Put a table tennis ball on the table, press the racket on the ball, and then lift it quickly. At this time, if the ball feels lifted, it means that the rubber is good. This kind of rubber has high friction and is easy to rotate.

Second, it can be analyzed from three aspects: bottom plate, sponge and rubber:

1, bottom plate:

When looking at the quality of the bottom plate, first look at whether the bottom plate is flat or not. You can put the bottom plate flat on the glass plate, and gently click on the top, bottom, left and right parts with your fingers to see if the bottom plate is shaking. If the shaking is large, it means that the bottom plate is uneven and it is an unqualified product. If there is a slight shaking, it is normal.

Secondly, hold the handle with one hand, bend the index finger of the other hand, and pat all parts of the bottom plate with your knuckles (with even force). If the sound is basically the same, it means that the elasticity is uniform; If the sound difference is large, the elasticity is uneven.

2. Sponge:

First look at the appearance of the sponge to see if there are obvious holes or impurities, and then press down with the middle finger. Generally, the sponge with hard touch hits the ball faster, but the speed is slower. But no matter how hard and soft it is, the finger should have a certain sense of rebound when pressed. If there is no such feeling, it means that the quality of this sponge is poor.

3. Rubber:

First of all, it depends on whether the color is pure and bright, and whether the color is uniform. Secondly, check whether the pattern on the tooth particles is clear, and whether the size and row spacing of the tooth particles are uniform; Anti-sticking depends on whether the leather surface is flat or not. The most important thing is how much rubber there is, but too much rubber is not good.

Extended data:

The maintenance of table tennis bat can be simply summarized as three sentences: the bottom plate is moisture-proof, the rubber is anti-aging and the use is anti-falling.

The specific method is: after the racket is used, wipe the stains on the rubber surface with a special sponge, and stick a special ping-pong anti-sticking protective film after the water dries. The positive electrode glue should be collected after the leather surface is dried. When collecting rackets, put them in a ventilated and dry place, away from heat sources, and avoid exposure to sunlight. Do not pile up heavy objects on the rackets.

1, avoid heating. Sponges and rubber of table tennis bats are easy to age after being heated, and their viscosity and elasticity are reduced, commonly known as "death". The board is also easy to deform after being heated, which affects the accuracy of hitting the ball. At the same time, avoid contact between sponge and rubber sheet and gasoline. Rubber products will be deformed and deteriorated once they come into contact with gasoline, so special attention should be paid to it.

Because sponge is an expanding body, it should not be excessively pulled and stressed during use. When playing in a low temperature place, you should pay attention to proper heat preservation, because the bottom temperature will affect the elasticity of the sponge. People who use a single piece of rubber sheet and sponge sheet should use a fire-roasting electric perm head to iron the rubber sheet when replacing the rubber sheet, so that the glue between the rubber sheet and sponge can be fully dissolved and the sponge can be prevented from being damaged when replacing the rubber sheet. Glue can make the sponge foam and increase its elasticity, but when sticking to the bottom plate, use non-toxic special glue, which can protect both the sponge and the bottom plate.

2. Prevent friction, impact and extrusion caused by abnormal external forces. If you hit the ball correctly, the racket won't hit the table. When the racket is not in use, it is best to put it in a special racket case, and at the same time put a flat plate made of wood or plastic in the racket case to minimize the influence of external force on the racket.

3. Keep the racket surface clean. Once there is dirt on the rubber surface, the viscosity will be greatly reduced. At this point, you can gently wipe the glue racket with a clean cloth and water. The anti-adhesive racket should be wiped clean with a professional sponge every time after playing the ball. Care must be taken to avoid leaving scratches on the rubber surface. After the racket is used up, wipe the stains on the rubber surface with a special sponge, dry it and stick a special ping-pong anti-adhesive protective film.

The positive electrode glue should be collected after the leather surface is dried. When collecting rackets, put them in a ventilated and dry place, away from heat sources, and avoid exposure to sunlight. Do not pile up heavy objects on the rackets. In table tennis tools, there are many kinds of rubber covers, but they can be roughly divided into two categories, one is reverse stickers and the other is positive stickers. Reverse stickers include reverse glue and arc-proof glue, while front stickers include positive glue, raw glue and long glue.

Because of the different rubber content, the reverse rubber has large friction, strong surface adsorption and adhesion, and the contact point between rubber and ball is not easy to slide, which is beneficial to increase the rotation of ball. In order to give full play to this characteristic, the most important thing when using reverse glue is to keep the rubber clean. Don't rub the eraser with greasy hands. After playing the ball every time, you can rinse the rubber with clear water and paste a layer of plastic film. If there is dirt that is difficult to remove with clean water, it can also be cleaned with detergents such as soap and dried before use.

The front rubber is low in rubber content, high in tooth hardness, low in friction, small in area and easy to slide because the rubber is in contact with the ball. Based on this feature, special attention should be paid to keeping the rubber dry when using positive glue. If you play in a wet place, you can wipe the rubber with a desiccant to reduce the humidity on the rubber surface. Generally speaking, the bottom cover of rubber sheet is relatively thin. When sticking with a sponge, don't apply too much glue on the rubber at a time to prevent the rubber from being "rolled" and causing unnecessary losses.

References:

Baidu Encyclopedia: Table Tennis Bat-Maintenance