How is plasticizer lost?
The rate of loss of plasticizer depends on plasticizer type, temperature, sheet thickness, environment and exposure time. The actual mechanism behind this loss is migration of plasticizer from the surface membrane. Plasticizers can migrate from PVC geomembranes over time because of contact with air, liquid and an absorbent sold material Plasticizer loss reduces the flexability of PVC geomembranes and in extreme cases results in noticeable shrinkage. [See photo below] The constant use of bleach on vinyl fabric will rob the plasticizer and make the fabric stiff.
