SJK Seal is an industry-leading rubber molding manufacturer of custom rubber seals. We design, develop and produce a wide range of custom molded rubber products, including gaskets, diaphragms and seals. Our high-performance products provide reliable and cost-effective professional solutions for customers around the world.

With over 25 years of successful component design and development, our custom rubber moldings have been used in countless applications for professional and harsh environments. For fail-safe custom molded rubber products, SJK Seal is your preferred custom rubber molding supplier.

Our rubber manufacturing facilities are capable of handling a wide range of custom rubber moldings, from one-off prototypes to high-volume production. Depending on geometry and material requirements, we can quickly deliver new tools and first samples within 7 days.

• Soft-seal PTFE rubber bonded butterfly valve seals.
• Downhole packers and pipe-in-pipe waterstop seals.

• Formula 1 powertrain and KERS seals.

• High-performance PTFE rubber bonded diaphragms.
• Specialty valve diaphragms for self-contained breathing apparatus.

• Thin-walled diaphragms with precise flex characteristics.

• Rubber-to-metal bonded products.

• Precision rubber-to-metal bonded valve components.