National Scientific 8-425 Screw-Thread Vials National Scientific Caps. Combining top-notch and uncompromising quality with an affordable price the Thermo Scientific 8-425 Screw-Thread Vials Thermo Scientific Caps C4013-3A/ 66030-416 can fulfill your laboratory needs while still offering a great value for the money. Preferred for use with many carousel tray autosamplers. Vials 66065-262 are manufactured from clear 33 expansion borosilicate glass. Tapered polypropylene MicroVial limited volume vials (66030-982 and 66065-148) are designed for limited volume applications. Conical-style Polyspring inserts are available in borosilicate glass or polypropylene. National Scientific 8-425 Screw-Thread Vials National Scientific C4013-3A Caps