Custom Rubber Molding Guide: Processes, Tolerances & Materials
Custom Rubber Molded Parts — Overview
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.
Molding Processes
- Compression molding: economical for larger parts and low-to-medium volumes; simplest tooling.
- Transfer molding: better for complex geometries and bonded inserts, with tighter tolerances than compression.
- Injection molding: highest volumes, tightest tolerances, and complex parts — higher tooling investment.
Dimensional tolerances follow the RMA classes — see our RMA tolerance chart to specify the right class (A1, A2, A3) for your part.
Parts We Mold
- O-rings, gaskets, and seals
- Bumpers, mounts, and vibration isolators
- Grommets, bushings, and bellows
- Diaphragms and custom-shaped components
- Rubber-to-metal and rubber-to-plastic bonded parts
Industries Served
- Automotive and transportation
- Aerospace and defense
- Industrial and fluid power
- Medical and pharmaceutical
- Oil & gas
Commonly Used Elastomer Compounds
Silicone
EPDM
Butyl
Nitrile*
FKM*
TPE
PTFE*
* 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
Request for Quote
Feel free to get in touch with us for all your rubber component-related needs & for discussions around how can we help you as your preferred rubber component manufacturer.