PeneCert™ Test Services for Liquid Penetrant Testing

PeneCert testing services monitor the quality of in-use penetrant, emulsifiers and developers to ensure continued compliance to standards like ASTM E1417 and AMS 2644.

Peak penetrant inspection system performance is highly dependent on the integrity of the penetrant, emulsifier and developer products.

Although these products are carefully formulated to withstand the abuse and rigors of the NDT inspection process, any material is susceptible to contamination and degradation during use, and penetrants, emulsifiers and developers are no exception.

Magnaflux recommends regular laboratory system checks on in-use penetrant, emulsifier and developer to comply with industry standards, ensure the conformance of the PT testing products and maintain penetrant inspection system performance.

Regular testing also helps establish the point of performance loss and material failure.

 Causes of contamination and degradation

Some facilities apply penetrants on a one-off basis; others store penetrants in closed tanks or containers until used. However, most facilities use the immersion method, where excess penetrant is allowed to drain back after application to the part being tested. With the immersion method, tanks are often open to the environment, which increases the risk of contamination. Coupled with this contamination can be introduced from the part(s) under test.

 

Causes of contamination include:

  • Water
    Contamination from water is the most common form of contamination. The water can come from pre-washed parts that are not fully dried, careless rinsing or from leakage from pipes. Water contamination is not generally a risk until the point where the water tolerance of the penetrant is met.
  • Dirt and insoluble solids
    Dirt and insoluble solid contamination can result from poor cleaning or allowing contaminant materials to fall into the tank.
  • Organic material
    Oils, lubricants, paints, greases, organic solvents, cleaning solvents and degreasing fluid are all sources of organic material contamination. Whilst penetrants are able to absorb amounts of oils and solvents, their level of fluorescence will be decreased and the penetrant washability will also be affected.
  • Alkaline cleaners and acids
    Alkaline cleaners and acids represent the most serious type of contamination as they destroy fluorescence when they come into contact with a penetrant. In addition, some alkaline cleaners contain metasilicates, which can prevent penetrants from entering and therefore detecting a crack.

Causes of penetrant degradation include:

  • Heat
    In some cases heat can be used to speed up the action of a penetrant. However, prolonged exposure to temperatures over 60 °C can reduce the fluorescence of a penetrant. Temperatures in excess of 120 °C will destroy fluorescence completely.
  • Evaporation
    Penetrants stored in open tanks will undergo continuous evaporation, especially if the tanks are large and exposed to warmer temperatures. Evaporation may cause an increase in viscosity, which would subsequently increase the time taken to remove the penetrant.
  • Faulty equipment
    Un-calibrated or faulty equipment and accessories can compromise penetrant systems. For example, drying oven thermostats or controls that are set improperly set can lead to incorrect oven temperatures. Similarly water pressure gauges can malfunction or the UV output from black light bulbs can be reduced with aged bulbs.

The effects of contamination and degradation will depend on the type and amount present. Any change in colour or consistency should be addressed immediately to ensure consistent inspection results.

 Testing options and guidelines

Penetrant system testing can be performed in-house or using an external service. ASTM E1417 has established standards for performance checks for in-use materials.

In-Use Penetrant Test Requirements ASTM E1417
System Performance Daily
Penetrant Contamination Daily
Developer Contamination (Soluble and Suspendable) Daily
Developer Concentration (Soluble and Suspendable) Weekly
Developer Condition - Dry Powder Daily
Water Content (Water Washable only) Monthly
Emulsifier concentration (Hydrophilic Only) Weekly
Penetrant Sensitivity As required per 7.8.3
Fluorescent Brightness - Measured Brightness Quarterly
Emulsifier Water Content (Lipophilic only) Monthly
Penetrant Removability (Water Washable only) As required per 7.8.3
Emulsifier Removability (Lipophilic and Hydrophilic) As required per 7.8.3


Facilities that do not have the instrumentation or resources to carry out on-site testing can opt to use the Magnaflux PeneCert Service.

 How to use the PeneCert Service
  1. Get a quote: Contact us for a price quotation for your PeneCert service.
     
  2. Collect samples: For each in-use material to be tested, collect a sample - Magnaflux can supply bottles for this purpose on request. If the material is not manufactured by Magnaflux, please also include a sample of the unused material for use as a testing standard.
     
  3. Label bottle(s): Fill out a label and attach to the appropriate sample bottle(s). Please ensure that each bottle cap is tightened securely.
     
  4. Complete form: Fill out a PeneCert menu form, indicating the testing that you require. If you are sending more than one sample of penetrant, please complete one form per sample.
     
  5. Send samples: Send your samples to: Aerotech Laboratories Ltd, (Magnaflux PeneCert), Unit 20, Mercia Business Village, Westwood Business Park, Coventry, CV4 8HX, UK.
     
  6. Results: We will endeavour to despatch your results within 72 working hours of receiving your samples. If you prefer, we can fax or email your results - please indicate your preference on the PeneCert menu form and ensure that we have the appropriate contact details.
     
  7. Invoice Invoices will be issued from the Magnaflux office in Swindon, UK.
Please wait while we gather your results.

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