9mm chromatography vial septa with screw cap aijiren Technology-aijiren. 9mm screw caps, septa and sample vials are specially designed for use with rotating or robotic samplers. 2ml, 12X32mm sample vials are made of amber, Class 1, Class B, Class B, and B borosilicate glass, and are equipped for sample identification The available cap colors include yellow, red, green and blue.