Leak tightness/leakage test/pores
These tests are used to locate defects, leaks, micro-holes (pinholes), leakages and so forth in packagings, pouches, sacks and films. Depending on the problem and material, various methods are used, e.g. gas detection, dye penetration, chemical copper deposition, resistance against water or visual inspection on standardized light box. Please do not hesitate to contact us, we will be pleased to assist you in selecting a suitable method for your questions.
To prepare an offer we need the following information:
What type of packaging should be tested (size, filling volume)?
How many packages should be stored?
Are the packages empty or do they have to be emptied before testing?
Which contents are involved (CAS no./ safety data sheet)?
Leak tightness/leakage test/pores: dye penetration test ASTM F 1929 This method works by using a dye solution on aqueous basis with wetting agent. It is used in practice for the examination of various packaging materials and is suitable for the detection of leaks with a size of min. approx. 50. By using sufficient exposure usually even by dried filling tightend leaks and cannulas are detected again. The method is not suitable for testing the performance of water-soluble coatings. When testing medical packaging with one porous side, the exposure time should not exceed 20 s to prevent the dye from penetrating the porous material and making evaluation difficult. Norm: ASTM F 1929
Leak tightness/leakage test/pores: Color method (methylene blue in ethanol) DIN 55508-2 This method works using a test fluid on an ethanolic basis with methylene blue as the dye. It is used in practice for the examination of various packaging materials and is suitable for the detection of leaks with a size of min. approx. 10- 20 µm. By using sufficient exposure usually even by dried filling tightend leaks and cannulas are detectable again. The method is not suitable for testing the performance of coatings soluble in ethanol. Norm: DIN 55508-2
Leak tightness/leakage test/pores: creep oil methode inhouse method This method works by using a dyed fluid based on penetrating oil. It is used in practice for the examination of various packaging materials and experience has shown, that it is also suitable for detecting the smallest micropores and cannulas (pinholes). By using sufficient exposure usually even by dried filling tightend leaks and cannulas are detected again. Norm: Hausverfahren PV036
Leak tightness/ leakage test/ pin holes: light box inspection The test is performed using a light table with 1000 - 1500 lux illumination in a darkened room with less than 50 lux illumination. It can be recognized from pores of a size of about 20 microns. The method is particularly suitable for testing of web materials, preferably aluminum foil or light-tight colored materials. Norm: DIN EN 546-4
Leak tightness/leakage test/pores: with real filling goods This method works by using real filling goods. In practical use, it is used to examine a wide variety of packaging materials and is often used to verify the results obtained with color inks, creep agents, test gases, etc. Norm: Hausverfahren PV036
Leak tightness/leakage test/pores: Porosity of laqueres on aluminum foil This method is suitable for checking coated aluminum foil for the presence of pores in the lacquer coat. Such pores can lead to dark spots or holes in the aluminum upon contact with acidic fillings by corrosion. The principle of the test is based on chemical copper deposition from a weak acid test solution. Norm: FhG Merkblatt 29 Blatt 1
Leak tightness/ leakage test/ pin holes: test gas method To carry out this test, the sample to be examined is filled via a septum with a small amount of forming gas (a mixture of 95-97% nitrogen and 3-5% hydrogen). Then the package is examined with a detector probe on hydrogen leakages. The method is very sensitive and is suitable for locating very small leaks. However, in the case of filled packages it may com to closure of micro leaks by dried filling good. So that method especially is suitable for examination of empty packs, packs with dry filling goods or accurately cleaned packs. Norm: IVLV Merkblatt No. 102
Leak tightness/leakage test/pores: resistance against leakages Test method for inspecting plastic bags for waste collection by filling them with mains water or a water-sawdust mixture (50v/50v) Norm: DIN EN 13592