Cosmetic package leak testing is to test integrated performance to avoid external migration into package & content leakage. Commonly used testing methods are as follows

• Underwater Decompression Method: Take Labthink MFY-01 Leak Tester as example, this leak tester is made according to underwater decompression method. Testing procedure is: put proper amount of distilled water in vacuum chamber, and immerge specimen completely into the chamber. Set vacuum pressure and time, start test. Tester will begin vacuumizing the chamber to form inner-out pressure difference for immerged specimen. Observe gas leakage of the specimen and determine sealablity of the specimen.
  
  MFY-01 Leak Tester conforms to ASTM D3078
  
  Technical Specifications
  

  Items	Specifications
  Vacuum Degree	0 ~ -90 KPa
  Accuracy	1% of reading value
  Vacuum Chamber Effective Sizes	Φ270 mm x 210 mm (H) (standard)
  	Φ360 mm x 585 mm (H) (optional)
  	Φ460 mm x 330 mm (H) (optional)
  	Note: customization is available for other sizes

  
  
  
• Positive Pressure Testing method: Take Labthink LSSD-01 Leak and Seal Strength Detector as example. This tester applies positive pressure testing method. Through pressure exertion into inner package to test compression resistance, sealing performance and leak index so as to achieve integration and seal strength testing.
  
  Technical Specifications
  
  

  Items	Specifications
  Test Range	0~600 KPa; 0~87.0 psi (standard)
  	0~1.6 MPa; 0~232.1 psi (optional)
  Gas Injection Head	Φ10 mm (standard)
  	Φ4 mm, Φ1.6 mm (optional)
  Air Source Pressure	0.4 MPa~0.9 MPa (not in supply scope)
  Port Size	Φ8 mm PU Tubing
  Instrument Size	300 mm (L) x 310 mm (W) x 180 mm (H)