Aluminium foil is a type of primary packaging material. It is directly connected to the drug. It is coated with HSL/VMCH. The other side is printed with different types of ink. Aluminium foil testing depends on which coating type is on the coating side. the testing method was applied according to his coating type on aluminium foil. this foil used as lidding foil
HSL (Heat Seal Lacquer): This is a type of coating applied to aluminum foil to enable heat sealing. It’s used to seal the foil to itself or other materials (such as plastic or paper) in packaging applications. Heat sealing is a common method for closing packages securely.
VMCH (Vinylidene Chloride Vinyl Chloride Copolymer): This VMCH resin type is often used as a barrier coating in aluminum foil laminates. It provides excellent oxygen and moisture barrier properties, making it suitable for packaging applications where protection against these elements is crucial. VMCH coatings help extend product shelf life by preventing spoilage caused by oxygen and moisture.
Here are some Aluminium Foil testing method parameters we discussed
Table of Contents
1. Description:
we physically verify whether aluminum foil is printed or unprinted. Types of coating HSL or VMCH coating. In printed aluminium foil visually check the test matter is printed without any bladdering is required. Printed aluminium foil is visible at the eye point. the thin aluminium layer is laminated with HSL(heat seal lacquer) or VMCH ( vinyl chloride,vinyl chloride, vinyl acetate, and Maleic Acid).
2. Text matter:
Test matter is compared with a standard shade card or artwork, In this testing the quality of the print inspection of aluminium foil. The printed foil is printed with different Pantone color text matter.
3. Color Scheme:
The aluminium foil is printed then, testing the text matter of the color scheme match with the shade card or Pantone card
4. Width:
The aluminium foil tests the foil width with the help of a measuring scale. the selected sample measure the width and note the reading.
5. Inner core diameter:
the aluminium foil is in a roll form. The roll’s inner core diameter can be tested with the help of a measuring scale. take the reading of the selected sample and note down the reading.
6. Identification of aluminium:
- chemical method
The chemical method of aluminium foil take the sample Weight the aluminium foil 15 mg sample put it in a beaker mix 30ml 1NHCL then heat it on the hot plate. the beaker aluminium foil to dissolve, in solution, add about 0.5 ml conc HCL and thioacetamide regents, no precipitate is formed, add dropwise NaoH solution and a gelatinous white precipitate is formed which dissolves on further addition of 1NaoH Solution after gradually addition ammonium hydroxide solution .gelatinous white precipitate is re-formed.
- IDENTIFICATION BY FTIR:
The identification test of the Foil Sample, this testing is performed with the help of the FTIR Instrument. In this foil identification test HSL Layer, first of fall, we platted the graph of Zeon reference standard, then after scanning the sample of HSL Layer sample. Both reference standards and the HSL Layer sample plotted the graph at 3800-650 cm-1 by the FTIR Instrument.
The spectrum of the specimen exhibits major absorption bands only at the same wavelength as the spectrum of the HSL Layer sample and Zeon reference standard.
7. Grammage:
- Total Grammage:
The sample of Aluminium foil of Grammage testing is performed, cut the sample 10 x10 cm or 5 x 5 cm with the help of a GSM Plate. For printing foil with a cotton Rubbing mix of ethyl acetate on the printed side, carefully not contact with the coating side. Dry at room temperature. And then weighing the sample at analytical balance, the Grammage calculation by the given formula
Total Grammage = weight in grams x 100 or 400 (if the sample cut 10 x 10 cm or 5 x 5 cm)
- For Aluminium Layer:
The sample of total Grammage was completely dipped in a glass beaker containing ethyl acetate. After some time with a cotton Rubbing mix of ethyl acetate on the coating side. The aluminium layer is separated from the aluminium. Dry room temperature the aluminium layer, the weight of the sample weight on an analytical balance calculated the Grammage by the given formula,
Aluminium layer Grammage = weight in grams x 100 or 400 (if the sample cut 10 x 10 cm or 5 x 5 cm)
- For HSL/VMCH Layer
HSL/VMCH Layer = Total Grammage- Aluminium layer Grammage
8. Thickness:
The aluminium layer takes the sample of the “aluminium layer grammage”. measure the thickness of the aluminium layer with the help of a digital micrometer. take the reading of the aluminium layer and note down the reading.
9. Pinhole test for aluminium foil
The pinhole testing of the sample of Aluminium foil testing foil of illuminated magnifier tester instrument. When the sample is put on the bench of the pinhole tester, the background light is identified as the hole in the Foil sample. It visually checks the sample and does not have any holes. The test identified that the sample had no holes.
I am Maneesh Maurya a professional pharmaceutical blogger from India having rich experience in the pharmaceutical Quality control field.
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