Medical-grade O-rings for oxygen service require special cleaning and packaging to eliminate hydrocarbon residues. FDA seals intended for ventilators undergo triple solvent rinse and 48-hour vacuum baking at 100°C, achieving particulate counts below ISO 14644 Class 5. Individually double-bagged in nitrogen-purged environments, they prevent combustion risk in 100% oxygen. https://globalsealstech.com/medical/