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Lube-Tips - About Penetrant and It's Dwell Time (Dye Penetrant Liquid)

18 May 2019
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Dwell Mode Method
The penetrant liquid can be applied in a number of different ways, including spraying, brushing, or immersing the parts in a penetrant bath. Basically there are two types of dwell mode method which is immersion-dwell and drain-dwell. Immersion-dwell is lettling the past immered in the penetrant liquid during the dwell time, drain-dwell is letting the test piece to sit for a sufficient period of time for the penetrant to fill into any flaws and crack. The drain-dwell mode has been shown to produce the most sensitive results. However, there is no harm in allowing a penetrant to dwell longer than the minimum time as long as the penetrant is not allowed to dry on the part.
 

Two Basic Penetrant Materials
Type 1 - Fluorescent Penetrants: they contain a dye or several dyes that fluoresce when exposed to ultraviolet radiation. 
Type 2 - Visible Penetrants: they contain a red dye that provides high contrast against the white develper background. 
 

Dwell Time
Penetrant dwell time is the total time that the penetrant is in contact with the part surface. The dwell time is important because it provides the sufficient time to allow the penetrant to penetrate into the flaws and cracks area. Dwell times are usually recommended by the manafacurer and each formulation are not design to perform the same. It is depends on the size of defects and material. 
 
Penetrant dwell time is the total time that the penetrant is in contact with the part surface. The dwell time is important because it allows the penetrant the time necessary to seep or be drawn into a defect. Dwell times are usually recommended by the penetrant producers or required by the specification being followed. The penetrant must possed a number of important characteristics:-
 
- spread easily onver th eseufrca of the material
- be drawn into surface breaking defects iby capilary action. 
- be highly visible or fluoresce brightly to produce easy to see indications. 
- not be harmful to the matrial being tested or the inspector. 


Product Link:-
https://www.davor.com.my/index.php?ws=showproducts&products_id=2488101&cat=Dye-Penetrant-Liquid-dye-pent&subcat=Spanjaard#openproducts


Contact Us:-
DAVOR LUBRICANTS CONSULTANT
Email: sales@davor.com.my
Whatsapp: +6012 - 291 9166
 

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