Since 1947, C.E. Conover & Co. has manufactured sealing systems for aircraft and spacecraft, growing from an aerospace supplier into a U.S.-based producer of engineered seals and molded and machined polymer parts. Its Bensalem operation is known for developing proprietary REVONOC materials and for supplying sealing components used in applications ranging from the Grumman lunar module to water treatment and pharmaceutical production. Conover is registered to AS9100D and ISO 9001:2015.
AS9100D
certification
ISO 9001:2015
certification
Stein Seal CompanySince 1955, Stein Seal Company has designed and manufactured custom seals and precision components for demanding aerospace, nuclear, marine and industrial equipment. The privately owned company has grown from five employees in rented space to more than 200 employees and over 100,000 square feet at its specialized manufacturing facility, with engineering, repair and dynamic testing capabilities under one roof. Its Pennsylvania operation holds ISO 9001:2015 and AS9100D certifications, along with NADCAP approvals and FAA and EASA repair-station certifications.336412KULPSVILLE, PA
Sur-SealFounded in Cincinnati in 1965 as a family-owned business, Sur-Seal manufactures engineered components that solve sealing, insulation, thermal-management and protection challenges. Its custom-converting work ranges from precision gaskets to molded and extruded parts, supported by engineering services and a manufacturing network that now spans the United States, Mexico and China. Sur-Seal’s history includes making gaskets for the Apollo missions, while its combined operations now encompass more than 400,000 square feet and over 500 employees.CINCINNATI, OH
Apple Rubber ProductsApple Rubber Products began in 1971 when its founder started the business from the back of a van, and it has remained rooted in Lancaster, New York. Today, the company designs and manufactures sealing components in-house for demanding medical, aerospace, and industrial applications, with more than five decades of experience behind its work. Its ISO 10,000 Class 7 clean room and AS9100 certification reflect its long-standing focus on highly controlled production.LANCASTER, NY
Seal DynamicsCelebrating its 50th anniversary in 2026, Seal Dynamics is a HEICO company founded in 1976 that grew from a specialized seal supplier into a global aerospace partner. Based in Hauppauge, New York, it is known for combining technical product knowledge with logistics support for commercial and military aviation customers, including round-the-clock assistance when aircraft are grounded. Its distribution quality system is certified to AS9120 standards.HAUPPAUGE, NY