Introduction to the basic performance of O-rings (2)


Under the condition of 100% humidity, the silicone O-ri […]

Under the condition of 100% humidity, the silicone O-ring can absorb and condense water vapor equivalent to 40% of its own weight. As a desiccant, the average pore size of silica gel is 24 angstroms (length unit). The o-ring can absorb moisture even when the temperature is greater than 105 ° C, but when the temperature is greater than 38 ° C, its moisture absorption rate starts to decrease. The best hygroscopic state is between 21 ° C and 32 ° C. Even when the relative humidity is 60% -90% higher, the relative humidity in the container can be maintained at 40%. The silica gel desiccants are different varieties of moisture-permeable pouches. Silica gel, the main raw material Silica gel is a kind of water-containing silica with high microporous structure, non-toxic, odorless, odorless, chemically stable, and has strong hygroscopicity. Therefore, it is widely used to control the relative humidity of the environment in the storage and transportation of instruments, meters, equipment, leather, luggage, footwear, textiles, food, medicine, etc., to prevent items from moisture, mildew and rust. Silica gel desiccant is a kind of highly active adsorption material. It is usually made by reacting sodium silicate with sulfuric acid and undergoing a series of post-treatment processes such as aging and acid foaming. Silica gel is an amorphous substance, and its chemical molecular formula is mSiO2. nH2o. Insoluble in water and any solvents, non-toxic and odorless, chemically stable, and does not react with any substances except strong bases and hydrofluoric acid. The chemical composition and physical structure of silica gel determine that it has the characteristics of many other similar materials that are difficult to replace. Silica gel desiccant has high adsorption performance, good thermal stability, stable chemical properties, and high mechanical strength. The food-grade silicone tube refrigerant vapor is radiated to the outside world through a condenser to condense into a high-pressure liquid. This condensed liquid flows into the evaporator through the capillary throttling to reduce the pressure, and absorbs the heat of the cold bile. The above is a complete refrigeration process, but generally this process is continuously circulated to achieve the purpose of cooling. When the water temperature drops to the set temperature with time, the contact of the refrigeration thermostat is disconnected, the green indicator light for the refrigeration goes out, the compressor stops, and it enters the insulation mode. The car instrument is an important part of a car. Automobile meters include: oil pressure gauge, water temperature gauge, fuel gauge, water temperature gauge and fuel gauge, charging gauge. The importance of automobile instruments can be seen from these components, and the performance of the entire automobile components can be well displayed. The oil pressure gauge is an instrument unit that displays the oil pressure in kPa (kPa). The water temperature meter is a meter showing the temperature of the cooling water, and the unit is ° C (Celsius). The fuel gauge is a meter that displays the amount of fuel in the fuel tank. The unit is L (liter). The charging meter shows the state of charge and discharge between the generator and the battery. There are ammeters and voltmeters. Now more and more electronic products are applied to automobiles, and the penetration rate of various types of automotive electronic products in automobiles will continue to increase. The tightness, waterproofness, shock resistance, insulation, etc. of all kinds of instruments must be well done. The sealing, waterproof, shock-proof, and insulation properties of these components all require the use of silicone for automotive instruments. Using this silicone for potting or sealing can play the role of shockproof, waterproof and insulation of automobile parts.
Based on the policy of leading the industry, continuous improvement, and the pursuit of excellence, in the new year, Dongguan Yichi Rubber Products Co., Ltd. will further create outstanding product quality through outstanding management, and bring together outstanding talents to continue to create miracles in the industry. The silicone O-ring is out of the requirements of ecological environment protection. The old refrigerant R22 is gradually replaced by new refrigerant. In the past, neoprene or fluorine rubber was usually used for sealing, but in the new refrigerant, the materials used for O-rings are nitrile rubber, carboxylic acid nitrile, fluororubber, ethylene-propylene rubber, hydrogenated nitrile rubber, silicone rubber, and neoprene. Rubber, fluorosilicone rubber, polyurethane, chlorohydrin rubber, styrene-butadiene rubber, butyl rubber, natural rubber, ethylene / ethylene propionate rubber.