The present invention relates to the use of pelletized flame retardants and flame retardant compositions in the formation of flame retarded formulations, the resulting flame retarded formulations, and molded andor extruded articles made from such flame retarded formulations. The structure includes a socket that has a substantially columnar external shape, is provided in the ball joint member, and has a socket bolt groove throughout a circumference in an outer circumferential surface of the socket. Fixed along the top edge of the sides and facing outwards are pins supporting bearing wheels. 2 microns and laser wavelengths ranging from 1. The gas curtain substantially prevents reactive gas in the ambient environment from entering the microchamber when the stage assembly moves relative to the top member.