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Elastic rubber joints are suitable for different scenarios.
When selecting elastic rubber joint materials, it is necessary to comprehensively consider the use environment (temperature, medium, pressure), material properties (elasticity, corrosion resistance, aging resistance), cost-effectiveness and installation and maintenance requirements. The following is a specific selection guide:
1. Select according to the use environment
Temperature range
Low temperature environment: cold-resistant rubber (such as EPDM and VMQ) must be selected to avoid low-temperature embrittlement.
High temperature environment: fluororubber (FKM) and silicone rubber (VMQ) are preferred, which can withstand high temperatures of 200-300℃.
Normal temperature environment: natural rubber (NR) or nitrile rubber (NBR) can meet the needs.
Media type
Water, weak acid and alkali: natural rubber (NR) and chloroprene rubber (CR) are applicable.
Oil media: nitrile rubber (NBR) has excellent oil resistance.
Strong acid and alkali, organic solvents: fluororubber (FKM) and tetrafluoroethylene rubber (AFLAS) are preferred.
High temperature steam: EPDM and FKM have outstanding high temperature steam resistance.
Pressure level
Low pressure (≤0.6MPa): Natural rubber and nitrile rubber can meet the requirements.
Medium and high pressure (1.0-2.5MPa): Reinforced chloroprene rubber, hydrogenated nitrile rubber (HNBR) or fluororubber are required.
2. Choose according to performance requirements
Elasticity and shock absorption
Natural rubber (NR) has good elasticity and is suitable for general shock absorption needs.
Butyl rubber (IIR) has excellent air tightness and is suitable for occasions requiring low compression permanent deformation.
Aging resistance
Silicone rubber (VMQ) is resistant to ozone and UV rays and is suitable for long-term outdoor use.
Fluororubber (FKM) is resistant to thermal oxygen aging and is suitable for high temperature environments.
Abrasion resistance
Nitrile rubber (NBR) has good wear resistance and is suitable for pipes containing particulate media.
Chlorosulfonated polyethylene rubber (CSM) is wear-resistant and corrosion-resistant and is suitable for harsh working conditions.
3. Cost and cost-effectiveness considerations
Natural rubber (NR)
Low cost, suitable for general water and gas pipelines, but poor oil resistance and temperature resistance.
Application scenarios: building water supply and drainage, general ventilation ducts.
Synthetic rubber (NBR, EPDM)
Moderate cost, balanced performance, suitable for the mid-end market.
Application scenarios: industrial water treatment, air conditioning systems.
Special rubber (FKM, VMQ)
High cost, but excellent high temperature and corrosion resistance.
Application scenarios: chemical, petroleum, pharmaceutical and other high-end fields.
IV. Installation and maintenance factors
Installation space
When space is limited, small and light rubber joints are preferred.
For example, nitrile rubber joints are lighter than fluororubber joints.
Maintenance convenience
In occasions that require regular inspection, it is recommended to choose rubber materials with natural color and no oil treatment to facilitate observation of aging.
V. Practical application suggestions
Chemical industry
Recommended fluororubber (FKM) or tetrafluoroethylene rubber (AFLAS), which are resistant to strong acids and alkalis and high temperatures.
Building water supply and drainage
Natural rubber (NR) or chloroprene rubber (CR) can meet the needs at a low cost.
Oil and gas
Hydrogenated nitrile rubber (HNBR) or fluororubber (FKM), oil-resistant and high-temperature resistant.
Food and medicine
Silicone rubber (VMQ) or EPDM, non-toxic, odorless, and in line with hygiene standards.
VI. Precautions
Avoid mixing
Different rubber materials cannot be mixed, otherwise the performance of the joint may be reduced.
Regular inspection
Rubber joints need to be regularly checked for aging and cracks, and replaced in time.
Environmental adaptability
Outdoor environments need to consider UV resistance and ozone resistance, while indoor environments focus on temperature resistance and medium resistance.
2025-04-16 14:38:34