22/05/2026
Polyethylene (PE) 🧊 vs Polypropylene (PP) 💠
Both are widely used common plastic polymers, yet they differ greatly in physical properties and practical applications.
🧬 Structural Difference
Polyethylene (PE)
Simple carbon chain combined with hydrogen elements ✨
Polypropylene (PP)
Carbon chain structure with an extra methyl group 💎
This special methyl group endows PP with these traits
• More rigid texture
• Better heat resistance
• Higher overall stiffness
🌡 Temperature Resistance
• LDPE melting point: 105–115°C
• HDPE melting point: 120–135°C
• PP melting point: 160–170°C
💡 PP can bear much higher temperature compared with PE
⚙ Mechanical Properties
Impact strength
PE performs excellently, PP shows good performance
Stiffness
PE has low stiffness, PP owns high stiffness
Flexibility
PE features great flexibility, PP keeps moderate flexibility
Fatigue resistance
PE reaches medium level, PP has outstanding fatigue resistance
Applicable usage scenes
🔹 PP is ideal for making hinges, rigid packaging and high-speed CPP film
🔹 PE suits soft films, stretch film and flexible packaging production
🎞 Film Application Difference
🧩 PE Film Uses
Applied to stretch film, blown film, shopping bags, milk packaging and shrink film
Main PE categories: LDPE, LLDPE, HDPE
🧩 PP Film Uses
Widely used in CPP film, BOPP film, daily food packaging, high-temperature retort packaging and metallized film
Main PP categories: Homo PP, Random copolymer, Impact copolymer
📽 CPP Film Perspective
Why PP material is adopted for CPP film
