Description General description Oxygen-18O2 is a naturally occurring stable isotope of oxygen. Natural abundance of 18O2 containing at least 99 atom % O-18. Application 18O2 isotopic labelling was employed, in conjunction with time-of-flight secondary ion mass spectrometry, to characterize and elucidate the parts of the degradation mechanisms induced by molecular oxygen. Using 18O2 as a label, it is possible to study collagen degradation with this non-reutilized label and so avoid the large errors that are introduced by the recycling of other labels. Packaging 500 mL in Sure-Pac™ Recommended products Brass hose adapter Z146811 or brass body mini gas regulator Z513539 is recommended for 500 mL Sure/Pac cylinder (U.S only). For 1 L cylinder, either stainless steel control valve Z146951 or Z187224 is recommended. PTFE sealing washers GCA inlet size 180 Z146994 PTFE sealing washers CGA inlet size 110 Z146986