Hardness directly affects the hitting feel. Generally speaking, the softer the rubber sleeve, the easier it is to deform and rotate. But if the rubber is too soft, the feedback on the strength will be worse. In layman's terms, it is impossible to play hard.
At present, there are two standards for the hardness of table tennis rubber covers, Shore hardness and standard hardness. The main difference between the two is that the measurement standards are different, but they all represent the same attribute.
The hardness measurement method of rubber sleeve usually adopts the method of averaging after multi-point measurement. Because rubber sleeve is a chemical product, the foaming density of vulcanized sponge may be different, so the multi-point measurement method can avoid errors to the greatest extent and quantify the performance of the product. However, the difference of high-quality rubber products in multi-point measurement is also very small.
Shore hardness is measured by Shore hardness tester, which is divided into needle type and ball type. Standard hardness is another measurement method of hardness tester. Generally speaking, in the domestic rubber cover, the brand Double Happiness is a firm Shore standard user. For double happiness rubber, the forehand is slightly soft, and amateur friends generally choose products with Shore hardness of 39 -40 degrees. Specifically represents product madness? ? Rubber sleeve.
In my impression, Fan Ying, a former table tennis player, used this kind of hard rubber sleeve in the national team. She is a chopper, so she will choose a softer rubber sleeve to increase the fault tolerance in defense.
The standard hardness of rubber covers is common in imported rubber covers, and the hardness of imported rubber covers is generally concentrated in the standard hardness of 40 degrees to 50 degrees.
Imported rubber with 40 degrees or so is suitable for backhand use, and rubber with 45 degrees or above is suitable for forehand use. Because table tennis fans in China generally like to use sticky rubber forehand, they all like to use hard products as forehand rubber, which makes it easier to spin and improve the hitting quality. Therefore, many imported brands have also introduced products with a standard hardness of more than 50 degrees to cater to the usage habits of Chinese people.
Extended data:
Selection of sponge and rubber:
A, sponge:
In addition to the thickness and hardness, we should also observe whether the thickness is consistent, whether the foaming is uniform and whether the surface is flat. Put the sponge on a hard surface and press it with your fingers. A good sponge should feel soft and elastic when squeezed.
Put the sponge on your hand and feel its yield and activity, then knead it into a ball and suddenly let it go. Observe the expansion speed of sponge and the wrinkles on the surface of expanded cotton after expansion. Sponges with good elasticity have light specific gravity and rapid expansion, and almost no wrinkles can be seen on the surface.
Second, the rubber:
Usually, the domestic anti-adhesive surface is sticky, which is conducive to manufacturing rotation and suitable for pulling out the powerful rotating loop ball with time difference. However, the reverse glue made in Japan has rough surface and fast delivery speed, which is suitable for fast loop ball attack and pull. When choosing a release agent, you should see if it has been approved by ITTF. And observe the viscosity of the bonding surface and whether it contains impurities.