BS ISO 11425:2018,Rubber hoses and hose assemblies for automobile power-steering systems — Specification.
BS ISO 11425:2018 specifies requirements for five types of hose and hose assembly used in automobile power-steering systems, the five types differing in their pressure ratings and volumetric expansion.
Normative references
The following documents are referred to in the text in such a way that some or all of their contentconstitutes requirements of this document.
ISO 1402, Rubber and plastics hoses and hose assemblies-Hydrostatic testing;
ISO 2719, Determination of flash point- Pensky-Martens closed cup method;
ISO 2909, Petroleum products- Calculation of viscosity index from kinematic viscosity;
Construction and materials
The hose shall consist of:
a) a rubber lining;
b) reinforcement;
c) a rubber cover or alternatively, for type 5 only, a textile cover.
The hose shall be uniform in quality and free from porosity, air holes and foreign inclusions.
Performance requirement
Impulse resistance
When subjected to a pulse test carried out in accordance with ISO 6803, using the following conditions,each of at least four test pieces shall withstand a minimum of 225 000 cycles with no more than ISO/TR 11340: 1994 class 3 leakage at fittings, and no rupture or ballooning of the hose.
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