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| [[w:List of materials properties|Materials have many properties]] which effect which material is most suitable for which use. | | [[w:List of materials properties|Materials have many properties]] which effect which material is most suitable for which use. |
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| [[w:Materials science]] is the design and discovery of new materials, particularly solids.
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| [[w:Timeline of materials technology]]
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| = Biodegradable waste = | | = Biodegradable waste = |
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| = Plastics = | | = Plastics = |
| '''[[w:Plastics]]''' are made from petroleum or recycled plastic.
| | Plastics are made from oil or recycled plastic. |
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| == Information about plastics on Wikipedia ==
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| * [[w:Plastic container]]
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| * [[w:Plastic pollution]]
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| == Recycling plastics == | | == Recycling plastics == |
| '''[[w:Plastic recycling|Plastic recycling article on Wikipedia]]''' | | '''[[w:Plastic recycling]]''' |
| | | * Many types of plastic can be recycled to make plastic. |
| Advanced countries have '''[[w:Container-deposit legislation|deposit-refund systems]]''' for efficient plastic (and aluminum) recovery.
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| * Most types of plastic can be recycled to make plastic. PVC, marked with code '03' is not welcome in the plastic recycling bin. | |
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| <div class="thumb tright">
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| <div style="width:400px;">
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| [[File:Symbol Resin Code 1 PETE.svg|50px|1-PETE]]
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| [[File:Symbol Resin Code 2 HDPE.svg|50px|2–HDPE]]
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| [[File:Symbol Resin Code 3 V.svg|50px|3-PVC]]
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| [[File:Symbol Resin Code 4 LDPE.svg|50px|4-LDPE]]
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| [[File:Symbol Resin Code 5 PP.svg|50px|5-PP]]
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| [[File:Symbol Resin Code 6 PS.svg|50px|6-PS]]
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| [[File:Symbol Resin Code 7 OTHER.svg|50px|7-Other]]
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| <div class="thumbcaption">Plastics type marks: the [[w:resin identification code]]<ref>[http://www.plasticsindustry.org/AboutPlastics/content.cfm?ItemNumber=823&navItemNumber=2144 SPI Resin Identification Code – Guide to Correct Use] {{webarchive|url=https://web.archive.org/web/20120321142801/http://www.plasticsindustry.org/AboutPlastics/content.cfm?ItemNumber=823&navItemNumber=2144 |date=2012-03-21 }}. plasticsindustry.org</ref> </div>
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| </div>
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| </div>
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| ''' What plastics should be recycled? '''
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| In Finland the following rules of thumb have been given: You should put the plastic into a recycling bin if the three following conditions are met: <ref name="HS2018-10-26">https://www.hs.fi/kotimaa/art-2000005877189.html</ref>
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| # If the packaging (visually inspected) contains more that 50% plastic
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| # If the packaging does not contain dangerous substances and
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| # If the packaging is not made of PVC (marked with sign '03')
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| * As of 2018 in Finland the demand for recycled plastic exceeds the amount being recycled.<ref name="HS2018-10-26"/>
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| ''' Links to information about recycling plastics ''' | | ''' Links to information about recycling plastics ''' |
| * [https://www.bbc.com/news/uk-42703561 Plastic recycling: Your questions answered at BBC.com] | | * [https://www.bbc.com/news/uk-42703561 Plastic recycling: Your questions answered at BBC.com] |
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| === PET recycling ===
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| [[File:Symbol Resin Code 1 PETE.svg|100px|1-PETE]]
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| '''[[w:Polyethylene terephthalate]]''' ('''PET''' or '''PETE''') is the most common type of plastic.
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| * [[w:PET bottle recycling]]
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| * [[w:Polyethylene terephthalate#Polyester recycling industry|Polyester terephalate recycling industry in the Wikipedia article on Polyethylene terephthalate]]
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| * '''PET''' '''Co'''ntainer '''R'''ecycling '''E'''urope, commonly known as '''[[w:Petcore]]''', is a Brussels-based non-profit European trade association.
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| === HDPE recycling ===
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| [[File:Symbol Resin Code 2 HDPE.svg|100px|2–HDPE]]
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| '''[[w:High-density polyethylene]]''' ('''HDPE''')
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| === PVC recycling ===
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| [[File:Symbol Resin Code 3 V.svg|100px|3-PVC|PVC]]
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| '''[[w:Polyvinyl chloride]]''' ('''PVC''') is not accepted in normal consumer plastics recycling bins. But industrial PVC waste may be reprocessed.
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| '''[[w:Polyvinyl chloride#Sustainability|Wikipedia on sustainability of PVC]]''' states that recycled PVC is broken down into small chips, impurities removed, and the product refined to make pure white PVC. It can be recycled roughly '''seven times''' and has a lifespan of around '''140 years'''.
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| Another method is the '''[[w:VinyLoop]]''', a proprietary physical plastic recycling process for polyvinyl chloride (PVC). It is based on dissolution in order to separate PVC from other materials or impurities. The solvent is in a closed loop, hence the name.
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| === LDPE recycling ===
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| [[File:Symbol Resin Code 4 LDPE.svg|100px|4-LDPE]]
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| '''[[w:Low-density polyethylene]]''' ('''LDPE''') is the material that most [[w:plastic bag]]s are made of. The [[w:Plastic_bag#Environmental_issues|Wikipedia article on plastic bags, section "Environmental issues"]] states that many recycling plants don't process LDPE.
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| === PP recycling ===
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| [[File:Symbol Resin Code 5 PP.svg|100px|5-PP]]
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| '''[[w:Polypropylene]]''' ('''PP''') can be recycled.
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| === PS recycling ===
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| [[File:Symbol Resin Code 6 PS.svg|100px|6-PS]]
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| '''[[w:Polystyrene]]''' ('''PS''')
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| [[w:Polystyrene#Recycling|Wikipedia on Polystyrene recycling]] states that it is generally not accepted in [[w:curbside collection]] due to the lack of recycling companies incentives to invest in compactors. An exception is [[Germany]] where PS is collected due to the packaging law (Verpackungsverordnung) that requires manufacturers to take responsibility for recycling or disposing of any packaging material they sell.
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| = See also = | | = See also = |
| * [[Energy]] | | * [[Energy]] |
| * [[Material input per service unit]] can be used to measure [[eco-efficiency]] | | * [[Material input per service unit]] can be used to measure [[eco-efficiency]] |