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5. Wood you believe it? – The ceramic material used in the spark plug insulator – the white body that wraps around the central terminal – is composed mostly of an aluminum oxide material designed to withstand the heat and pressure generated by the voltage that passes through the plug. That wasn’t always the case, however. Early spark plug designs used porcelain, mica (a silicate mineral), glass and even – we are not making this up – wood.
Hey Brian!Just so you know for the future I now have the 1/4-32 sidefire plugs in standard length, plus .125, plus .250, and plus .375 lengths. I am also working on a line of plugs in those lengths where the cap is smaller and will have a silicon molded boot available. Trying to boot a 1/4-32 is kind of tough. I'm hoping to fix that.