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Minimizing Surface Finish Issues (ISO Scarring/Whitening) with Loctite 3843-Matte Black Resin

Loctite 3843 Matte Black resin contains a chemical component that may leach out during cleaning, often appearing as a white residue or surface haze on the printed part. This can negatively impact the part's surface finish and overall appearance.

Recommended Post-Processing Procedure

1.Use Clean IPA

  • Ensure that the Isopropyl Alcohol (IPA) used in the B9Clean unit is as clean and fresh as possible.
  • Contaminated or saturated IPA can increase chemical leeching from the part.
2. Minimize Clean Cycle Time
  • The longer a part sits in IPA, the more likely it is to experience surface leeching.
  • Recommended clean cycle: 10 minutes max. Depending on part size and complexity, less time may be more effective.
3. Immediate Compressed Air Drying
  • As soon as the part is removed from the clean unit, blow off residual IPA using clean compressed air.
  • This step is critical to stop ongoing chemical interaction with IPA on the surface.
4. Repeat Short Cleaning Cycles if Necessary
  • If resin remains on the part, repeat steps 2 and 3 using shorter cleaning cycles (1–2 minutes max).
  • Continue until all visible resin is removed.

 5. Remove Surface Whitening (if visible)

  • If white residue remains, place the part in a container of clean IPA and then into an ultrasonic cleaner.
  • Run for 30–60 seconds, then remove and dry with compressed air.
  • This helps dislodge any leached compound clinging to the surface.
6. Allow Drying Time Between Cycles
  • Wait 10–15 minutes between repeated cleaning cycles.
  • This allows the part to fully dry and any absorbed IPA to evaporate from within the material.

Important Notes

  • These steps do not guarantee a perfectly clean surface, but they will greatly reduce whitening and other finish-related imperfections.
  • Consistent cleaning practices and fresh IPA are key to maintaining optimal surface quality.

If you have any questions or need further support, please contact our technical team.

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