ISO 6072:2011
Rubber — Compatibility between hydraulic fluids and standard elastomeric materials
ISO 6072:2011 specifies test methods for evaluating the effect of hydraulic fluids on standard elastomeric materials that have been manufactured in accordance with specified processes. It allows baseline comparisons of fluids with standard elastomers.
The standard provides formulations, mixing procedures and vulcanization procedures for five types of elastomeric composition: acrylonitrile-butadiene rubbers (NBR 1 and NBR 2), fluorocarbon rubber (FKM 2), ethylene propylene diene rubber (EPDM 1) and hydrogenated acrylonitrile-butadiene rubber (HNBR 1).
These procedures evaluate the effect of mineral-based, fire-resistant and biodegradable hydraulic fluids on such compositions by measurement, under controlled conditions, of physical properties of standard test pieces of the elastomer before and after immersion in the fluids.
The standard does not provide formulations of elastomeric materials for actual service, although service elastomers may be tested using these compatibility procedures if required.
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Scope_Exist
Foreword
Introduction
1 Scope
2 Normative references
3 Terms and definitions
4 Test elastomers
4.1 General
4.2 Standard acrylonitrile-butadiene rubber with 28 % acrylonitrile content (NBR 1)
4.3 Standard acrylonitrile-butadiene rubber with 34 % acrylonitrile content (NBR 2)
4.4 Standard fluorocarbon rubber (FKM 2)
4.5 Standard peroxide-vulcanized ethylene propylene diene rubber (EPDM 1)
4.6 Standard hydrogenated acrylonitrile-butadiene rubber with 35 % acrylonitrile content (HNBR 1)
5 Designation system for the elastomer compatibility index (ECI)
6 Determination of the ECI
6.1 Test conditions
6.2 Determination of change in volume, change in hardness and change in tensile strength and elongation at break
7 Test report
8 Identification statement (reference to this International Standard)
Annex A (informative) Further information on hydraulic fluids and the types of elastomer used with them
Annex B (informative) Example of test report — Fluid-elastomer compatibility index (ECI)
Annex C (informative) Rapid method for indicating, by measuring the volume change index (VCI), the change in volume of commercial rubbers when treated with mineral-based oils
Bibliography
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Scope_Exist
Foreword
Introduction
1 Scope
2 Normative references
3 Terms and definitions
4 Test elastomers
4.1 General
4.2 Standard acrylonitrile-butadiene rubber with 28 % acrylonitrile content (NBR 1)
4.3 Standard acrylonitrile-butadiene rubber with 34 % acrylonitrile content (NBR 2)
4.4 Standard fluorocarbon rubber (FKM 2)
4.5 Standard peroxide-vulcanized ethylene propylene diene rubber (EPDM 1)
4.6 Standard hydrogenated acrylonitrile-butadiene rubber with 35 % acrylonitrile content (HNBR 1)
5 Designation system for the elastomer compatibility index (ECI)
6 Determination of the ECI
6.1 Test conditions
6.2 Determination of change in volume, change in hardness and change in tensile strength and elongation at break
7 Test report
8 Identification statement (reference to this International Standard)
Annex A (informative) Further information on hydraulic fluids and the types of elastomer used with them
Annex B (informative) Example of test report — Fluid-elastomer compatibility index (ECI)
Annex C (informative) Rapid method for indicating, by measuring the volume change index (VCI), the change in volume of commercial rubbers when treated with mineral-based oils
Bibliography