A. Power of adhesion test
- Regent 2% sodium hydroxide
- Selected five samples of Aluminium tube
- Prepare 2 % NaOH Solution
- Fold the open end of the tube to cover the uncoated portion and immerse the tube in the solution for 15 minutes the tube along with the water to remove the alkaline solution.
- No blistering or loosing of external decoration or bleeding of coating or ink should be found
B. Flexibility test
- Selected five samples of Aluminium tube
- Take a sample cut it in the open end and make it a flat sample
- The external surface is on the outside.
- Sharpen the fold by passing it between the finger and fingernail.
- Repeat the procedure 3 times at different places on the tube
- The result the external surface coating must not peel off when the sharpened fold is rubbed with the fingers & fingernail.
I am Maneesh Maurya a professional pharmaceutical blogger from India having rich experience in the pharmaceutical Quality control field.
