AS568 and metric. Every compound family. Application engineering included.
PRP supplies O-rings across the full AS568 and metric size range in NBR, FKM, EPDM, VMQ, and FFKM — stocked and available on short lead times. Many Parker EMG compounds and sizes are stocked as standard. Non-standard sizing and custom compound configurations are available on application. If your fluid path demands more than a catalog lookup, that’s where PRP’s application engineering support begins.
Compound Families
The right elastomer for your application — not just the available one.
O-ring compound selection is a materials engineering decision. The wrong compound in an aggressive media environment, a high-cycle fluid path, or a cleanroom-processed assembly creates failure modes that catalog compliance won’t catch. PRP provides compound selection guidance across every major elastomer family.
NBR – Nitrile
General-purpose workhorse for petroleum-based fluids, hydraulic systems, and moderate-temperature applications. Good abrasion resistance. Not suited for polar solvents, ozone, or high-temperature oxidizing environments.
FKM – Fluoroelastomer
High chemical resistance for aggressive media, elevated temperatures, and fuel system applications. Parker EMG FKM compounds include: V0747-75 (black, general-purpose) and V0884-75 (brown, high-fluorine for demanding chemical environments). Parker O-ring alternative supply available across the FKM range.
EPDM – Ethylene Propylene
Preferred for water systems, steam, and polar solvent environments where nitrile or FKM is incompatible. Example: Parker EMG E3609-70 — NSF 51/61, WRAS, KTW, FDA, and USP Class VI compliant. Strong choice for pharmaceutical water systems and food-contact fluid paths.
VMQ – Silicone
Wide service temperature range. Biocompatible elastomer O-rings for pharmaceutical, medical device, and food-contact fluid paths. Example: Parker EMG S0604-70 and S0317-60 — both USP Class VI, FDA, and USDA compliant. First choice for cleanroom and high-purity process applications where biocompatibility documentation is required.
FFKM – Perfluoroeslastomer (Kalrez®)
Maximum chemical resistance and thermal performance for semiconductor etch, aggressive CPI, pharmaceutical, and high-purity process environments. Full Kalrez® compound range distributed by PRP — Kalrez 9100 stocked, balance of range order-on-demand. Application-specific FFKM O-ring compound selection support available.
Kalrez® is a registered trademark of Qnity Electronics, Inc.
VeriClean SealsTM
For fluid-path applications verified surface cleanlinesss is critical — liquid-cooled data center infrastructure, medical devices, pharmaceutical manufacturing, precision instruments — VeriClean Seals™ adds ISO Class 7 cleanroom processing and documented surface cleanliness to your existing O-ring specification. No compound change. No requalification. The same seal, measured and documented.
