Abdos Ria Vials are polypropylene /polystyrene tubes generally used in Radioimmuno Assay–a scientific method used to test antigens (for sample, hormone levels in the blood) without the need to use a bioassay. Abdos Ria Vials PP can withstand 3000 RCF during centrifugation while the transparent polystyrene tubes can withstand 1400 RCF. The PP tubes can accept common acids, alkalies & solvents at room temperature while the PS tubes can accept mild bases, weak acids but not organic solvents. Abdos Ria Vials PP are autoclavable while PS tubes are non-autoclavable.