Defining Method A(W)
Method A(W) is a separate category for Method A penetrants and defined by AMS 2644 as a “Water Washable penetrant that contains 20% or more water by volume in its formula.” This category was added to the G revision of AMS 2644 and issued in April 2019. The current revision of AMS 2644 is H, which was issued in July 2020.
Differences between Method A & Method A(W)
For in use penetrant testing, Method A(W) has a different testing method and frequency for water content than Method A penetrant. The water content test is a quick weekly check for Method A(W) penetrants with the use of a refractometer.
If necessary, adjustments may be made by adding water or the Method A(W) penetrant to the tank.
Features of Water-based Penetrants
Reliably Speed Up Inspection and Wash Processes
Increase throughput and reduce costs by eliminating the developer step of inspection processes depending on procedures and requirements.
Rapid rinse and post inspection washing of parts thanks to excellent washability properties.
Reduce Waste-Water Pollutants and Environmental Footprint
Reduce water treatment costs and discharge waste process water directly into the sewage system (depending on local regulations) due to minimal water-based contaminants.
Meet or exceed local discharge regulations with low Biochemical Oxygen Demand (BOD) and Chemical Oxygen Demand (COD) levels.
Things to Know About Water-based Penetrants
More frequent testing
- Method A requires a monthly concentration test by sending it into a lab or PeneCert program, while Method AW requires a weekly concentration test with a refractometer.
- If listed on QPL it meets the specifications for AMS 2644 as a Level I or 2 penetrant, depending on the classification.
- ZL-425 and ZL-440 are approved and qualified to AMS 2644.
Lower Water Treatment Costs
- Disposal is a benefit for water-based or a deterrent for oil-based.
- Maintenance due to the concentration of the water-base.
- Wastewater treatments costs can be lowered.
- Water-based is not suited for spray application.
- Only referring to ZL-425 & ZL-440.
- Typically used in emersion tanks.
|Water-based, water washable level 1 fluorescent penetrant; contains no petroleum distillates allowing direct drain disposal.
|Water-based, water washable level 2 fluorescent penetrant; contains no petroleum distillates allowing direct drain disposal.