What is the hardness of silicone keys more appropriate

Although it is said that 30 ° and 70 ° silicone rubber can also be mixed with 55 ° silicone rubber, it is not recommended to use 30 ° and 70 ° silicone rubber for mixing, because these two kinds of rubber materials are not only extremely sticky when mixing rubber, but also very sticky when oil pressure molding, which will make it difficult to demould, especially the silicone keys with complex structure in silicone products

The hardness of the silicone key is determined by the raw material of the silicone. The common silicone hardness is 30, 50 and 70 degrees. The higher the hardness of the silicone key, the better its feel will be. However, if the hardness is too high, it will also affect the service life of the product. The lower the hardness, the softer the keypad corresponding to the silicone key will be, and the worse the feel will be. In addition, the friction between the key and the plastic hole will increase, which is easy to cause key sticking. Therefore, it is generally required that the hardness of silicone is 50 ° or 60 ° when making silicone keys.