In fact, the hardness of the silicone tube is determined according to different types. For example, liquid silicone tube, can also be said to be liquid silicone tube, can do low hardness number of silicone tube, can reach between 0 degrees to 20 degrees; There are ordinary silicone tube, that is, solid silicone products process, at present, the whole silicone industry internal solid silicone products process can do the lowest softness is 30 degrees, the highest degree is 80 degrees, although higher degrees can be done, but the defect rate is too high, the product is brittle, is not good self-disassembly. So solid state technology is the most suitable for soft and hard degrees between 30 degrees and 80 degrees, can not do more soft products.
Shore hardness: refers to the reading of the value measured by Shore hardness tester, its unit is "degree", its description method is divided into A and D two kinds, respectively representing different hardness ranges, generally below 90 degrees with Shore A hardness tester test, and 90 degrees and above with Shore D hardness tester test and data.
When testing the hardness of the silicone tube, you can first use your hand to feel the soft and hard, if soft, use Shore A hardness tester to test; If hard, use Shore D hardness tester. In general, if the hardness of the silicone tube is less than 30 degrees, there will be bubbles, white spots and other phenomena in the production, so the exhaust stroke and the number of times must be controlled, exhaust frequency as little as possible, if the exhaust stroke can be shortened as far as possible, the addition of vulcanizing agent is appropriately reduced. Secondly, the mold temperature of the silicone tube can be properly increased, but the temperature should not be too high, otherwise there will be explosion phenomenon, if there are bad bubbles and white spots to prolong the curing time.
In short, the hardness of silicone tube produced by silicone tube manufacturers is generally 30-80A, 40A and 60A are the most common, and some specific hardness will be produced with special requirements.
