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What are the disadvantages of PLA?

A major consideration about using PLA is the price. PLA is more expensive than other plastics that are fossil-fuel based products. Potential users reconsider the economics of using it over other materials rather than the helpful impact it has on the environment. 
The agricultural impact must also be taken into consideration during the raw materials gathering process of making PLA. Overuse of fertilizers and GMO (genetically modified organisms), in addition to the potential clearing of natural habitats to make way for crop fields may result in more bad than good for the environment at large.
There is concern that PLA may be unsuitable for high temperature applications. On especially hot summer days PLA products have shown signs of deforming when in prolonged contact with direct sunlight. 
Because PLA is made of organic materials, it has higher permeability than other plastics. Moisture and oxygen will possibly be able to penetrate through PLA.  That leads to food spoilage, so it’s not advised to use PLA for long-term storage of food products.
At the end of its life cycle, PLA can be composted, however this compost is specialized and needs to be done in a controlled commercial environment. That requires an additional investment to the process. 
The compost also adds no nutritional value to the soil, as once it is processed, it becomes inert and the beneficial organic properties of its natural components are lost. 
Another issue is that of recycling. As PLA has a lower melting point than other plastics and cannot be recycled together. That doesn’t allow for economically viable recycling methods and may end up costing more to recycle per unit.

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