RPI 5ml Micrewtube Screw Caps, Green, 200 Per Package

Tubes are manufactured or exceptionally high-quality, transparent polypropylene without the use of slip agents, plasticizers, mold release agents and biocide substances. Offer exceptional centrifugation stability up to 25,000 x g; autoclaving with cap off; (121°C, 20 minutes); withstand temperatures from +121°C to -196°C; and writing surface on flat cap and side wall for quick sample indentification.

Caps offer complete sealing for minimal evaporation rate during long-term storage.  Center of caps feature membrane for easy puncture and access with a syringe/needle.  Once punctured, the opening can be usefuL for venting internal pressure during heating.