This part of JB/T 12651 specifies the terms and definitions, classification, technical requirements, testing methods, inspection rules, marking, packaging, transportation and storage of filter paper for internal combustion engine filters. This section applies to filter papers for internal combustion engine air filters, oil filters, and fuel filters (hereinafter referred to as air filter paper, oil filter paper, and fuel filter paper respectively, collectively referred to as filter paper; except for wrinkled filter paper, pure glass fiber filter paper, and pure non-woven fabrics) ), other filter paper can also be used as a reference.