Manmade Materials and Their Properties

These flashcards cover important concepts and properties of manmade materials discussed in the lecture notes.

Plastic is a manmade material made up of __________.

organic polymers.

Thermoplastic can be molded as per our wish and includes examples like __________ and __________.

Polythene, PVC.

Once a specific shape is given to thermosetting plastic, it __________.

cannot be changed on heating.

Plastic is __________ in weight, which makes it easy to carry.

light.

Thermocol is a form of __________ that can be used for packing.

polystyrene.

The degradation period for plastic is __________.

thousands of years.

An example of a thermosetting plastic is __________.

Bakelite.

Polyvinyl chloride (PVC) is used to make __________, __________, and __________.

bottles, raincoats, pipes.

Glass is a __________ material that is formed from a mixture of silica and silicate.

non-crystalline.

Soda-lime glass requires the mixture to be heated to __________ degrees Celsius.

1500 ºC.

Items made from __________ glass show minimum expansion on heating.

silica.

Borosilicate glass is used in the __________ industry for storing medicines.

pharmaceutical.

Lead glass is commonly used in manufacturing __________ and __________.

light bulbs, tubes.

Glass can be affected by the presence of __________ in its composition.

oxides of chromium, vanadium, or iron.

The term for using plastic resources by reducing, reusing, and recycling is known as the __________ principle.

4R.

Thermocol, while effective for packing, releases __________ gases when burned.

poisonous.

An item that can substitute plastic to be more environmentally friendly is __________.

jute bags.