Our polypropylene syringes are manufactured only from high purity, laboratory grade polypropylene and polyethylene resins, containing no rubber or styrene parts, or silicone oil lubricants. The polypropylene barrel and the polyethylene plunger - the two components of the syringe assembly - are made as unitary pieces from materials that are very inert and unreactive towards most laboratory solvents and chemicals, making these syringes very suitable for measuring, adding or transferring deuterated NMR solvents and sample solutions, chromatography solvents and fractions, aqueous analytical samples of all kinds and most other general laboratory uses.