CAS for non-leaded glass frits sought

[kbraun]

We have resistor suppliers submitting IPCs for non-leaded frits SiO2-Bi2O3-B2O3. I cannot find a CAS for this anywhere. Have you seen this disclosed? If so, what CAS do you use?

Thanks,

Kim

[ebonneville]

Hi Kim, according to our material expert, the best option is to get % of different substances (in the patents if available) - at the substance level, you will have CAS numbers

[jcholin]

I am surprised that the glass passivation is not leaded, from what I have heard most resistor companies are using leaded glass. The lead adds important electrical properties to the glass. I would like to know what manufacturer/resistor type you are using.

Either way, I used one of the discussion groups I am in in LinkedIn to find the following CAS#'s

• 65997-17-3 Glass, oxide, chemicals
• 56939-15-2 Lead Borosilicate
• 50815-87-7 Sodium borosilicate

Hope the above helps out, let me know if you need links to CAS# search tools, I've got a few that work OK.

[kbraun]

Thanks Jeffrey, the first one on your list may be the best bet. That or I may request our IT group create a custom SYSTEM CAS number for Glass Frits SiO2-Bi2O3-B2O3 and train our suppliers to use that.

Vishay, calls their products that don't claim RoHS exemptions as "Green". See this spec sheet for a "Green" resistor. http://www.vishay.com/docs/20047/rcge3.pdf on the top right of page 1 it has a link to their definitions of lead-free (termination only, exempted glass) version Green which utilized no exemptions.

I would love links to your CAS search tools. I typically use http://chem.sis.nlm.nih.gov/chemidplus/chemidheavy.jsp

[jcholin]

Kim,

Sorry for the tardy reply, I have had some health issues and quitefrankly this forum rarely give much useful feedback. The best sites for CAS# lookup in my book are:

http://iaspub.epa.gov/sor_internet/registry/substreg/searchandretrieve/substancesearch/search.do

http://www.commonchemistry.org/index.aspx

http://www.echemportal.org/echemportal/substancesearch/substancesearchresult.action?view=flat&queryTicket=SUBQ9fy&pageID=9&exactName=ZINC

There are CAS#'s for Glass Frits, they is 65997-18-4 (inorganic frits) , and 65997-17-3. There is also a CAS# for Lead Borosilicate which is 56939-15-2, but I have not gotten the details from the Chemical Abstract Service people as they want a blank check to do a search and I am not willing to sign one.

Let me know if you have any thoughts at jeffrey_cholin@bose.com

Also, have you heard of an upcoming CAB meeting, usually there is one about this time?

Jeff