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PA
Born from a Penn State paw-print car magnet in 1991, family-owned SDS Design manufactures American-made auto magnets, decals, stickers and related graphics in Whitehall, Pennsylvania. The company remains known for creating collegiate die-cut car magnets, serving hundreds of licensed colleges while also producing custom work for resort brands and other clients. Design and production are handled in-house at its Lehigh Valley location.
Founded in 1965 as an early long-distance seller, Sea Isle Corporation distributes institutional textiles and hospitality linens to facilities across the United States and Canada. The company buys closeout merchandise directly from major domestic mills, specializes in imports, and can arrange made-to-specification items, while nationwide warehousing supports shipping stock orders in one to two days. Sea Isle serves customers with personalized attention through an automated ordering operation and also provides group-purchasing contracts.
Founded by Lehigh University professor and IEEE Fellow Yahong Rosa Zheng, Sea-Gal Technologies turns university research into fieldable underwater acoustic communication products. The Bethlehem startup develops high-data-rate MIMO modems, acoustic-system components and software, while helping integrate them with AUVs, robots and other underwater platforms. Its work recently received an Ocean Enterprise Accelerator Award for low-cost acoustic imaging focused on biofouling detection and NSF SBIR/STTR support for MIMO underwater communications.
Seakeeper Inc. makes marine motion-control equipment, including gyroscopic stabilizers for boats and the Seakeeper Ride vessel attitude control system. Formed in 2008, it launched its first gyroscopic stabilizer that year and now operates a manufacturing, engineering, and research and development facility in Leesport, Pennsylvania. Its products address boat stabilization both at rest and underway.
Seal Tite LLC manufactures prefabricated galvanized duct, pipe, and fittings for air distribution, continuing a trade name first used by the Peck-Williamson Heating Co. sheet metal shop in 1900. The company describes more than 125 years of Seal-Tite history and presents its products as designed for conditioned-air distribution, with production locations identified in Hillsboro, Ohio, and Lebanon, Pennsylvania.
Sealed Air Corporation makes packaging materials and equipment for protecting goods and packaging food, medical, and life-science products. Founded in 1960, it grew from the invention of BUBBLE WRAP® cushioning and now reports 105 manufacturing facilities and service in 119 countries and territories. Its portfolio includes CRYOVAC® food packaging and protective packaging products, alongside design and performance-testing services.
Sealing Devices grew from Terry Galanis Sr.’s $157 home-based venture in Alden, New York, into a third-generation family-owned company serving critical applications. Founded in 1963, the Lancaster-based manufacturer supports customers with custom sealing work and related engineering guidance, while maintaining a 225,000-plus-square-foot manufacturing footprint and serving all 50 states and more than 20 countries. Its quality systems have been certified to ISO 9001:2015 and AS9100D.
Founded in 1976 by Tony Urso, Pittsburgh-area Sealing Specialists and Service Company has grown from a distributorship into a 25-employee manufacturing, repair and distribution center for industrial seals. The Glenshaw company produces custom seals and gaskets, distributes sealing products across the United States and Canada, and repairs pumps and hydraulic cylinders in-house. Its ISO 9001:2015 certification and planned 22,000-square-foot expansion reflect a business entering its fifth decade with the same focus on making seal sourcing faster and more practical for customers.
Since 1985, Sealing Specialties Inc. has supplied high-performance sealing components and application-specific solutions for demanding industrial uses. The Souderton company pairs in-house and factory engineering with material-science expertise, reverse engineering, reliability studies, and on-site kitting to help customers solve difficult seal problems. Its stocked inventory and long-standing partnerships with manufacturers such as Parker, SKF, Gore, and John Crane support customers across a global reach.
SeaLion Energy is a Carnegie Mellon spinout developing longer-life batteries for robotics and advanced energy applications. Its patented technology applies ultra-thin nanocomposite coatings to battery electrodes to protect and regenerate critical battery materials. The company says it is incubated out of Carnegie Mellon University and funded by ARPA-E, the Scott Institute for Energy Innovation, and the U.S. Department of Energy.
