Because the lid usually has to bend to get it off. If if is too rigid,it will soon break.
Ceramics are made from clay while plastics are made from petroleum(oil). Ceramics are opaque while plastics can be made transparent, translucent or opaque.
Examples of thermosetting plastics (or just thermosets) include amino, epoxy, and phenolic and unsaturated polyesters.
Because plasitc have a basic structure they can be put into groups. plastics are made up of oil extracts and cemical compounds. the real anwser is plastics contain things called "polymers" with makes the "p" in their names.hope this help you guys out. :D
Valves are made from metals, including brass, bronze, iron, steel, and alloys, as well as from plastics.
The raw feedstock for a lot of polymers is indeed petroleum.
No, it's made out of different metals and plastics.
Metals and plastics in different forms ODD QUESTION ?
They are mainly made of different types of polyester or nylon.
on a molecular level they are different. the polymers they are made up of have different shapes
There are many different kinds of fittings. Traditional fittings are brass or bronze, nowadays they are made from many different and excellent plastics. The plastics, of course are much cheaper.
Many plastics are.
Different plastics, most are proving better than metal.
Mainly different types of steel, and some plastics.
cream youget
the plastics which are used are mostly very strong, light and sturdy because of the particles and polymers in the plastic itself.
Car door panels may be made of a number of different materials. Most of these panels are made from metal or plastics.
The balloon itself is made out of a blend of plastics the stuff is inside is H2O- this means that on the molecular level there are two hydrogen atoms and one oxygen atom.