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A spark plug is a device for delivering electric current from an ignition system to the combustion chamber of a spark-ignition engine to ignite the compressed fuel/air mixture by an electric spark, while containing combustion pressure within the engine. 
According to its application field, spark plug has 5 classifications: automotive spark plug, motorcycle spark plug, lawn& garden spark plug, marine spark plug and industrial spark plug. According to material of central electrode, it can be divided into seven types: nickel copper spark plug, yttrium spark plug, single platinum spark plug, single iridium spark plug, double platinum spark plug, iridium platinum spark plug, and double iridium (pin-pin) spark plug. 
Zhuzhou Torch spark plug Co., Ltd is the largest manufacturers of spark plug in China. It is chief member of Spark Plug association of National Automotive Standardization  Committee (NASC). It has participated in drafting national standard of spark plug. Torch owns rich OE experience in both domestic and abroad market.