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   Eric Stevens wrote on 9/13/2021 12:01 AM:   
   > Molten glass plus a whole lot of contaminants. Glass fibres have to be   
   > defect free. They can't include contaminants.   
      
   My post was in reply to your claim that "I don't see how they can be   
   stripped from their resin without physical damage or leaving residue of   
   the resin on the fibres".   
      
   In my last post I have described a simple process that the resins can be   
   separated from the fiberglass using solvent, high temperature, and   
   hydraulic press.   
      
   The resultant dirty fiberglass can be purified by melting the fiberglass   
   back into glass. The process will purify the glass because the residual   
   resin will be burned off.   
      
   Do you know that glass is a byproduct of extracting iron from iron ore?   
   Iron ore is definitely a lot dirtier than the recovered fiberglass from   
   the resin."   
      
      
   This article describes how glass is made from sand:   
      
   https://www.explainthatstuff.com/glass.html   
      
   "In a commercial glass plant, sand is mixed with waste glass (from   
   recycling collections), soda ash (sodium carbonate), and limestone   
   (calcium carbonate) and heated in a furnace. The soda reduces the sand's   
   melting point, which helps to save energy during manufacture, but it has   
   an unfortunate drawback: it produces a kind of glass that would dissolve   
   in water! The limestone is added to stop that happening. The end-product   
   is called soda-lime-silica glass. It's the ordinary glass we can see all   
   around us."   
      
   --- SoupGate-Win32 v1.05   
    * Origin: you cannot sedate... all the things you hate (1:229/2)