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 11a extending from a to the closed end 18a. The barrier coating 25 extends over a substantial portion of the outer surface of the test tube except the open end 16a. The barrier coating 25 is composed of a first layer 26 made of a polymer material such as an acrylate material, a second layer 27 made of a mixture of a Group IVA metal oxide material and silicon oxide, and an organic overcoat layer such as PVDC. And a third layer 28. |