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RS ISO 13357-2: 2025
Petroleum products — Determination of the filterability of lubricating oils — Part 2: Procedure for dry oils

Abstract

This document specifies a procedure for the evaluation of the filterability of dry lubricating oils. The
procedure only applies to mineral-based oils, since fluids manufactured from other materials (e.g. fireresistant
fluids) can be incompatible with the specified test membranes. This document is applicable to
oils of viscosity up to ISO viscosity grade (VG) 100, as defined in ISO 3448. These oils are widely used as
hydraulic fluids, and within the range described, the variation in filterability due to viscosity is included
within the precision range of this document. The procedure is not suitable for some hydraulic oils on which
specific properties are conferred by the use of insoluble or partially soluble additives, or by particularly
large molecular species. These additives include some viscosity index modifiers and some friction modifying
additives.
This document can also be applied to oils of ISO viscosity grades (VG) 150, 220 and 320, as defined in
ISO 3448, using the specified 3,0 ?m rated membranes. These oils are widely used as heavy-duty lubricants
in equipment such as paper making machines and rolling mills. Within the range described, the filterability
as defined is not dependent on the viscosity of the oil.

General Information

Code	Classification	Theme	Pages	Publisher	Availability
RS ISO 13357-2: 2025	ADOPTED ISO STANDARDS	Petroleum and related technologies	23	Forth Edition Jul 2026	Available