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PET containers require special consideration during warm weather in order to prevent shrinkage or distortion occurring after the moulding process is completed.

The process of bi-axially orientating the PET polymer leaves residual stress in the walls of the container, which is then prone to relief if the ambient temperature is raised for any length of time.

The amount of shrinkage will depend upon the actual temperature, the  length of the time and the specific characteristics (stretch ratio) of any given container.


Some general indications are shown below;  


1) Over 50 C - shrinkage occurs in less than 1 hour

2) 42-50 C - shrinkage in less than 12 hours

3) 35-42 C - shrinkage in less than 5 days

4) 30-35 C - shrinkage in less than 20 days


The following recommendations will assist in minimizing this effect;  


i) Carriers should deliver loads directly & avoid unnecessary delays

ii) Light coloured vehicles preferred Ventilated trailers(without windows or panels)

iii) Avoid leaving pallets in direct sunlight during load/unloading

iv) Place pallets into storage away from skylights & heat sources

v) Storage under metal roofs with limited airspace not recommended

vi) Beware of Fork-truck exhaust pipes

vii) Follow GMP for stock rotation

viii) If shipping via container, seek advice from the shipper