Published on 20/10/2011
In order to make sorting and recycling easier, the plastic materials have been categorized in seven types based on its properties and applications. Some recycling standards marking codes have been developed which are universally accepted to help consumers identify and sort the main types of plastic. The symbols defined by society of the Plastic Industry (SPI) USA and available in the IS 14535:1998 of BIS are shown in table 4:
Table 1: CATEGORIZATION OF PLASTICS
Source: IS 14535: 1998 & ICPE Newsletter, Vol. 6, Issue 2, Apr- Jan 2005.
This table shows the types of typical thermoplastic and thermosetting resins:
Table 3: TYPICAL THERMOPLASTIC AND THERMOSETTING RESINS
|S.No.||THERMO PLASTIC||S.No.||THERMOSET PLASTIC|
|1.||Polyethylene Tetraphthalate (PET)||1.||Bakelite|
|3.||Poly Vinyl Acetate (PVA)||3.||Melamine|
|4.||Poly Vinyl Chloride (PVC)||4.||Polyester|
|6.||Low Density Polyethylene (LDPE)||6.||Urea – Formaldehyde|
|7.||High Density Polyethylene (HDPE)|
Source: Central Pollution Control Board
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