SealMaster manufactures pavement sealer and sealcoat, and describes itself as one of the world’s largest producers in this field. Its network includes more than 150 U.S. manufacturing plants and distribution centers, with additional manufacturing in China and Mexico; the company says its products are distributed in more than 60 countries.
With roots in a 1959 packaging invention, Sealstrip Corporation designs and manufactures pressure-sensitive tapes and retrofit applicators that give flexible packages easy-open and resealable features. The Gilbertsville, Pennsylvania company has been developing these systems for more than 50 years, with products designed and made in the USA and distributed worldwide. Predominantly women-owned and managed, Sealstrip holds GFSI-recognized IFS PACsecure certification at the Higher Level and has developed recyclable mono-material options such as VerdeSeal.
Privately held and based in Germany, SEBERS Medical brings more than 15 years of experience in Transcranial Magnetic Stimulation to the development of non-invasive brain-stimulation technology. The company supports clinical providers and neuroscience researchers worldwide, with offices in Germany and the United States and a distribution network reaching more than 30 countries.
Secant Group develops and manufactures custom biomaterials and medical textile components for implantable devices, working from early design through full-scale production. Based in Pennsylvania, the company operates more than 150,000 square feet of facilities and combines decades of textile expertise with polymer platforms such as Hydralese and PGS for drug delivery and tissue-engineering applications. Its ISO 13485:2016-certified operations include ISO 14644 Class 7 and 8 cleanrooms, supporting medical device manufacturers from startups to global companies.
Founded in Lancaster in 1985, Sechan Electronics is a 100% employee-owned Department of Defense contractor that designs, tests, and manufactures high-reliability military electronics and electronic subsystems. Its Pennsylvania operations include a 115,000-square-foot main facility and a dedicated circuit-card center opened in 2021, supporting programs from circuit-card assemblies to integrated defense equipment. Sechan holds AS9100D and ISO 9001:2015 certification, with CMMI Level 3 design processes and ITAR registration dating to 1988.
SECO/WARWICK designs and builds industrial furnaces and metallurgical systems for heat treatment and vacuum metallurgy, with tailored equipment used across demanding manufacturing industries. The group combines Polish engineering roots in Świebodzin with an American furnace-making tradition in Meadville, where the SECO/WARWICK name has operated since 1984. Since its symbolic formation in 1991, it has delivered thousands of installations worldwide and supports equipment from other manufacturers through international service operations.
SECO/WARWICK designs and builds industrial furnaces and metallurgical systems for heat treatment and vacuum metallurgy, with solutions tailored to demanding manufacturing processes. The group grew from Polish engineering roots in Świebodzin and the American furnace tradition of Meadville, Pennsylvania, and has operated under the SECO/WARWICK brand since 1984. Its equipment and services now support customers in more than 70 countries, backed by research, automation and technical service capabilities.
With more than 40 years of combined experience, Second Street Speed is a Perkasie-based performance-engineering shop known for developing and testing engines for customers who need dependable power. Its complete research-and-development facility measures results rather than relying on claims, including computerized horsepower data and custom cylinder-head work.
As a women-owned small business, Secure Applications is known for helping companies guard unattended assets as they move through vulnerable parts of the supply chain. The company develops security solutions for specialized markets, including cold-chain transport and other shipments where visible evidence of tampering matters. It is certified to ISO 9001:2008 and serves customers across sectors such as aviation, healthcare, and logistics.
Founded in 2010 by owner George McDowell, Secure Cable Ties supplies cable ties and wire-management fasteners, growing from an initial 200 products to a stocked selection of more than 800 parts. The company stands out for its customer-service focus and for supporting custom product research, supplier sourcing, and batch testing alongside its catalog business. It works with major companies in high-tech sectors while continuing to offer affordable solutions for everyday cable organization.