Medical grade material: made of medical grade polyester (PET, PETG). The two raw materials have their own advantages: PET is light and frost-resistant, with a temperature tolerance of-70 C-120 C; PETG has a durable wall thickness and strong impact resistance, with a temperature tolerance of-60 C-75 C..High transparency: the bottle has high transparency, accurate and clear scale, which is convenient for perspective observation.Stability of resistance: good stability against chemicals, suitable for sample collection and holding of highly clean reagents, granular reference materials and standard samples for various liquid particle size tests.Easy-to-hold design: The shape of the square reagent bottle is more ergonomic, easy to grasp and not easy to fall.