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Methods

High pressure autoclave test

Do you want to estimate the service lifetime of your product? Will it last 20, 50 or more than 100 years?
The estimation of service lifetime via high pressure autoclaves can give you answers.
 

Advantages of the method

  • Accelerated thermo-oxidative ageing

  • Reduced test duration of weeks to months 

  • Saving of time and energy

  • Leaching of stabilisers by aqueous test liquid

  • Adaption of pH-value possible

This accelerated test method is particularly suitable for geosynthetics, geomembranes, nonwovens, woven fabrics, woven tapes, yarns as well as pipes and plastic components.

To check whether the material quality is suitable for the application and to avoid expensive repair and maintenance costs, it is advisable to estimate the service life. In the high-pressure autoclave test, samples are exposed to an aqueous medium at an elevated temperature and increased oxygen overpressure. After certain time intervals, samples are removed and subjected to index tests.

At the same time, the oxygen pressure and thus the oxygen consumption due to the oxidation of the sample is continuously recorded. This can give an indication of the start of the ageing process after the stabilizers have been used up. The greater availability of oxygen leads to accelerated thermo-oxidative ageing and to reasonable test times of weeks to months until the failure criterion is reached. Using 3D or Arrhenius evaluation of the failure times under different test conditions, a service life estimate is obtained under application conditions.

Anja Armani
Project Manager Construction Products
Würzburg
a.armani@skz.de
Robin Kroh
Project Manager | Construction Products
Würzburg
r.kroh@skz.de

Further details

Test conditions
  •  
  • Test temperature of 60 °C to 100 °C
  • Oxygen overpressure of 0.5 bar to 50 bar
  • pH 3 to pH 10
  •  
Standards
  • DIN EN ISO 13438 
    Geosynthetics - Screening test method for determining the resistance of geotextiles and geotextile-related products to oxidation
  • HR10.01
    Pipes made of polyethylene, PE 100-(RC)Ox with high thermo-oxidative resistance for applications for higher temperatures and long service lives – technical requirements and test 
  • ÖBV-Guideline – Waterproofing
Materials
  •  
  • Polyethylene (PE)
  • Polypropylene (PP)
  • Polyvinyl alcohol (PVA)
  • Ethylene propylene diene monomer (EPDM)
  • etc.
  •  
Index tests
  • Mechanical tests, e.g. tensile test
  • Oxidation-induction-time (OIT)
  • Oxidation-onset-temperature (OOT)
  • Infrared spectroscopy (IR)
  • Viscosity number (VZ)
  • Melt flow rate, melt volume rate (MFR, MVR)
  • etc.

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