- Selected sample of Heat Seal Lacquer Coated Aluminium foil 10 x 10 cm or 5 x 5 cm 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 HSL Coating layer until the HSL is removed. After some time, the sample was dried at room temperature. Then take weight on analytical balance.
- Grammage of alum layer = weight in gram x 100 ( if the sample is cut 10 x 10 cm or 5 x 5 cm)
- Grammage of HSL Layer = total Grammage- Grammage of the aluminium layer
OR
- 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 HSL Layer. Dry it at room temperature and after taking the weight sample
- Grammage HSL layer = weight in gram x 100 or 400 ( if the sample is cut 10 x 10 cm or 5 x 5 cm)
Mainly the HEAT SEAL Lacquere layer Grammage is 6 to 8 grams/m2
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