Core Advantages and Disadvantages of CPP (Cast Polypropylene) Film

Core Advantages

1. Strong Heat-sealability: Features a wide heat-sealing temperature range, high sealing strength and stable sealing performance. Suitable for use as the inner layer of composite packaging, and compatible with hot-fill and retort pouches.
2. Excellent Optical Properties & Flexibility: Boasts a light transmittance of ≥90% and low haze; flexible for easy lamination, resistant to wrinkling, and amenable to die-cutting and composite processing.
3. Good Temperature & Chemical Resistance: Withstands temperatures ranging from approximately -20℃ to 150℃, resists acids, alkalis and grease, making it suitable for food and electronic applications.
4. Safety & Environmental Friendliness: Non-toxic and odorless, can be in direct contact with food; highly recyclable, and only produces CO₂ and H₂O without halogens when incinerated.
5. Cost-effectiveness: Offers low raw material and processing costs, along with high cost performance, ideal for mass application.

Main Disadvantages

1. Low Surface Hardness: Unmodified CPP film has poor scratch resistance. A hardened coating is required for electronic applications, which increases both cost and processing complexity.
2. Limited Barrier Properties: Has moderate oxygen and moisture barrier performance. It cannot meet long-term fresh-keeping requirements when used alone, and is often combined with PET film or aluminum foil in composite structures.
3. Relatively High Heat Shrinkage Rate: Exhibits significant shrinkage at high temperatures (up to 5% at 170℃), which impairs precision lamination and necessitates formula and process optimization.
4. Brittleness at Low Temperatures: Tensile toughness decreases below 0℃, making the film prone to cracking during transportation or storage in frigid conditions, thus limiting its use in some low-temperature scenarios.