Wednesday, May 12, 2021

Plastic | Types of Plastic |


Hello friends, 
Today, We'll discuss Plastic & its types. Hopefully, you'll understand this topic.
First of all, thanks for visiting.
Now, below topics that we are covering today.


The plastic term is derived from the Greek word 'Plastikos' which means "Fit for molding". It is a polymer that is a carbon chain of many monomers. The monomer is a single element. 

Note: All plastic is the polymer and not all the polymers are plastic because other metal is also made up of polymer. For example Iron.



There are two types of Plastic.
  1. Thermoplastic
  2. Thermoset

1. Thermoplastic: 

That plastic is solid at normal temperature. But it becomes soft when heated. That is, when we heat it, it becomes soft and when cooled again, it takes solid form. 
Thermoplastic can be remelted and reused. It can be recycled easily.
For example- PS, PE, PP, PC, HDPE, ABS, etc.

2. Thermoset: 

That plastic that can't be melted again and reused. Once it melted in any form and again when trying to melt, degrade the material. Its physical strength is high. Due to high insulation, it is used to make electric appliances. It is adhesive therefore it is used for making fevicol and plastic paint.
For example- PF, Epoxy resin, Bakelite, Melamine, etc.


PE (Polyethylene): 

By a scientist named Singler, high-density polyethylene was identified by identifying the hazards found in the lime system and using a special catalyst to extract a new technique for preparing polyethylene from ethylene air at low pressure and temperature. The new plastic had more features than the previously made plastic. Research got a new direction due to this plastic. It was first produced in India in 1961.

Polyethylene is of two types:
  1. Heavy polyethylene
  2. Light polyethylene

Physical properties: 

  • Colour: It is white-colored & transparent.
  • Density: Its density is up to 0.915 to 0.930 gm/cc. Due to its density being less than water, it floats in water, Which means, there is no effect of water on it. 
  • On applying to heat: It becomes soft in boiling water. It remains flexible up to 70°C.
  • Light: There is a slight effect after some time.
  • Electricity: It is a very good electrical insulator.
  • Weather & Climate: There is no special effect. 

HDPE (High-Density Polyethylene):

HDPE (High-Density Polyethylene) materials have a linear structure in shape. Its density is lies between 0.95 to 0.97 gm/cc. These are high crystallinity and are 80% to 90%. The softening temperature point for this material is 135°C. HDPE materials are stiff and hard.

Linear structure
Linear chain

LDPE (Low-Density Polyethylene): 

LDPE (Low-Density Polyethylene) materials have branched structures in shape. Its density is lies between 0.91 to 0.925 gm/cc. These are low crystallinity and which is 50%. The softening temperature point for LDPE is 115°C. This material is tough and flexible.

Branched structure

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