Silicone vs NBR, EPDM and FKM: a sourcing checklist
Silicone is a rubber family. Compare specific compounds against temperature, fluids, movement and contact requirements before choosing an elastomer for a custom part.
Define the service environment
List continuous and peak temperatures separately, exposure time, fluids and concentrations, pressure and cleaning agents. Material-family ranges are only screening information. The material supplier’s technical data sheet and compatibility evidence must match the actual compound and operating conditions.
Compare compounds and seal design together
VMQ silicone, NBR, EPDM and FKM have different strengths and limitations. Check compatibility for the named fluid rather than assuming “oil resistant” covers all oils or solvents. Movement, abrasion, tear risk and compression set also depend on the geometry and test conditions.
Food contact is a separate check
No rubber family or cure system establishes food-contact suitability by itself. Request formulation-specific documentation and applicable finished-article evidence. Compare tooling, processing, inspection and service life assumptions as part of total cost.
Before requesting a quote
Send the drawing revision, application, material preference, critical dimensions, annual quantity, delivery market and required evidence. Feasibility, testing, price and timing need written project review.
Buyer questions
Can a generic comparison table approve a substitute material?
No. Use it to shortlist candidates, then review the specific grade and validate the part in its assembly and operating environment.