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Hi Matej,

the Tk is given in Kelvins per millimeter, therefore
the less thickness, the more temperature resistance a 
given glass will prove.

The mechanical strength (against cracking) is proportional 
to the wall thickness, but, the amount of light absorbed too.

Quartz glass got the harder surface - less scratches tru 
abrasives like sand. 

Well, a wall thickness of 1,5 mm sounds way to thick to me.
Just take normal test tubes from the chem/pharma supplier
and get the excess length cut off.

Regards,
	Thomas.


> -----Original Message-----
> 
> What kind of glass shall be used for test tubes.
> 
> I am interested mostly about mechanical characteristics.
> 
> Wall thickness?
> 
> I can get Pyrex Test tubes or Test tubes made by glassblower 
> from Quartz glass. Wall thickness 1,5 mm. Glassblower advises quartz 
> glass, and he makes them optically very correct. Temperature  
> characteristics are also better.
> What about mechanical?
> 
> Which glass is most appropriate? Which one is the toughest 
> (hard to smash
> into pieces)?
> 
> Best regards
> Matej
> 
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