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The NLGI consistency number (sometimes called “NLGI grade”) expresses a measure of the relative hardness of a grease used for lubrication, as specified by the standard classification of lubricating grease established by the National Lubricating Grease Institute (NLGI). Reproduced in standards ASTM D4950 (“standard classification and specification of automotive service greases”) and SAE J310 (“automotive lubricating greases”), NLGI's classification is widely used. The NLGI consistency number is also a component of the code specified in standard ISO 6743-9 “lubricants, industrial oils and related products (class L) — classification — part 9: family X (greases)”.

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  • Consistance d'une graisse lubrifiante (fr)
  • NLGI consistency number (en)
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  • The NLGI consistency number (sometimes called “NLGI grade”) expresses a measure of the relative hardness of a grease used for lubrication, as specified by the standard classification of lubricating grease established by the National Lubricating Grease Institute (NLGI). Reproduced in standards ASTM D4950 (“standard classification and specification of automotive service greases”) and SAE J310 (“automotive lubricating greases”), NLGI's classification is widely used. The NLGI consistency number is also a component of the code specified in standard ISO 6743-9 “lubricants, industrial oils and related products (class L) — classification — part 9: family X (greases)”. (en)
  • La consistance d'une graisse lubrifiante est la résistance de cette graisse à la déformation. Elle se mesure au moyen d'un pénétromètre et se caractérise par la pénétrabilité des graisses travaillées ou pas. Elle est classée selon une échelle mise au point par le NLGI (National Lubricating Grease Institute), échelle qui donne un indice de consistance NLGI. Elle est spécifiée par une norme établie par cet institut ainsi que par les normes ASTM D4950, SAE J310 et NF ISO 6743-9. (fr)
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  • La consistance d'une graisse lubrifiante est la résistance de cette graisse à la déformation. Elle se mesure au moyen d'un pénétromètre et se caractérise par la pénétrabilité des graisses travaillées ou pas. Elle est classée selon une échelle mise au point par le NLGI (National Lubricating Grease Institute), échelle qui donne un indice de consistance NLGI. Elle est spécifiée par une norme établie par cet institut ainsi que par les normes ASTM D4950, SAE J310 et NF ISO 6743-9. L'indice de consistance NLGI seule n'est pas suffisant pour préciser la graisse requise pour une application particulière. Cependant, il complète d'autres classifications (telles que ASTM D4950 et ISO 6743-9). En plus de la consistance, d'autres propriétés (stabilité structurales et mécaniques, viscosité apparente, résistance à l'oxydation, etc.) peuvent-être testés afin de déterminer la pertinence d'une graisse pour une application spécifique. (fr)
  • The NLGI consistency number (sometimes called “NLGI grade”) expresses a measure of the relative hardness of a grease used for lubrication, as specified by the standard classification of lubricating grease established by the National Lubricating Grease Institute (NLGI). Reproduced in standards ASTM D4950 (“standard classification and specification of automotive service greases”) and SAE J310 (“automotive lubricating greases”), NLGI's classification is widely used. The NLGI consistency number is also a component of the code specified in standard ISO 6743-9 “lubricants, industrial oils and related products (class L) — classification — part 9: family X (greases)”. The NLGI consistency number alone is not sufficient for specifying the grease required by a particular application. However, it complements other classifications (such as ASTM D4950 and ISO 6743-9). Besides consistency, other properties (such as structural and mechanical stability, apparent viscosity, resistance to oxidation, etc.) can be tested to determine the suitability of a grease to a specific application. (en)
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