Did you choose the right industrial sealing material?

2026-06-03

1、 Expanded polytetrafluoroethylene (ePTFE) sealing gasket
Expanded PTFE is a sealing material made by stretching and puffing PTFE resin, which has excellent creep resistance and chemical resistance. It can withstand almost all chemical media (except for molten alkali metals and elemental fluorine) and is a universal gasket in the chemical industry.
Applicable scenarios: Flange sealing in the chemical, pharmaceutical, and food industries, especially suitable for highly corrosive environments.
2、 Modified PTFE sealing gasket
Modified PTFE is filled with materials such as glass fiber, carbon fiber, graphite, etc., significantly improving the disadvantage of pure PTFE being prone to cold flow while retaining excellent corrosion resistance.
Applicable scenarios: Petrochemical pipelines, valve flanges, and working conditions with high temperature and pressure.
3、 Packing seal (packing seal)
Packing is a traditional dynamic sealing method that achieves sealing by filling the packing box with sealing material. Common materials include graphite packing, PTFE packing, aramid packing, etc.
Applicable scenarios: valve stem seals, pump shaft seals, agitator seals, and other situations that require dynamic sealing.
4、 O-ring (sealing strip)
O-shaped sealing strip is an elastic sealing material with a circular cross-section, usually made of rubber or PTFE material. Easy to install and reliable in sealing, it is an ideal choice for flange and groove sealing.
Applicable scenarios: flange sealing, groove sealing, container cover sealing.
5、 Rubber sealing plate
Rubber sealing plate is one of the most widely used sealing materials, with common materials including nitrile rubber (NBR), ethylene propylene diene monomer (EPDM), fluororubber (FKM), silicone rubber (VMQ), etc. Different rubber materials have significant differences in temperature and medium resistance, so special attention should be paid when selecting.
Applicable scenarios: water treatment, HVAC, general industrial pipeline flange sealing.
6、 Metal winding pad
Metal wrapped gaskets are made by alternately winding V-shaped or W-shaped metal strips and non-metallic filling strips, and are currently one of the most widely used flange gaskets. It has the characteristics of good resilience and high temperature and pressure resistance.
Applicable scenarios: Sealing of high-temperature and high-pressure pipelines and container flanges in the refining, chemical, and power industries.
7、 Non asbestos sealing material
Non asbestos gaskets replace traditional asbestos with aramid fiber, fiberglass, carbon fiber, etc., balancing sealing performance and human health and safety, and are the mainstream choice under the current environmental trend.
Applicable scenarios: General industrial flange sealing, especially suitable for occasions that require health and environmental protection.
Selection Tips
1. First, let's look at the medium: for strong corrosion, choose the PTFE series, while for general medium, choose rubber or asbestos free
2. Looking at temperature and pressure again: choose metal wrapped pads for high temperature and high pressure, and rubber pads for low temperature and low pressure
3. Dynamic or static: Choose gaskets for static sealing and packing for dynamic sealing
4. Environmental compliance: The use of asbestos containing products is prohibited, and asbestos free materials are preferred

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How to choose industrial seals? Many people overlook this point