This standard specifies the terminology, technical requirements and acceptance rules for spark plug porcelain insulators. This standard applies to porcelain insulators for spark plugs used in electric spark ignition systems of internal combustion engines. This standard does not apply to porcelain insulators for spark plugs used in aviation and special engines.
JB/T 9587-1999 history
1999JB/T 9587-1999 Technical specifications for high alumina ceramic insulators of spark plug