Noticing this inefficiency in the previous insulators, Dr. Barlett used her previous knowledge in mineralogy and petrology, as well as the knowledge gained through experience working for AC Spark Plug (General Motors), to introduce a ceramic spark plug insulator made of material which would last longer as a result of its higher heat resistance and would require less maintenance overall. By encasing the spark plugs, she had made possible for them to become quite durable. Prior to the design changes, spark plugs would get covered in byproducts spewed by the engine and had to be manually cleaned every 70 to 150 kilometers for the vehicle to function effectively. Alumina insulator material allows plugs to handle high heat and voltage within the spark plug, enabling vehicles to operate in a more clean and, in turn, more efficient manner. Her essential work on spark plugs improved the overall capabilities of motor vehicles. In fact, Helen’s patented alumina spark plug insulators are so effective and efficient that they are still used in many present day automotive vehicles. In fact, Helen’s patented alumina spark plug insulators are so effective and efficient that they are still used in many present day automotive vehicles. She has been credited to have discovered that high alumina metals, containing approximately 0.35 percent lithium oxide precipitated zeta alumina, and over the course of her career, gained 7 patents in connection with her work (4 of which regarded the spark plug insulator).
