Freezer silicone sealing strip is a relatively large sealing product, including cutting, bonding, adhesive, secondary vulcanization and other multi-stage secondary processing. From the perspective of production, there are some difficulties, whether it is extrusion or bonding. The low-temperature resistance and sealing performance of the freezer to silica gel is particularly important. At present, the silicone seal strip of the conventional freezer can be realized by ordinary glue. In some special freezers, the silicone seal strip with high and low temperature resistance is required. Next, we will understand it separately. The performance of these two low temperature resistant sealing strips and how low temperature they can withstand.
1. Ordinary freezer silicone sealing strip : temperature resistance range (-40~200°). In this range, low temperature can work for a long time and maintain normal softness. It can touch the low temperature of -60° in an instant but cannot work for a long time, which will cause certain damage to the silica gel. damage. Ordinary low-temperature-resistant silicone sealing strips are what we see in our daily life, such as household refrigerators and household freezers, which do not require particularly high low-temperature resistance, and can meet the requirements within -40. In addition to low temperature resistance, another requirement of the product is sealing. The silicone seal strip of the freezer can isolate external bacteria from entering the refrigerator or freezer to avoid bacterial growth, and can also isolate the cold air generated inside the refrigerator and freezer from being exposed. Therefore, silica gel is needed at low temperature. The environment needs to maintain the sealing strip and soft performance of the product.
2. Special type freezer silicone sealing strip: the raw materials it uses are different from ordinary sealing strips . Its scientific name is stupid silicone rubber, which is more resistant to low temperature than conventional silicone rubber, because its physical properties are extremely lazy and can be used at high temperatures. It is used in a low-temperature environment of -120°, and can maintain sealing performance in the process of -40~110° for a long time, and can be exposed to the extreme low temperature of 120~150° instantly. This product is mostly used in the sealing of medical freezers, medical refrigerators, ammonia nitrogen equipment, aviation equipment and other products, because they all require long-term exposure to low temperatures, and require instantaneous low temperatures to -100° and other extreme low temperatures.