- Selected sample of VMCH-Coated Aluminium foil 10 x 10 cm or 5 X 5 cm is suitable with the help of GSM Plate. Weight the sample at analytical balance.
- Total Grammage = weight in gram x 100 or 400( if the sample is cut 10 x 10 cm or 5 x 5 cm)
- Dip cotton or clean cloth in ethyl acetate and rub on the VMCH-Coating layer until the VMCH is removed. After some time, the sample was dried at room temperature. Then take weight on analytical balance.
- Grammage of aluminium layer = weight in gram x 100 or 400 (if the sample cut 10 x 10 cm or 5 x 5 cm)
- Grammage of VMCH Layer = total Grammage- Grammage of the aluminium layer
OR
- Take a sample of total Grammage, Make a solution of 10% NaoH. Dip the sample in its solution after some time, and the aluminium layer dissolved. The remaining layers are found in the VMCH Layer. Dry it at room temperature and after taking the weight sample
- Grammage VMCH layer = weight in gram x 100 or 400 (if the sample cut 10 x 10 cm or 5 x 5 cm)
Mainly the VMCH layer Grammage is 4 to 6 grams/m2
more information about to full testing of VMCH/HSL Coated aluminium foil
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