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uPVC Window Terminology, Explained

Sash, mullion, beading, gasket, reinforcement — the words suppliers use, explained plainly so you can follow a quote.

The words that come up

Look for this

  • Sash — the moving part that holds the glass
  • Frame — the fixed outer surround
  • Mullion — a vertical bar dividing panes
  • Beading — the strip holding the glass in
  • Gasket — the rubber seal between parts
  • Reinforcement — steel inside the profile

Why the jargon matters

Understanding a few terms lets you read a quote and ask the right questions — especially about reinforcement, which is often where corners get cut invisibly.

Ask about the hidden parts

The parts you can't see — reinforcement and gaskets — matter most for how a window lasts. A supplier who explains them plainly is one worth trusting.

From our range

What we make

uPVC Sliding Windows

Multi-track windows that need no swing space.

uPVC Casement Windows

Side-hung sashes for full airflow and the tightest seal.

uPVC Performance Systems

Double-glazed acoustic and thermal windows.

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Tell us your openings and we'll measure on site, advise, and give you a real quote — factory-direct from our Pannimadai works in Coimbatore.