RUBBER SEALS AND UNION GASKETS

Rubber seals and union gaskets are vital mechanical components used across industrial and plumbing systems to prevent fluid or gas leakage between mating surfaces. Gaskets are designed for static applications like joining pipes or flanges, while seals accommodate rotating or sliding part

Common Types of Union Gaskets

• SMS Union Gaskets: Commonly manufactured from materials like silicone rubber, these are utilized in hygienic, sanitary, food processing, and beverage piping systems.
• DIN Union Gaskets: Designed for specific DIN 11851 fittings, these feature a conical shape ensuring alignment when mated with machinery and pumps.
• Hammer Union Seals: Heavy-duty, round rubber seals typically made of NBR, FKM (Viton), or silicone, used in high-pressure oil, gas, and hydraulic joint connections.

Key Materials and Their Applications

The durability and application of these seals depend heavily on the elastomeric material used:

• Nitrile Rubber (NBR / Buna-N): Provides excellent oil and chemical resistance, making it the standard choice for automotive, pneumatic, and hydraulic repairs.
• Silicone: Highly flexible and temperature-resistant, ideal for sanitary pipelines and food/beverage-grade applications.
• EPDM: Known for strong weathering and water resistance, often used in outdoor or high-temperature water/steam applications.
• Viton (FKM): Best for high-temperature and highly corrosive chemical environments