DIN EN 2379-2018 Aerospace series – Fluids for assessment of non-metallic materials.
This European Standard specifies preferred test fluids for evaluating the resistance of non-metallic andrelated materials to the action of fluids.
The aim of this document is to rationalise the choice of fluids used for qualification and batch testing ofmaterials.
In some cases, the test fluid and conditioning temperatures may closely simulate in-service conditions.However, no direct behaviour with service conditions shall be implied.
2 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. For dated references, only the edition cited applies. Forundated references, the latest edition of the referenced document (including any amendments) applies.
EN 2744, Aerospace series — Non-metallic materials — Preferred test temperature
ISO 1817, Rubber, vulcanized or thermoplastic — Determination of the effect of liquidsSTANAG 1135, Interchangeability of Fuels, Lubricants and Associated Products Used by the Armed Forcesof the North Atlantic Treaty Nations 1
3 Terms and definitions
No terms and definitions are listed in this document.
ISO and IEC maintain terminological databases for use in standardization at the following addresses:
• IEC Electropedia: available at http://www.electropedia.org/
• ISO Online browsing platform: available at http://www.iso.org/obp
4 Test fluids
The preferred test fluids are given in Table 1 and are grouped as follows:
Group 1 – Mineral and synthetic oils
Group 2 – Hydraulic fluids
Group 3 – De-icing fluids
Group 4 – Solvents
Group 5 – Simulated corrosion inducing fluids
Group 6 – Simulated fuels
Group 7 – Test fuels
4.2 As commercial fluids, and those specified by performance requirements may not have an entirely constant composition, exposure should, whenever possible, be in well defined chemical products used alone or in mixtures. When it is necessary to use proprietary fluids, it is recommended that a stock offluid is obtained, its composition fully detailed, and use restricted to environmental testing.
5 Test temperatures
5.1Test temperatures shall be selected from EN 2744.
5.2 When selecting the test temperature consideration shall be given to the flash point, maximum safe test temperature and toxicity of the test fluid in combination with the test specimen. It is necessary for all conditioning and testing to be performed in accordance with local and national requirements for health and safety at work and protection of the environment acts.
5.3 Elevated temperature exposure increases the rate of oxidation of some materials. This effect can be reduced by restricting the access of air to the testing equipment.
6 Exposure requirement
The requirements for the exposure of test specimens to a fluid contamination e.g. pre-conditioning, fluid,method of exposure, duration and temperature are given in the relevant technical specification or material standard.
7 Test report
The requirements for the contents of the test report are given in the product standard.DIN EN 2379 pdf download.