Bent Metal Double Casement Window / Composite Aluminum Casement Windows

Bent Metal Double Casement Window / Composite Aluminum Casement Windows

Windows Sash component:

1.Glass:  Two sheets of glass for a double-paned window, one sheet for single panes.

2.Frame:  Frame is a convenient term for the wood, fiberglass, vinyl, or metal parts that hold the glass together.  It is actually composed of rails (horizontal pieces) and stiles (vertical pieces). 

3.Grille:  Within that frame may be smaller sections of window that go under different terms but collectively called grillework.  Older, single-pane windows may have true mullions, in which panes are separated by wood.  Newer double-pane windows may have a "mullion look," called GBG or grille-between-glass, in which false mullions are placed between the sheets of glass and serve no structural purpose.  GBGs provide aesthetic appeal and allow for easier cleaning of the glass.

4.Gaskets:  Glass must be sealed into the framework.  Gaskets made of rubber or TPVs (thermoplastic vulcanizates) serve this purpose.

5.Gas:  Arguably, this colorless, odorless gas injected between the sheets of gas for its insulating properties can be said to be an element of a window sash, too.  Single-pane windows have no gas.

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