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Maintaining the Integrity of PET Packaging: Essential Storage Tips

Polyethylene Terephthalate (PET) is renowned for its robustness and versatility in packaging applications. Known for being virtually shatterproof, PET also boasts a high strength-to-weight ratio and excellent resistance to water and organic materials, making it ideal for a variety of products. However, maintaining the quality and safety of PET products requires careful handling, particularly when it comes to temperature management.

Understanding PET’s Thermal Sensitivity

PET’s structure makes it sensitive to heat, leading to potential distortion and shrinkage if not stored properly. The degree of shrinkage depends on several factors including the temperature, duration of exposure, and the specific properties of the PET container. Here’s what you should know about PET’s reaction to heat:

  • Above 50°C: Expect shrinkage to occur in less than one hour.
  • Between 42°C and 50°C: Shrinkage happens in under 12 hours.
  • Between 35°C and 42°C: Shrinkage occurs within 5 days.
  • Between 30°C and 35°C: Takes up to 20 days for shrinkage to occur.

Best Practices for Storing and Transporting PET Products

To ensure the longevity and safety of your PET products, consider the following guidelines:

  1. Consultation During Shipping: Always consult with your shipper if transporting via container to understand the best practices and precautions.
  2. Direct Delivery: Encourage carriers to deliver loads directly to avoid delays which could expose PET products to harmful conditions.
  3. Optimal Transportation Conditions: Use light-coloured or ventilated trailers to minimise heat build-up.
  4. Immediate Unloading: Unload pallets promptly to reduce the risk of exposure to high temperatures.
  5. Avoid Direct Sunlight: Never leave PET pallets in direct sunlight, especially during loading and unloading.
  6. Proper Storage Setup: Store away from skylights and direct heat sources. Avoid placing under metal roofs with limited air space.
  7. Temperature Control: Keep storage temperatures below 35°C to prevent damage and maintain product integrity.
  8. Distance from Heat Sources: Ensure that PET products are stored away from external heat sources like motor exhausts or warehouse heaters.
  9. Stock Rotation: Implement and adhere to good manufacturing practices for rotating stock to ensure freshness and quality.


By following these guidelines, brands can safeguard their PET-packaged products from temperature-induced damage, ensuring that they remain safe and effective for consumer use. Adhering to these practices not only helps in maintaining product integrity but also enhances consumer trust in your brand’s commitment to quality and safety.