A practical reference to the three rubber molding processes — compression, transfer and injection — with the tolerances, flash, draft and design-for-manufacture guidance each one demands. Engineers use it to match part geometry and volume to the right process, then ARC molds it to your exact spec under ISO 9001:2015 and IATF 16949:2016.
Request a Quote All Guides & Charts →This custom rubber molding guide compares the three production processes engineers weigh when sourcing a molded elastomer part: compression molding, transfer molding and injection molding. Use it to match your part's geometry, wall thickness, annual volume and tolerance requirements to the right process, then check the practical limits on dimensional tolerance, flash, draft angles and design-for-manufacture (DFM) before you release a drawing. It's built for engineers and procurement teams searching for custom rubber molding, injection vs. compression molding or rubber part tolerances who need to spec a part correctly the first time.
ARC molds each part to your exact print. We help you select the process and the elastomer — from EPDM, nitrile and silicone to FKM/Viton-class and specialty compounds — validate the design for manufacturability, and produce it under ISO 9001:2015 and IATF 16949:2016 quality systems. Send a drawing and target volume and our engineers return a fast, no-obligation quote with the recommended process and tolerances.
American Rubber Corp manufactures custom molded rubber parts to your drawings and specifications using compression, transfer, and injection molding. This guide covers the molding processes, dimensional tolerances, and materials so you can specify a part that is both manufacturable and cost-effective.
Dimensional tolerances follow the RMA classes — see our RMA tolerance chart to specify the right class (A1, A2, A3) for your part.
* Nitrile: Buna-N o NBR, FKM: Generic compound of Viton – a registered trademark of Chemours Company, PTFE: Generic compound of Teflon – a registered trademark of Chemours Company
Send your drawing, dimensions and volume — our engineers confirm the molding process, tolerances and tooling and map a path to production.
