FREEMAN MARINE WINDOW SHAPES

WINDOW GLASS AND GLAZING TERMINOLOGY

GLASS, ELECTRICALLY HEATED - Performs like solid tempered safety glass, laminated in multiple layers.  The outer glass layer represents the monolithic load requirement as specified by the naval architect or the shipbuilder. Heating is achieved by supplying power to micro-fine tungsten wires arranged in the vinyl inter layer or to an electrically resistant coating on one of the glass surfaces. An applied electrical charge creates a heated surface able to de-mist or de-ice, depending on specifications.

GLASS, FIRE-RATED - Fire-rated glass may be of several different configurations depending on standards to be met. Depending on requirements, it may be: a specialty glass laminate in multiple layers with a special interlayer that expands when subjected to intense heat; wire reinforced float glass; one of several specialty configurations.

GLASS, INSULATED - Insulated glass refers to two pieces of glass spaced apart and hermetically sealed to form a single-glazed unit with an inert gas filled space between. Heat transmission through this type of glass may be as low as half that without such an air space. It is also called DOUBLE GLAZING or THERMOPANE GLASS.

GLASS, LAMINATED - Two or more sheets with an inner layer of transparent plastic. If impacted, the glass itself may crack, but the fragments tend to adhere to the plastic inter layer. By keeping the glass in its place, the protective inter layer provides added protection from dangerous flying or falling glass fragments. Used for overhead, safety glazing, and sound reduction.

GLASS, TEMPERED SAFETY - A heat-treated process that adds high strength to annealed float glass. When the glass breaks, fragments are small (less that 1/2" pieces). This type of glass is commonly used on pilothouse windows, portlights, and windscreens.

GLASS, THERMOPANE - See GLASS, INSULATED

GLASS, TINTED SAFETY - The addition of tinting adds glare and heat reduction features to a window. Standard tints available are green/blue (Solex™), gray and bronze. UV and light transmission specifications are available upon request. Normally specified as a percentage of tint, varying the thickness of the glass will make the tint appear lighter or darker (two pieces of glass that are of dissimilar thickness but with the same percentage of tint will appear to have a different tint).

PERSPEX - Polycarbonate lens.

SEALANTS AND TAPES FOR WINDOWS - Depending on the window application, sealants range from silicone to polyurethane. Butyl™ tapes are commonly used for most fixed glazing applications. Synthetic rubber, flock coated rubber material and water repelling felt are used in sliding window applications. UV resistant sealant is specified where necessary.