National Scientific 8-425 Screw-Thread Vials National Scientific Vials Pack. 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 C4013-11 Vials Pack