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In one of the most encompassing such BAN in the U.S. , San Francisco late voted to outlaw commonly used foam products due to their environmental impact .
The city ’s control board of supervisors nem con voted last week ( June 28 ) to ban expanded polystyrene , the foam , petroleum - base plastic used in food packaging , packing Arachis hypogaea , coffee cups and more . The ordination , which goes into impression next twelvemonth , is an extension of a 2007 ban of take - out nutrient container made of the foam , and is another step toward the city ’s finish to achieve zero waste .
Foam packaging used for food containers, packing peanuts and more, was recently banned in San Francisco.
Though such froth products are often conversationally referred to as Styrofoam , San Francisco ’s ban does not apply to trademarked Styrofoam — used in grammatical construction , housing detachment and some other product — which is an extruded board of polystyrene and not the blow up polystyrene being ban . [ Bubbly skill : pose How Foam Behaves | Video ]
What is expanded polystyrene?
To make expand polystyrene ( EPS ) , engineers surround tiny gas bubbles with polystyrene , resulting in thisfoam - like material , according to Rick Sachleben , a member of the American Chemical Society ’s panel of experts . EPS became popular because it is sleazy and well-heeled to make , has isolate properties , and is lightweight and waterproof .
But , as jockstrap of San Francisco ’s ban noted , the materialdoes not biodegradewell , taking tenner , perhaps generations , to whole take down .
" Because it ’s a synthetic charge card , it ’s slower to break down in the surroundings , " Sachleben told Live Science . " If it gets into the environment , it gasconade around , it floats , it gets out there and it goes aside slowly — really slowly . "
And the cloth does often end upin the environment , Sachleben said .
Because EPS products are ordinarily used in food containers , these materials often get contaminated with waste , compelling hoi polloi to have the foam away rather than recycle it . Or , people do not dispose of the items in designated bins , rather throw them on the side of the road aslitter , where they can disperse into the environment .
Recycling foam
Though EPS is entirely recyclable , a few factors make it difficult to break down and recycle the material .
One of the mostexpensive vista of recyclingis moving a material from the post where it is used or dispose of to the recycling location . For a lightweight Cartesian product like EPS , this is even more dearly-won , said Eric Beckman , a polymer scientist and George Bevier Professor of Engineering at the University of Pittsburgh .
" This is where its strength is make out back to haunt it , because it ’s mostly made of melody , " Beckman told Live Science . " If you ’re trying to embark it to a place to recycle , you ’re filling up a truck with mostly zephyr and paying to move it around , and that just does n’t form very well economically . "
equate with the EPS used in cups and food containers , promotion EPS can more easily be recycled , Sachleben pronounce . That ’s because it ’s large and bulky enough to make the costly transport worthwhile , he read . recycle companiescan reveal up these larger EPS materials and use the trivial beads it ’s broken into to make fresh stuff .
What next?
For San Francisco , the dubiousness remains : What willreplace the foamproducts ?
Beckman noted the most difficult aspect of replacing one ware with another is that there are often business deal - offs .
The life cycle of a product need to be taken into considerateness , from " what it take to make , what happens as you use it and what happen to it at the remainder of life , " Beckman said .
" It ’s potential that in set about to do away with polystyrene and extinguish the end - of - life problems that EPS has , the great unwashed could supplant it with something that ’s actually worse , which has high impacts when you make it , " Beckman explained . " In other words , you could make something that degrades attractively in the surroundings , but it has so many encroachment when you manufacture and channel it that the net effect is in reality worse . "
Original article onLive Science .
