Bio-Simplex® Erlenmeyer Flask Systems. Each closed-system design includes a polycarbonate (PC) Erlenmeyer Flask, polypropylene (PP) cap and EZ Top® closure assembly to deliver a closed system suitable for bioprocessing. Closure assemblies are made from C-Flex® pharmaceutical-grade thermoplastic elastomer (TPE) resin and consist of tubing with choice of either Luer connections or CPC® quick disconnect end fittings, a Bio-Simplex FlexJoint™, a 0.2 μM vent filter (for sterile gas exchange) and a polypropylene cap. They are engineered to ensure an unobstructed fluid path and a secure elastomeric seal against plastic and glass and metal surfaces. Customer-generated designs, sizes, packaging and other options – such as connectors, heat-sealed ends or alternate gamma irradiated flask materials – are available on request.