delivering 0.4–1 MPa is sufficient. The connection uses a standard Φ8 mm polyurethane tube.Q6: Can non-standard or custom-shaped containers be tested?A: Yes. While the standard configuration covers common geometries, non-standard fixtures can be custom-manufactured to accommodate unique container shapes or closure designs.Q7: Is this instrument suitable for GMP environments?A: Yes. The instrument provides documented, repeatable results with printed test reports including timestamp, pressure, and dwell time — fully compatible with GMP, ISO 11607, and HACCP quality systems. -
Functions
Sealing performance and strength testing for containers such as bags, bottles, tubes, cans, boxes, lids, etc.Principle:
- Positive Pressure Method
- Bubble Detection: Place the specimen underwater. The system applies pressurized gas inside the specimen to create a stable internal-external pressure difference. Observe gas leakage (bubbles magnified 5-10 times) in water to evaluate sealing performance.
- Pressure Resistance Detection: Place the specimen on the test rack. The system applies pressurized gas inside the specimen. Visually inspect for detachment, rupture, or creep to assess pressure resistance.
- Leak Rate Detection: After pressurizing the specimen, the system stops gas loading and automatically measures the decay rate of internal pressure over time (leakage rate) to determine sealing performance.
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Standards Compliance:
GB/T 10440, GB/T 18454, GB/T 19741, GB 17447, GB/T 17876, BB/T 0003, BB/T 0025, YBB 00252005, YBB 00162002, etc. -
Technical Features
- Integrated testing technologies: bubble detection, pressure resistance, and leak rate measurement.
- Parameterized settings for test pressure and dwell time.
- Automatic pressure stabilization for precise and stable testing.
- Color LCD display with digital controls and automated testing: automatic pressure relief, test termination, and pressure recovery.
- Flexible test data printing: group or single test reports, including evaluation, test pressure, and dwell time.
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Technical Specifications
- Pressure Range: 0–300 kPa (standard); 0–1 MPa (optional)
- Resolution: 0.01 kPa
- Leak Rate: 0.1–300 kPa/s (standard)
- Dwell Time: 0–9999 s (adjustable)
- Transparent Tank: Φ300 × 330 mm
- Air Supply Pressure: 0.4–1 MPa (user-provided)
- Air Supply Interface: Φ8 mm polyurethane tube
- Control Box Dimensions: Φ350 × 260 mm
- Power Supply: AC 220V, 50Hz; Power: <200W
- Net Weight: 23 kg
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Standard Configuration：Transparent tank, test rack, main unit.
Fixtures：Non-standard fixtures require customization based on user needs.
User-Provided Items：Compressed air source.
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