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kbraun1-Visitor
1-Visitor
May 23, 2013
Question

CAS for non-leaded glass frits sought

  • May 23, 2013
  • 1 reply
  • 4295 views

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

1 reply

E
ebonneville1-Visitor
1-Visitor
May 24, 2013

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

J
jcholin1-Visitor
1-Visitor
May 28, 2013

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.

K
kbraun1-VisitorAuthor
1-Visitor
May 28, 2013

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

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