"Ron Capik" > wrote in message
news
> On 9/12/2011 2:53 AM, fratermus wrote:
>> On 09/11/2011 05:45 PM, Ron Capik wrote:
>>
>>> Pyrex™ is not (and never has been) white glass.
>>
>> My understanding is that it's no longer borosilicate.
>>
> Sadly that seems to be true. I did some checking since
> my first post and it seems they have been transitioning
> to tempered soda-lime glass for some time.
>
> Also, on reading up on the catastrophic failures it does
> sound like something has gone wrong in the tempering
> process or some such.
>
> I mostly worked with fused silica [quartz] in my lab
> so I had few worries about thermal stress. :-)
>
> ==

It has not been for the last 50+ years. Why the fuss now? Must have been a
competitor starting a bashing campaign.