No, all of our CE capillaries are coated with polyimide. This polymer imparts structural rigidity to the capillary but has the disadvantage of being non-UV-transparent.
Without the coating, the capillary would be very brittle and will break easily. However, this does not present a problem in typical usage since you only need a small portion of the capillary to be UV-transparent for the detection window. This can be accomplished using our Window Maker™ product.