Parameters Before retort processing After retort processing
12 µm Polyethylene terephthalate (PET) / 9 µm Aluminium foil / 15 µm Nylon / 70 µm Cast Polypropylene
Total thickness μm 110 110
Tensile strength (Machine Direction) kg / cm2 446.58 437.49
Tensile strength (Cross Direction) kg / cm2 358 349
Elongation at break (Machine Direction)% 156 149
Elongation at break (Cross Direction) % 124 112
Tearing strength (Machine Direction) g 116 108
Tearing strength( Cross Direction) g 102 96.0
Seal strength (Top) kg /10mm 3.96 3.78
Seal strength (Side) kg/ 10mm 4.86 4.26
Seal strength (bottom) kg / 10 mm 4.02 3.86
Gas transmission rate (ml/m2/day) <0.021 <0.038
Water vapour rate (gm/m2/day) <0.019 <0.032
Total migration ( mg / kg)
Distilled water 26.0 28.0
3 % Acetic acid 38.0 42.0
50 % Ethyl alcohol 26.0 29.0
n- Heptane 24.0 26.0
Table 1: Physico-mechanical and barrier properties of multi layer laminate retort pouch.