Properties of Flexible Packaging Materials
PE = Polyethylene PVC
 = Polyvinyl Chloride
LDPE = Low Density Polyethylene CPP = Cast Polypropylene
LLDPE = Linear Low Density Polyethylene PET
 = Polyethylene Terephthalate
HDPE = High Density Polyethylene BOPP
 = Biaxially Oriented Polypropylene
EVA = Ethylene Vinyl Acetate Copolymer EVOH = Saponified Ethylene Vinylacetate Copolymer
PP = Polypropylene AL = Aluminium Foil
PS
= Polystyrene      

PET Film Properties
Advantages Disadvantages
Clarity (very High) Moisture and gas barrier properties (low)
Heat resistance (very high) Heat seal ability (low)
Cold resistance (high) Alkali resistance (low)
Stiffness (very high) Expensive
Tensile Strength (very high) Toughness (low)
Corona treatment (very high)  
Alcohol barrier properties (very high)  
Acid resistance (very high)  
Flavor barrier property (high)  
Microwavable  

Property of MPET film
Advantages Disadvantage
Gloss (very high) Heat seal ability (no)
Heat resistance (very high) Alkali resistance (low)
Cold resistance (high) Expensive
Stiffness (very high) Toughness (low)
Tensile Strength (very high)  
Alcohol barrier properties (very high)  
Acid resistance (very high)  
Flavor barrier property (high)
  
Moisture barrier properties (very high)  
Gas barrier properties (very high)  
No crack when impacted  

BOPP film Properties
Advantage Disadvantage
Clarity (high) Heat resistance (no)
Stiffness (high) Heat Seal ability (no)
Cold resistance(high) Oxygen barrier properties (O2TR testing)(low)
Moisture barrier properties (WVTR testing)(high) Flavor barrier (low)
Alcohol barrier properties (high) Corona treatment (low)
Acid resistance (very high) Short shelf life
Alkali resistance (very high) Toughness (low)
Low prices  

MOPP Film Properties
Advantages Disadvantage
Clarity (high) Heat resistance (no)
Stiffness (high) Heat seal ability (low)
Cold resistance (high) Corona treatment (low)
Moisture barrier properties (WVTR testing)(very high)
 Short shelf life
Alcohol barrier properties (high)
 Toughness (low)
Acid resistance (very high)  
Alkali resistance (very high)  
Oxygen barrier properties (O2TR testing)(very high)
  
Flavor barrier properties (very high)  

Properties of Nylon Film
Advantage Disadvantage
Clarity (high) Stiffness (low)
Heat resistance (high) Heat seal ability (no)
Cold resistance (very high) Moisture barrier properties (WVTR testing)(low)
Oxygen barrier properties (O2TR testing)(very high)
 Acid resistance (no)
Flavor barrier properties (high)  Alcohol barrier properties (no)
Alkali resistance (high) High price
Toughness (very high)  

MCPP Film Properties
Advantages Disadvantages
Gloss (high) Stiffness (low)
Heat resistance (medium) Cold resistance (no)
Heat seal ability (high) Crack when impacted
Moisture barrier properties (WVTR testing)(high)  
Flavor barrier properties (high)  
Oxygen barrier properties (O2TR testing)(high)  
Acid resistance (high)  
Alkali resistance (high)  
Alcohol barrier properties (high)  

Factors affecting product shelf life

  1. Film structure
  2. Ingredients of the packed products
  3. Environment during the packing process
  4. Seal quality
  5. Film quality

Suitable material structure for each kind of packaging

  1. Food Product
    1. Pet Food for dogs,cats,rabbits,fish,etc.
      • 2 layer
        • Bopp or Bopp(co-ex) // LLdpe
        • Pet // LLdpe , Mcpp
        • Nylon // LLdpe
      • 3 layer
        • BOPP or BOPP (Coex) // Mpet or Alu-Foil // LLDPE
        • PET // MPET , Alu-Foil // LLDPE
        • LLDPE ,CPP for product shelf life not exceeding 3 months
        • MCPP , HDPE for product shelf life not exceeding 3 months
        • MPET for product shelf life not exceeding 1 year
        • Alu-Foil or product shelf life not exceeding 2 year
    2. Seasoning, e.g. Chinese five-spice powder, green curry powder, agar ,etc. 
      • 2 layer
        • Pet // LLdpe, Cpp (ใช้เป็นซองนอก)
        • K-Pet // LLdpe, Cpp
        • Bopp // Cpp, LLdpe
        • K-Bopp // LLdpe, Cpp
        • K-Nylon // LLdpe, Cpp
      • 3 layer
        • Bopp // Mpet or Alu // LLdpe
        • Pet // Mpet or Alu // LLdpe
    3. Powdered milk and instant coffee
      • 2 layer
        • Bopp // LLdpe
        • Pet // LLdpe
        • Nylon // LLdpe
      • 3 layer
        • Bopp // Mpet or Alu // Pe
        • Pet // Mpet or Alu // LLdpe
        • Pet // Mpet or Alu // Pe
  2. Non food Products
    1. Solution, e.g. fabric softener, bathroom cleaner, dish washing liquid etc.
      • 2 ชั้น
        • Pet // LLdpe
        • Nylon // LLdpe
    2. Cosmetics, e.g. hair straightening solution,shampoo conditioner.
      • 2 layer
        • Pet // LLdpe
        • Nylon // LLdpe
      • 3 layer
        • Pet // Alu // LLdpe
        • Nylon // Alu // LLdpe