METHOD FOR COATING SPARK PLUG THREADS WITH A POLYTETRAFLUOROETHYLENE MIXTURE

摘要

The invention relates to a method for coating spark plug threads with a polytetrafluoroethylene mixture comprising the steps of (a) bringing the spark plug to room temperature (21 to 26° C (70 to 79°F); (b) mixing polytetrafluoroethylene mixture thoroughly and filtering the material through a 100-mesh stainless steel screen (0.146 mm openings); (c) applying a minimum dry film thickness of 20 to 30 microns (0.8 to 1.2 mil) to the spark plug thread; (d) baking the spark plug for 15 to minutes at a metal temperature of 232 to 260°C (450 to 500°F)