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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

Anja Armani
Geosynthetics | Sheets | Sport products
Würzburg
a.armani@skz.de
Robin Kroh
Geosynthetics | Sheets | Sport products
Würzburg
r.kroh@skz.de

Further details

Test conditions
  •  
  • Test temperature of 60 °C to 90 °C
  • Oxygen overpressure of 0.5 bar to 50 bar
  • pH 3 to pH 10
  •  
Products
  • Geosynthetics
  • Geosynthetic barriers
  • Nonwoven textiles
  • Woven textiles
  • Yarn
  • Pipes 
  • Components 
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.
Description of the method

The intended service life of plastic products is no longer 10 years, but often 30, 50 or even 100 years. A service life estimation is advisable to check whether the material quality is suitable for the application and to avoid expensive repair and maintenance costs. In the high-pressure autoclave test, samples in an aqueous medium are exposed to an increased temperature and an increased oxygen overpressure. After certain time intervals, samples are taken 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 indications of the beginning of the aging process after the stabilizers have been used up. The greater availability of oxygen leads to accelerated thermo-oxidative ageing and acceptable test times of weeks to months before the failure criterion is reached. By means of 3D or Arrhenius evaluation of the failure times under different test conditions, an estimation of the service life under application conditions is obtained.
 

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