Ozone aging, that is, ozone attacks carbon-carbon double bonds in elastomers and causes material damage, causing cracks on their surfaces. Rubber parts such as insulated cables, seals and tires will deteriorate with this.
Chloroprene rubber's resistance to atmospheric aging is second only to ethylene-propylene rubber and butyl rubber in general rubber, far superior to natural rubber. Neoprene is a sheathed wire and cable, and the actual use time can be up to 20-30 years It fully shows that neoprene has excellent weather resistance. In the broad sense of weather resistance, it should have ozone resistance, ultraviolet resistance, heat resistance, cold resistance, water erosion resistance, sand erosion and wind erosion. The most important ones are ozone and light. Function, according to the specific use environment can be divided into two main forms of photo-aging and ozone-based, and under normal circumstances, light and ozone occur simultaneously.
The concentration of oxygen on the earth's surface is not large, but it plays an important role in the open-air atmospheric aging process of vulcanizates. In some specific working environments, such as humid air under sunlight, electrolysis of a series of solutions, ammonia on water, decomposition of hydrogen peroxide, spark discharge effects, and exposure to static electricity, corona, ultraviolet rays, cathode rays, and other particles The effects of radiation and electric fields can cause a local increase in the ozone concentration in the atmosphere. In a high ozone environment, even if the rubber products are applied under static conditions, the aging tendency will increase significantly, which constitutes atmospheric aging mainly dominated by ozone aging. The most common examples of ozone atmospheric aging are wires and cables used outdoors. Under the action of current and corona, the surrounding air is prone to generate ozone, and the wires are in an atmosphere with a high ozone concentration. Therefore, it is required to use ozone with good ozone resistance. Material for the outer skin. If the product is subjected to ozone, it must be subjected to high-temperature environments, especially when it needs to withstand winding and elongation stress, which will obviously promote the aging process. At this time, the formula should be carefully designed to improve the protection against ozone.
The ozone aging standards related to wires and cables are very different from the general ozone aging standards. The ordinary rubber aging standards: low concentration, that is, 23-300PPHM. Such as ISO1431; wire and cable: high concentration, ie 300PPM=30000PPHM, such as IEC 60811-403. Therefore, in order to reach the high ozone concentration and maintain stability in the wire and cable standard, there are higher requirements for the ozone generator in the ozone test chamber.
LIB Ozone Test Chamber is applicable for rubber or elastomer's resistance to ozone degradation. The elastomer sample holder in chamber that exposes them to ozone at concentration and duration apecified by a testing specification or standard.
