What kind of eraser is used by students made of?

Stationery made of rubber can erase traces of graphite or ink. There are many types of erasers, with different shapes and colors, including ordinary incense erasers, art erasers such as 2b, 4b, and 6b for painting, as well as plastic erasers.

Erasers can erase pencil words and were first discovered by the English scientist Priest in 1770. Before that, people used bread to wipe pencils. Priest's discovery caused a lot of sensation because it brought great convenience to people.

However, the earliest erasers were made of natural rubber, and they did not drop crumbs when erasing words, but just glued the end of the pencil to the eraser, and the more they wiped, the dirtier they became. Later, substances such as sulfur and oil were added to the eraser, which made the eraser easy to peel off, and the scraped pencil end left the eraser with the debris, so that the eraser could always be kept clean and the paper would not stain.

Eraser Word Reason.

The rubber is made of natural rubber or synthetic rubber.

Let's start with the principle of the pencil.

The main component of the pencil is graphite (not lead), which is very soft in nature, and after being baked in the pencil factory, it becomes brittle and hard, and when it is in contact with the paper, the uneven fibers on the surface of the paper will scrape off many cores of the pencil.

Therefore, the pencil will be shorter and shorter;

Some of the graphite that has been scraped off is scattered on the paper in a loose form (so it will get dirty when you touch the paper with your hands).

Others are mixed with paper fibers and stick to the fibers.

And at this moment. The eraser appeared!!

A great eraser produces something one by one (natural rubber or synthetic rubber).

Just like soft noodles, the surface graphite powder is wrapped into the dough.

It also takes away the fibers on the surface of the paper, along with the graphite that sticks to it.

So the paper will be thinner and thinner the more you rub it).

It's also less easy to clean.

Generally, polyethylene-based erasers will add some additives during production, and carbon dioxide, water, chloride, sulfide and other chlorides will be produced when burned, and sulfides are harmful to the human body.

Erasers are made of rubber or plastic, sulfur, vegetable oil, and gravel materials. There are many types of erasers, and erasers similar to the tail of a 2B pencil are very common, with a gelatinous surface, and should not be used with excessive force. The art eraser is made of rubber, which can erase traces over a large area, but the erasing effect is slightly worse.

Erasers are made of rubber or plastic, sulfur, vegetable oil, and gravel materials. There are many types of erasers, and erasers similar to the tail of a 2B pencil are very common, with a gelatinous surface, and should not be used with excessive force. The art eraser is made of rubber, which can erase traces over a large area, but the erasing effect is slightly worse.

<>1. Erasers are stationery made of rubber, which can erase the traces of graphite or ink, and the main raw materials are rubber or plastic, sulfur, vegetable oil, and gravel.

2. Rubber: a high-elasticity polyshed complex material with reversible deformation. It is elastic at room temperature, can produce large deformation under the action of small external force, and can return to its original state after removing external force, and does not conduct electricity.

Rubber is a completely amorphous polymer, and the main component of plastic raw materials is resin. Chain macros.

3. The working principle of the eraser is to use the force between the rubber molecules and other substance molecules, and the rubber itself is soft and does not damage the paper.