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MUNTINS

A decorative design in cut-ups of glass lites, such as painted muntin grids (enamelite) applied to an interior lite of glass in a sealed insulating glass unit to simulate cut-ups of glass lites either in colonial or diamond patterns, or use of aluminum muntin bar between lites of glass in a sealed insulating glass unit […]

MULLION

An intermediate connecting member used to “marry” two or more windows or patio doors together in a single rough opening without sacrificing air or watertight performance. A mullion also can give added strength to the connection for structural stability.

MONOMER

A substance or simple chemical compound that can be polymerized, yielding a much larger molecule called a polymer.

MOISTURE VAPOR TRANSMISSION RATE

The rate at which moisture diffuses through a substance. Generally given in the following units: grams/meters2 x 24 hours. The lower the MVT rate, the greater the resistance of the sealant to moisture penetration.

MOCK-UP

A model of a section of a wall or its parts, built to scale or at full size, for purposes of studying its construction details, judging its appearance, and/or testing its performance.

MITRED CORNERS

The 45-degree butted flush joints produced in some sash where vertical jamb members meet horizontal head and sill members.

MIRROR MANUFACTURER

Manufacturer of mirrors. Involves a process called “Silvering”, where glass is coated (sprayed) with silver, then copper, then a paint (protective) backing.

MILL FINISH

The original finish produced on aluminum by cold rolling or extruding.

MASTIC

Descriptive of compounds that remain elastic and pliable with age.