Prometheus21
Mechanical
- Apr 22, 2023
- 104
Hello everyone,
Our production is intended for oxygen service (industrial and medical), meaning everything has to be cleaned for oxygen service in accordance with strict standards. We have a range of inspection methods employed to qualify the cleanliness of the final product; including Direct Visual Inspection, UV, Wipe test, Water break test and Mirror test. We have also used infrared spectroscopy in the past when the customer demanded it as well. We are now looking at the possibility of switching out the wipe test and water break test with test inks (dyne pens), meaning we want to test the surface tension for any indication of contaminants.
Does anyone have experience using dyne pens to verify part cleanliness? How effective/accurate is/was it? What minimum value did you deem acceptable (in mN/m or similar)?
This method is slightly different as we are used to measure mg/m2 contaminants. Now what would a good Dyne level be if I wanted to verify that a metal surface was indeed clean enough, given the minimum level of cleanliness is 50 mg/m2? (Relevant contaminant in this case: Fluids/greases - hydrocarbon films)
Any input would be appreciated!
Our production is intended for oxygen service (industrial and medical), meaning everything has to be cleaned for oxygen service in accordance with strict standards. We have a range of inspection methods employed to qualify the cleanliness of the final product; including Direct Visual Inspection, UV, Wipe test, Water break test and Mirror test. We have also used infrared spectroscopy in the past when the customer demanded it as well. We are now looking at the possibility of switching out the wipe test and water break test with test inks (dyne pens), meaning we want to test the surface tension for any indication of contaminants.
Does anyone have experience using dyne pens to verify part cleanliness? How effective/accurate is/was it? What minimum value did you deem acceptable (in mN/m or similar)?
This method is slightly different as we are used to measure mg/m2 contaminants. Now what would a good Dyne level be if I wanted to verify that a metal surface was indeed clean enough, given the minimum level of cleanliness is 50 mg/m2? (Relevant contaminant in this case: Fluids/greases - hydrocarbon films)
Any input would be appreciated!
