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| Negative pressure method | Positive pressure method | Vacuum attenuation method | |
| Method | Put the sample into water and vacuumizing, observing the leakage situation by whether there are steady progression of bubbles from the specimen or whether the Methylene blue water enters the sample after vacuum reduction |
Punch a hole on the object to be measured, flush gas into it, and put it into water. Observe whether there is a dew point by observing whether there are bubbles emerging during the pressure maintaining process. | Put the sample into the vacuum chamber, and observe the coincidence of the pressure curves of the sample and the standard sample after vacuumizing, so as to judge whether there is leakage or not |
| Advantage | 1. The results is visible 2. Widely used 3. High industry acceptance |
|
1. convenient and fast 2. traceability 3. Repeatable 4.Nondestructive testing 5. Small human factors 6.High sensitivity 7.Quantitative test 8. Easier to detect smaller leakage point and Irregular leak |
| Shortcoming | 1.Destructive testing 2.Subjective factors, easy to misjudge 3.Low sensitivity and difficult to judge micropores |
1.Destructive testing 2.Long test time 3.Unable to determine the micropores leakage |
High cost |
| Summary | The vacuum method is a commonly used method to test the leakage. According to research, although water molecules can pass through when encountering a 5um leak, but it is different to observe when encountering a 5um micropore infiltration of liquid during testing, which makes misjudgment. And the sample can't be used again after leak testing. | Each sample for destructive test can only be used for preliminary research, not suitable for product delivery inspection. | Although the vacuum decay leak tester is expensive, it is currently a more effective, intuitive and efficient leak detection method. Besides, the sample will not be contaminated after inspection and can be used normally. |
| Basic Application | Flexible, non-porous packages including bags and pouches containing solids |
| Sealed cups or trays containing solids | |
| Non-lidded, empty cups or trays | |
| Rigid, non-porous containers including: | |
| Plastic screw capped bottles containing solids or liquids | |
| Glass or plastic vials containing liquids or solids | |
| Glass or plastic ampoules containing liquids | |
| Glass pre-filled syringes containing liquids or solids | |
| Ophthalmic dropper tip bottles containing liquids | |
| Blow Fill Seal bottle or strip containing liquid |
| Specifications | LEAK-M |
| Absolute Vacuum Degree | 10Pa (0.1mbar) |
| Sensitivity | The leak rate of 0.05ccm can be detected |
| Authority management | 4 level |
| Opening Method | pneumatic |
| Gas Supply Pressure | 0.7 MPa |
| Port Size | Φ6 mm PU Tubing |
| Display Mode | 10.1"colorful touch screen |
| Instrument Dimension | 380mm(L)×260mm(W)×210mm(H) |
| Power Supply | AC 220V 50Hz / AC 120V 60HZ |
| Negative pressure method | Positive pressure method | Vacuum attenuation method | |
| Method | Put the sample into water and vacuumizing, observing the leakage situation by whether there are steady progression of bubbles from the specimen or whether the Methylene blue water enters the sample after vacuum reduction |
Punch a hole on the object to be measured, flush gas into it, and put it into water. Observe whether there is a dew point by observing whether there are bubbles emerging during the pressure maintaining process. | Put the sample into the vacuum chamber, and observe the coincidence of the pressure curves of the sample and the standard sample after vacuumizing, so as to judge whether there is leakage or not |
| Advantage | 1. The results is visible 2. Widely used 3. High industry acceptance |
|
1. convenient and fast 2. traceability 3. Repeatable 4.Nondestructive testing 5. Small human factors 6.High sensitivity 7.Quantitative test 8. Easier to detect smaller leakage point and Irregular leak |
| Shortcoming | 1.Destructive testing 2.Subjective factors, easy to misjudge 3.Low sensitivity and difficult to judge micropores |
1.Destructive testing 2.Long test time 3.Unable to determine the micropores leakage |
High cost |
| Summary | The vacuum method is a commonly used method to test the leakage. According to research, although water molecules can pass through when encountering a 5um leak, but it is different to observe when encountering a 5um micropore infiltration of liquid during testing, which makes misjudgment. And the sample can't be used again after leak testing. | Each sample for destructive test can only be used for preliminary research, not suitable for product delivery inspection. | Although the vacuum decay leak tester is expensive, it is currently a more effective, intuitive and efficient leak detection method. Besides, the sample will not be contaminated after inspection and can be used normally. |
| Basic Application | Flexible, non-porous packages including bags and pouches containing solids |
| Sealed cups or trays containing solids | |
| Non-lidded, empty cups or trays | |
| Rigid, non-porous containers including: | |
| Plastic screw capped bottles containing solids or liquids | |
| Glass or plastic vials containing liquids or solids | |
| Glass or plastic ampoules containing liquids | |
| Glass pre-filled syringes containing liquids or solids | |
| Ophthalmic dropper tip bottles containing liquids | |
| Blow Fill Seal bottle or strip containing liquid |
| Specifications | LEAK-M |
| Absolute Vacuum Degree | 10Pa (0.1mbar) |
| Sensitivity | The leak rate of 0.05ccm can be detected |
| Authority management | 4 level |
| Opening Method | pneumatic |
| Gas Supply Pressure | 0.7 MPa |
| Port Size | Φ6 mm PU Tubing |
| Display Mode | 10.1"colorful touch screen |
| Instrument Dimension | 380mm(L)×260mm(W)×210mm(H) |
| Power Supply | AC 220V 50Hz / AC 120V 60HZ |
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