Leachables are substances which leach out of the plastic material during normal laboratory use!
Additives easing production process (plasticizers, biocides, slip agents) are known to disturb biological assays. Thus their use must be avoided. Additives needed for product characteristics (e.g. not becoming brittle) are decreased to a minimum. Which substances may leach out of the plastic and if these are critical for assays is described by following graphic.