<div dir="ltr">Dear Long,<div><br>It does not last forever, though it DOES last after the expiration date on the label. I've heard of people decanting it on arrival and into smaller portions and freezing those, but I've never done that myself.</div><div><br></div><div>I think the main benefit to ZEP when compared to PMMA is its etch resistance to certain gases. The dose is sufficiently lower that if you need to write large areas it could be worth it.</div><div><br></div><div>You can also certainly obtain smoother features than with PMMA too, but for nearly all applications I'm not sure it's worth the price tag just for that. </div><div><br clear="all"><div><div dir="ltr" class="gmail_signature" data-smartmail="gmail_signature"><div dir="ltr"><div dir="ltr"><div dir="ltr">Orad Reshef, PhD</div><div dir="ltr"><br>Département de physique | Department of Physics<br>Université d’Ottawa | University of Ottawa<br><a href="http://boydnlo.ca" target="_blank">boydnlo.ca</a> | <a href="http://reshef.ca" target="_blank">reshef.ca</a><br></div></div></div></div></div><br></div></div><br><div class="gmail_quote"><div dir="ltr" class="gmail_attr">On Thu, Apr 29, 2021 at 11:48 AM Chang, Long <<a href="mailto:lvchang@central.uh.edu">lvchang@central.uh.edu</a>> wrote:<br></div><blockquote class="gmail_quote" style="margin:0px 0px 0px 0.8ex;border-left:1px solid rgb(204,204,204);padding-left:1ex">
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Hi Guys,
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<div>I have no experience with ZEP, but the data sheet suggest a critical dose of ~35 uC/cm2, approximately 1/10 of PMMA. What are the problems with ZEP and under what conditions is it worth the cost? Does it last forever in storage like PMMA?</div>
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<div>Thanks,<br>
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Long</div>
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