New Chemical Request: V-40000 (Silicone and xylene mixture)

Neville Mehenti nmehenti at
Tue Aug 30 11:32:43 PDT 2005

I would like to make a request to bring a new chemical into the cleanroom 
for use in a process.
Below this email is the requested information for this new chemical 
request, as outlined on the SNF website.
Please let me know if there is a problem or if you would like any more 
Thanks very much and hope to hear from you soon.

1.  Name: Neville Mehenti; Coral: mehenti; Tel: (650)723-1669; Email: 
nmehenti at, PI: Prof. Stacey F. Bent

2.  Trade name: V-40000; Common name: Silicone and xylene mixture
Composition: Xylene (52-65%, CAS 1330-20-7), Ethylbenzene (<13%, CAS 
100-41-4), Silicone Elastomer (35%)
The MSDS is attached with this email as a pdf file.

3.  Manufacturer:  Rhodia Silicones
320 West Stanley Avenue, Ventura, CA 93001; Tel: (805)653-5638; url:
Vendor: Factor II, Inc.
P.O. Box 1339, Lakeside, AZ 85929; Tel: (928)537-8387; url:

4.  The reason I am requesting to bring this material into the lab is 
because I am looking to spin thin (10-20 microns) silicone membranes on a 
silicon-photoresist mold, and then peel them off to serve as components for 
microfluidic devices.  I have been using standard polydimethylsiloxane 
(PDMS), but the membranes are not strong enough to resist tearing during 
later processing steps.  I tried curing a more rigid PDMS by increasing the 
crosslinker/polymer ratio, but I will be later culturing neurons on the 
membrane, and this non-stoichiometric ratio results in cell death through 
the exposed dangling bonds.  This new material (V-40000) has superior 
physical properties (tensile strenght, tear strength, etc.) when compared 
to the PDMS, and is also supplied as a medical-grade product, which should 
render it biocompatible with cell culture.  This new material would allow 
me to make the key component in my integrated microfluidic device for 
neurophysiological studies.

5.  I plan on using this chemical only at the Headway to spin membranes on 
top of my silicon-photoresist molds.  I will pour about 3 milliliters of 
the liquid chemical on each silicon-photoresist mold and spin for 60 
seconds at the desired spin speed.  The molds will then be baked on a hot 
plate for 20 minutes at 75 degrees C.  These wafers will undergo no further 
processing at SNF.

6.  I am requesting to bring in 8 fluid ounces (~240 ml) of the chemical, 
which is a clear, viscous liquid.  Unlike PDMS, the silicone comes in one 
part, so no mixing is required.

7.  I would like to store my chemical at SNF, but would be willing to bring 
in a small vial of the liquid each time I go in the fab if local storage is 
denied for any reason by the Committee.  The material is flammable and 
should not be stored with strong acids, bases, or oxidizing agents.  The 
chemical should be stored with Storage Group L in the yellow solvent cabinet.

8.  There will be excess material collected on aluminum foil at the bottom 
of the Headway after spin coating.  This foil will be wrapped up and sealed 
in a ziploc bag, and like other flammable organics, will then be placed in 
the carboy underneath the Litho wet bench
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