Potassium dichromate, CAS# 7778-50-9

Mary Tang mtang at stanford.edu
Wed Oct 7 12:30:58 PDT 2009


Hi Khanh --

As discussed, this should be fine.  However, please collect waste 
locally and label appropriately instead of using the HF drain.


Thanks,

Mary

Khanh Hoang wrote:
>
>  
>
> Hello Mahnaz and Marry,
>
>  
>
> I would like to bring a new chemical into the SNF lab.  Here is the 
> information:
>
>  
>
> (1)     Contact Information:
>
> ·         Name: Khanh Hoang
>
> ·         Coral login: khoang
>
> NanoGram Corp.
>
> 165 Topaz Street
>
> Milpitas, CA 95035
>
> Tel: (408) 719-5356
>
> Fax: (408) 262-6290
>
> Cell phone: (408) 786-6441
>
>  
>
> (2)     The chemical: Potassium dichromate;
>
>     * Synonyms: Potassium bichromate
>
>     * CAS#: 7778-50-9
>
>     * Storage group: *E* - Compatible Oxidizers, Organic Peroxides,
>       and Acids.
>
>     * Main hazard class: Oxidizers
>
>  
>
> (3)     Vendor/ Manufacturer info:
>
> ·         Vendor: Sigma-Aldrich, 
> http://www.sigmaaldrich.com/catalog/ProductDetail.do?lang=en&N4=483044|ALDRICH&N5=SEARCH_CONCAT_PNO|BRAND_KEY&F=SPEC 
> <http://www.sigmaaldrich.com/catalog/ProductDetail.do?lang=en&N4=483044%7CALDRICH&N5=SEARCH_CONCAT_PNO%7CBRAND_KEY&F=SPEC>
>
> ·         Phone: 800-325-3010
>
> (4)     Reason for request:
>
> ·         We will perform Secco etching on polycrystalline Si wafers 
> to etch defects.
>
> ·         Secco etch recipe: Mixture of *HF (48%)* + *K_2 Cr_2 O_7 * 
>  (*44 g K_2 Cr_2 O_7 * dissolved in *1 l* of the of *H_2 O, or 0.15 M) 
> in a ratio of 2:1*
>
>  
>
> (5)     Process flow:
>
>     * We will first dissolve Potassium dichromate with deionized water
>       in a HDPE (high density polyethylene) plastic bottle at the
>       chemicals handling bench (outside of the cleanroom).
>     * The solution will then be transferred by a staff member to the
>       Pass-through Carts.
>     * We will mix the solution with HF (48%) and perform the etching
>       process at the wbgen-hpr and use the Gold-contaminated labwares.
>     * After the etching process we will process the samples outside of
>       the cleanroom.  However the purity level of the purchased
>       potassium dichromate is greater than 99.99% trace metals basis.
>
>  
>
> (6)     Amount and form:
>
> ·         Amount: 44 grams
>
> ·         Form: solid
>
> ·         I will dissolve 44 grams in 1L of deionized water.
>
>  
>
> (7)     Storage: the potassium dichromate solution will be stored on 
> top of one of the Pass-through Carts or in the bulk storage area.
>
>  
>
> (8)     Disposal: the spent mixture of potassium dichromate solution 
> and HF will be disposed in the HF drain.  Excess or unused potassium 
> dichromate solution will be collected locally according to the SNF 
> regulation (disposed in a clean, empty waste container, attached to 
> the bottle with a filled hazardous waste disposal label, and place the 
> container on the hazardous waste shelf in the chemcial pass-through).
>
>  
>
> Please let me know if I can perform this task at SNF.
>
>  
>
> Thanks so much for your help,
>
>  
>
> Khanh Hoang
>
>  
>
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