| abstract |
(57) [Summary] (Modified) [PROBLEMS] To provide a plastic blood collection tube having a multilayer barrier effective for permeability to gas and water. A blood collection tube assembly includes an open end. It has a plastic test tube 10a with a side wall 11 reaching from the closed end 18 to. The barrier coating 25 has an open end 16 Spread over a substantial portion of the outer surface of the test tube except a. The barrier coating 25 includes a first layer 26 made of a polymer material such as acrylate, a second layer 27 having a multi-layer structure of an inorganic coating and an organic coating, and a third layer made of an organic overcoat layer such as PVDC. And layer 28. |