Pdms Apk

[Dot Liljenquist]

Wehave had some trouble using the Form2 to print molds for PDMS casting as something in the plastic (using the Clear V2) prevents the PDMS from curing, but finally we have come to a solution. Most likely the problem lies with some of the photoinhibitors in the resin (see safety data sheet). Though as the material is proprietary this is difficult to be sure of.

@BlueCat I am strongly considering using BlueCast for modell that I will send to a casting house. They warned me about the issue of silicone curing inhibition. Is this an issue with the BlueCast ? I recieved a feature datasheet from Mr. Reale today and there is no mention of this. If it is an issue, what can be used to minimise the potential effect?

@DLab I regularly cast PDMS in clear resin molds. I use a mold release agent that I spray on them. Overnight at 60C I can take the PDMS part out and post-cure them roughly with a heat gun for 2min to fully cure the PDMS at hight temp.

Sylgard notes indicate that inhibitors include: Organotin and other organmetallic compounds, Silicone rubbers containing organotin catalyst. Sulfur, polysulfides, polysulfones and other sulfur containing materials. Also Amines, urethanes, amine containing material and other nitrogen-containing materials. And finally unsaturated hydrocarbon plasticisers.

@Telliria I am trying to make microfluidic device using mold made by clear resin on form 2. But roughness on mold still an issue for me which can hinder plasma bonding.

When I tried to print it as parallel as possible to the build plate, I am getting accurate dimensions but rough lines at an angle (same as FDM) on molding surface. but on the contrary, printing at 45 degrees giving good surface finish but inaccurate dimensions. Can you please share your protocol for printing a mold for microfluidic device with orientation and other settings so that we can get good dimensional accuracy as well as glossy finish ? Thanks in advance!

I agree to that. Grey resin comes with its own challenges. We tried to print parallel to the build plate, but the mold surface produces rough lines at an angle (Same as FDM) on molding surface which gets replicated on pdms surface which hinders its plasma bonding.

Thanks a lot for your response. Have you checked microscopically the casted pdms device? Were you able to do any plasma bonding with imprints of lines on pdms surface?

Actually I am doing cell culture in casted microfluidic device. I have tried standard clear and grey resin but microscopically the cell culture channel in replica molded pdms shows rough marks. It would be great if you can share images of your grey resin pro molds or casted PDMS, then I will be able to decide whether grey pro resin can satisfy my requirement or not? Also can you let me know with what orientation did you print the molds in printer?

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