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RUBBER Before Christopher Columbus visited the New World, Haitians were fire curing latex into spheres. Columbus took the proverbial rubber ball back to Europe in 1496, but it would it be nearly 350 years before Charles Goodyear discovered that the rubber could be vulcanized using sulfur and heat. If Goodyear put the bounce in rubber it was Roy Dunlop, in 1888, who put air in it to make pneumatic bicycle tires and it was not long before the elastomeric polymer was seen for its engineering design opportunities. Today, we at Stern Industries continue in the Goodyear and Dunlop traditions of engineering innovation, helping you find solutions to your rubber design and manufacturing needs. Whether you, like Columbus, are just discovering rubber as an option in your application or have been designing rubber components for years, we can help. We understand the properties of the various compounds and processes to make quality parts at competitive prices. We are ready to assist you in your design decisions and to source rubber components that will to contribute to your success in a competitive business environment. Click for an extensive discussion of rubber processes. See ASTM D2000 Rubber specs for more information. Please click on the Rubber processes at the left to find out more about which rubber process may best suit your needs!
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PLASTICS
Helping solve your dilemma is our core competency. The marriage of your part requirements to the right process is critical. Utilizing our access to a vast array of plastics choices will help your company succeed. Click for an extensive discussion of plastics processes.
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COMPRESSION MOLDING | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| © 2005-2008 Stern Industries, Inc. • 7756 College Road, Baxter, MN 56425 • 1.218.828.5076 • 1.888.828.1020 | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
Like injection and transfer, compression molded rubber parts and components are used in a variety of markets and applications. Some of these parts have a metallic insert that have the rubber bonded to a metallic insert that adds dimensional stability to the friction, sealing, or flexibility of the rubber surface. Compression lends itself well to small production runs and prototyping.
Compression molds and equipment are generally simpler in design and less expensive that those for either injection or transfer and have correspondingly lower overheads. Because the rubber preform is at ambient temperature when placed in the mold and sees less work on and flow of the material and than injection and transfer molding, the compression process generally requires longer time in the heated mold for complete crosslinking to occur. It is therefore slower and best suitable for smaller parts, lower volume production quantities and prototyping.
Most rubber compounds can be compression molded without process difficulty or special consideration. The end usage determines the design requirements and when an existing formula is not available that meets the design criteria, the chemist develops a compound to do so.