<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8">
</head>
<body>
<div style="font-family: inherit; font-size: inherit; color: rgb(0, 0, 0); background-color: transparent;">
</div>
<div style="font-family: inherit; font-size: inherit; color: rgb(0, 0, 0); background-color: transparent;">
Hi Amir,</div>
<div style="font-family: inherit; font-size: inherit; color: rgb(0, 0, 0); background-color: transparent;">
We get ours from Dischem (2%, 4%, 16%, and 20%). They call it HSiQ.</div>
<div style="font-family: inherit; font-size: inherit; color: rgb(0, 0, 0); background-color: transparent;">
<br>
</div>
<div style="font-family: inherit; font-size: inherit; color: rgb(0, 0, 0); background-color: transparent;">
The contact is Andy Thompson, andy@dischem.com. They are in Pittsburgh and mix it on order, but the resin comes from Canada so there is sometimes a tariff fee. He’ll make small quantities so you don’t have to order a liter each time.</div>
<div style="font-family: inherit; font-size: inherit; color: rgb(0, 0, 0); background-color: transparent;">
<br>
</div>
<div style="font-family: inherit; font-size: inherit; color: rgb(0, 0, 0); background-color: transparent;">
Aimee</div>
<hr style="display:inline-block;width:98%" tabindex="-1">
<div id="divRplyFwdMsg" dir="ltr"><font face="Calibri, sans-serif" style="font-size:11pt" color="#000000"><b>From:</b> labnetwork <labnetwork-bounces@mtl.mit.edu> on behalf of Amir Safavi-Naeini <safavi@stanford.edu><br>
<b>Sent:</b> Tuesday, August 11, 2026 5:01 PM<br>
<b>To:</b> labnetwork@mtl.mit.edu <labnetwork@mtl.mit.edu><br>
<b>Cc:</b> Taewon Park <twpark@stanford.edu><br>
<b>Subject:</b> [labnetwork] Current source for HSQ (FOx-16 / XR-1541)?</font>
<div> </div>
</div>
<style>
<!--
#x_pfptBannerc5ph7zk
{display:block!important;
visibility:visible!important;
opacity:1!important;
background-color:#cfd3d7!important;
max-width:none!important;
max-height:none!important}
html:root, html:root > div
{display:block!important;
visibility:visible!important;
opacity:1!important}
-->
</style>
<div>
<div style="display:none!important; display:none; visibility:hidden; font-size:1px; color:#ffffff; line-height:1px; max-height:0px; opacity:0; overflow:hidden">
Hi everyone, We use HSQ as our high-resolution negative e-beam resist at Stanford, mostly for nanophotonic and quantum devices in lithium niobate and silicon. We've been trying to restock and have not been able to find a current source. </div>
<div style="display:none!important; display:none; visibility:hidden; font-size:1px; color:#ffffff; line-height:1px; max-height:0px; opacity:0; overflow:hidden">
</div>
<div dir="ltr">
<div>
<div dir="auto">Hi everyone,<br>
<br>
We use HSQ as our high-resolution negative e-beam resist at Stanford, mostly for nanophotonic and quantum devices in lithium niobate and silicon. We've been trying to restock and have not been able to find a current source.<br>
<br>
Two questions:<br>
<br>
1. Where are people buying HSQ these days? FOx-16, FOx-25, XR-1541, or any equivalent formulation. A vendor name and a contact would be enormously helpful. We only need a liter or two every year or two, so we are not a large-volume customer and that may be
part of the problem.<br>
<br>
2. If the supply situation is genuinely dead, what are people using instead for high-resolution negative-tone work, and what did you give up in switching?<br>
<br>
For what it's worth, we store ours in LN2, so shelf life isn't our limiting factor we believe... <br>
<br>
Happy to summarize replies back to the list if there's interest.<br>
<br>
Thanks,<br>
Amir<br>
</div>
</div>
<div><br>
</div>
<span class="x_gmail_signature_prefix">-- </span><br>
<div dir="ltr" class="x_gmail_signature" data-smartmail="gmail_signature">
<div dir="ltr">
<div>
<div dir="ltr">Amir H. Safavi-Naeini<br>
Associate Professor<br>
Department of Applied Physics<br>
Ginzton Laboratory, Stanford University<br>
<br>
mail address:<br>
</div>
<div dir="ltr">
<div dir="ltr">Edward L. Ginzton Laboratory</div>
<div dir="ltr">348 Via Pueblo Mall, Box 336</div>
<div dir="ltr">Stanford University</div>
<div dir="ltr">Stanford, CA 94305-4088</div>
<div><br>
</div>
</div>
<div dir="ltr">office phone: +1 650 498 7496 [Room 309, Spilker]<br>
mobile phone: +1 626 379 3702<br>
zoom: <a href="https://urldefense.com/v3/__https://stanford.zoom.us/j/4970959839__;!!KGKeukY!3-rGPu-irtPthXqithYAG3cfY_w_fYvxpzyUe7FkHGQbiKYnmEyvpPsu9-wCvHY9CAbJEgfTULe2joQIq7sxQA$" target="_blank">
https://stanford.zoom.us/j/4970959839</a>
<div><a href="https://urldefense.com/v3/__http://www.stanford.edu/*safavi/__;fg!!KGKeukY!3-rGPu-irtPthXqithYAG3cfY_w_fYvxpzyUe7FkHGQbiKYnmEyvpPsu9-wCvHY9CAbJEgfTULe2joToTYNPtQ$" target="_blank">http://www.stanford.edu/~safavi/</a><br>
-------------------------------------------------</div>
</div>
</div>
</div>
</div>
</div>
</div>
</body>
</html>