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Terephthalic acid is an organic compound that scientists use to make polyester.

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Polyester makes up the backing of the artificial turf. The foam layer of turf is made of polyester. Polyester is in turf, so if you fall the foam layer will make it a little more comfortable, unlike falling on concrete.

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Polyester foam is also known as ester is an open celled type of foam that is used as the under layer of turf

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This bottom layer is there so it makes it feel like you're running on natural grass and not just concrete. This is more of a comfort part of the turf.

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Nylon is used for all those little blades of artificial grass that is seen on turf to make it more realistic.

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These fibers are what sit onto of the foam layer so it looks like actual grass. This is the main part of artificial turf.

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This is the final result of when you take all those elements and put them together. It makes Artificial Turf.

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https://www.health.ny.gov/environmental/outdoors/synthetic_turf/crumb-rubber_infilled/fact_sheet.htm#:~:text=One%20type%20of%20synthetic%20turf,connected%20to%20a%20backing%20material.

http://www.madehow.com/Volume-7/Artificial-Turf.html

https://www.nj.gov/health/ceohs/documents/eohap/haz_sites/regional_state/art_turf/other_concerns.pdf