Barrier Properties of Films

When it comes to choosing the right structure of laminates for your product it is important to take a look at the barrier & functional properties of various commonly used packaging films.

For instance in the below table aluminium foil scores 10 out of 10 in all parameters determining the shelf life of products which clearly suggests that any laminate structure involving aluminium foil as one of the layer will be best in terms of barrier properties and shelf life of the product.

MATERIAL

WATER VAPOUR

GAS BARRIER

ODOUR BARRIER

WATER RESISTANCE

OIL RESISTANCE

Aluminium Foil 0.009mm

*10

*10

*10

*10

*10

Polythene (LDPE)

7

3

3

10

5

Polyester

4

5

8

10

8

PE Coated Paper

7

3

3

6

5

Waxed Paper

5

2

2

8

5

PVDC Coated Paper

8

8

8

6

8

COMPARISION OF TRANSMISSION RATES FOR VARIOUS FLEXIBLE PACKAGING MATERIAL

Material

MVTR

OTR*

 

g/m2 24 hrs
38°C 
90% rh 

cc/m2 24 hrs
at atmospheric temperature
and pressure

Polyester Film / Aluminium Foil/ LDPE Film Laminates

less than 0.01

less than 0.006

12 Micron Metallised Polyester Film

0.7 to 2.0

2.0

12 Micron Metallised PET/ Adhesive / 50 Mic LPDE Film

0.4

0.6

Polyester Film (12 Micron)

40

105

BOPP Film (12 Micron)

355

42

CPP Film (30 Micron)

11

4800

LDPE Film

18

8000

MVTR: Moisture Vapour Transmission Rate g/m2 over a period of 24 hrs
OTR: Oxygen Transmission Rate