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Industrial molded rubber Grommet Description
Industrial molded rubber Grommet is a common industrial sealing element, and the following is a detailed introduction to it:
Production process
Mixing: The rubber raw rubber is fully mixed with various compounding agents (such as vulcanizing agents, accelerators, fillers, antioxidants, etc.) in the rubber mixer to make a rubber compound with certain plasticity and processing performance.
Molding: Cut the rubber compound into a suitable size and shape and put it into a pre-designed mold. Then high temperature and high pressure are applied by hydraulic press and other equipment to make the rubber vulcanize in the mold, cross-link, and solidify into the desired rubber grommet shape.
Post-processing: Rubber grommets after compression molding may need some post-processing processes, such as deburring, cleaning, inspection, etc. Removing burrs can make the surface of the rubber grommet smooth and dimensionally accurate; Cleaning can remove dirt and impurities from the surface; The inspection is to ensure that the quality of the rubber grommet meets the requirements, including the inspection of dimensional accuracy, appearance defects, physical properties, etc.
| Material | NBR | FKM | VMQ | EPDM |
| Hardness (Shore A) | 40-95 | 50-90 | 30-80 | 40-90 |
| Tensile strength (MPa) | ≥7 | ≥10 | ≥5 | ≥7 |
| Tearing elongation (%) | ≥250 | ≥150 | ≥200 | ≥250 |
| Operating temperature (℃) | -20-110 | -40-200 | -70-260 | -57-176 |
Materials and characteristics
Nitrile rubber (NBR): It has excellent oil resistance and wear resistance, good resistance to lubricating oil, diesel, and other oil media, and also has good air tightness and aging resistance, and is suitable for various industrial occasions that require oil-resistant sealing, such as automobile engines, hydraulic systems, fuel systems, etc.
Fluoroelastomer (FKM): It can maintain stable performance in high-temperature environments, can be used in the temperature range of -20 °C-+200 °C or even higher, has excellent high-temperature resistance, chemical resistance, and oil resistance, and has strong resistance to strong acids, strong alkalis, organic solvents, etc., and is often used in sealing parts in high temperature and strong corrosion environments such as aerospace, chemical industry, and petroleum.
Silicone rubber (VMQ): The outstanding feature is that it has excellent high and low-temperature resistance, and can still maintain good elasticity and sealing performance in the temperature range of -70 °C - +260 °C, and also has the characteristics of ozone resistance, weather aging resistance, non-toxicity, etc., and is suitable for some occasions with a large range of temperature changes and high requirements for hygiene, such as sealing rubber grommet in the fields of medical equipment, food processing equipment, electronic appliances and other fields.
EPDM: It has high elasticity and chemical stability, good weather resistance, ozone resistance, heat resistance, can maintain stable performance in a wide range of temperatures, and has a certain resistance to water, alcohol, acid, alkali, etc., and is often used in automotive door and window sealing, building waterproof sealing, wire and cable insulation protection and sealing rubber grommet of some industrial equipment, especially in outdoor environments or occasions with high weather resistance requirements.
Fields of application
Automobile industry: used for the sealing of engines, transmissions, braking systems, air conditioning systems, and other parts to prevent oil and gas leakage and ensure the normal operation of various systems of automobiles. For example, a rubber grommet is used to achieve reliable sealing in engine cylinder gaskets, oil seals, fuel line joints, etc.
Machinery manufacturing: Rubber grommet is needed in the connection parts and seals of various mechanical equipment such as machine tools, compressors, pumps, reducers, etc., to prevent the leakage of lubricating oil, coolant, and other media, and at the same time, it can also play a role in buffering and damping, reducing wear, and improving the stability and service life of the equipment.
Chemical industry: In chemical production equipment, a rubber grommet is used for the sealing of pipelines, valves, reactors, etc., which can withstand the corrosion of various chemical media and high temperature and high-pressure environments, and ensure the safety and stability of the chemical production process. For example, in pipelines and storage equipment for highly corrosive media such as sulfuric acid, hydrochloric acid, sodium hydroxide, etc., corrosion-resistant fluoroelastomers or EPDM rubber grommets are required.
Electronic appliances: In electronic products, rubber grommets can be used to seal the shell, prevent dust and moisture from entering, and at the same time play the role of insulation and shock absorption. For example, a silicon rubber grommet is often used in the shell sealing of computer cases, mobile phones, tablets, and other equipment, which not only ensures the sealing of the equipment but also provides good insulation performance.
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