The ISO6743-9 standard is the classification of the X family (greases), which is encompassed within the ISO 6743 standard (Lubricants, industrial oils and class L related products).
Classification in this standard is based on the conditions of use of the grease, and not on its formulation.
We refer to greases by the following codes:
ISO-L-X-Symbol1-Symbol2-Symbol3-Symbol4- NLGI Grade
where:
L: Lubricant, industrial oil or related product.
X: Grease