The cooling duct is created with spacer bars made out of epoxy resin and fiberglass.
2.
Windows incorporating low emissivity glass, together with insulated spacer bars and extra deep window frames.
3.
A spacer bar may be used between the grinder and main spindle, allowing large ( 9 " radius or larger ) work to be completed.
4.
If the spacer bar or other edge condition connects the two lites of glass in a very rigid manner, bending stresses can develop which exceed the strength of the glass, causing breakage.
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