Request for bringing new material (Pyralin Polyimide Coating and Pyralin Thinner)

Mary Tang mtang at
Mon Mar 2 14:26:57 PST 2009

Hi all --

I'll defer to Mahnaz for the final word, but this request looks fine to 
me -- with a couple of questions:

1.  PI 2545 is actually used by a number of people.  You might check 
with Mahnaz to find out if there is some available for your use, if you 
don't want to order it.  It lasts a long time.

2.  Your process flow does not mention adhesion promoter which some 
people find useful (it'sVM-651 or 652 and one is better than the other, 
although I don't remember which right now.  Other people in the lab will 
have this on hand, so you might want to ask around.)

3.  Your process flow does not mention curing of the polyimide (usually 
done in the BlueM oven) and if you plan further processing at SNF for 
these wafers.  If so, please let us know.

And a couple of reminders for bringing in and handling these materials 
in the lab:

4.  Follow all safety procedures in bringing in and storing personal 
materials.  (Contact Mahnaz or other staff member for the yellow label 
and barcode for personal chemicals.  You will have to log your chemicals 
under the barcode assigned to your chemicals on the logsheet.  Make sure 
to store these chemicals in the designated area of the Flammables 
cabinet or refrigerator as appropriate.)

5.  Follow all safety (all litho) handling procedures for volatile 
solvents in the lab.  (Use only at solvent-compatible stations.  Make 
sure to transport freshly spun/unbaked wafers in wafer boxes or other 
enclosed containers or risk the wrath of Uli.)

Unless other SpecMat'ers disagree, I believe what you have proposed is 
OK (provided you follow #4 and #5 above.)  However, if you plan further 
processing in the lab, please make sure to check/answer #2 and #3 above.



Zhiqiang Guo wrote:
> Hi, Mary:
> I have sent this email for bringing in personal material in SNF, those are common material, but not got reply, could you please tell me when I can receive the decision of the SpecMat committee?
> Thanks,
> Zhiqiang
> ----- Forwarded Message -----
> From: "Zhiqiang Guo" <zguo at>
> To: SpecMat at
> Sent: Friday, February 27, 2009 6:11:43 AM GMT -08:00 US/Canada Pacific
> Subject: Request for bringing new material (Pyralin Polyimide Coating and Pyralin Thinner)
> Hi, SpecMat Committee members:
> I apply for bring two materials into SNF, the two materials are all on MSDS Index at SNF. Because I need your decision then I can place an order, so could you please tell me your decision today, I will really appreciate your early decision?
> Please review the detailed information below:
> 1. Contact information:
>     Name: Zhiqiang Guo
>     Coral login: zguo
>     Phone(email): 650-723-3524 (zguo at
>     PI: Prof. Fu-Kuo Chang (Department of Aeronautics and Astronautics, Stanford University)
> 2. Material:
>    1) Common name: PI-2545
>       Trade name: Pyralin(R) Polyimide Coating
>       Components CAS numbers: 25038-81-7, 872-50-4, 64742-95-6, 95-63-6, 
>       usage: Coating polyimide film
>    2) Common name: T-9039
>       Trade name: Pyralin Thinner
>       Components CAS numbers: 872-50-4, 107-98-2 
>       usage: To thin the PI-2545 before coating
> 3. Vendor/manufacturer info(the same vendor): 
>    HD MicroSystems(TM)
>    Cheesequake Road
>    Parlin
>    New Jersey
>    USA 08859
>    phone: (800)346-5656
>    url:
> 4. Reason for request
>    In our process, we need to coat an thin polyimide film onto the surface of our device, seems there is no such material for common use in SNF, so I need to bring by myself.
> 5. Process Flow:
>    Start at 5 parts thinner T-9039 to 1 part PI-2545 (Lithosolv). After thinning run a spin coating(Headway2). The soft bake is done on a hot plate by 10' x 130C or convection oven by 30' x 135C (Blue M white). Coat with photoresist(svgcoat 1&2), expose the resist(EV or Karlsuss) and develop(svgdev 1&2). Remove the photoresist by using acetone(lithosolv or wbsolvent).
> 6. Amont and form:
>    1) PI-2545 for 250g, liquid in a bottle.
>    2) T-9039 for 1 liter, liquid in bottle.
> 7. Storage
>    1) PI-2545: group B (in refrige 0~4F)
>    2) T-9039: group B (Room temperature, below 90F )
> 8. Disposal
>    The liquid waste of those products are to be disposed into the solvent waster container in lito solvent benth. The baked polyimide film can be placed in a ziplock bag disposed in a hazardous waste container in the photolithography area.
> If you agree me to bring those two materials, could you please tell me where I can get the label and barcode?
> Thanks very much!
> Zhiqiang

Mary X. Tang, Ph.D.
Stanford Nanofabrication Facility
CIS Room 136, Mail Code 4070
Stanford, CA  94305
mtang at

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