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GlassCatalogue_LowRes

Glossary Of Terms / E-F

Glossary Of Terms / E-F Edgebanding Method used to give the outside perimeter of the glass a protective coating to protect adhesives from UV rays. Usually done using ceramic inks on the glass which is then toughened. Edge cover The distance between the edge of the glass and the edge of the rebate forming the sight opening of the window frame. Edge lift Edge lift is a deviation that occurs at the edge of flat glass that has undergone heatstrengthening or tempering. The heat treatment process can cause the glass to bow or warp. Monitoring of edge lift is an important quality control parameter. Elastomer A rubbery material that returns to approximately its original dimensions in a short time after a relatively large amount of deformation. Elastomeric Being of an elastic, rubber-like substance, such as natural or synthetic rubber. This means that the material can move with the surrounding material without breaking down. Emissivity This describes the relative ability of the surface of a material to emit energy by radiation. For the glass industry, this term normally refers to the far-infrared energy band more commonly known as “heat” or “thermal” energy. Emissivity is the ratio of energy emitted by a surface relative to the energy emitted by a blackbody radiator heated to the same temperature. This value is dimensionless as it describes the ratio between these two measurements quoted as a value between 0.00 and 1.00. A true blackbody radiator will have a value of 1 which means it will re-emit all the energy it absorbs and a perfect reflector would have an emissivity of 0, absorbing nothing. The term “low emissivity” refers to surfaces with values close to 0, typically 0.02 to 0.2 in the glass industry. EPDM A synthetic rubber used to produce gaskets and setting blocks. Ethylene-Vinyl Acetate (EVA) Interlayer An elastic interlayer film based on the ethylene vinyl acetate copolymer. which is used to bond glass together in the laminating process. Excess Extra that is not needed. Face mitre The application of a mitred edge to the front surface of a pane of glass. 230 Product Catalogue For Glass Processors & IG Manufacturers

Glossary Of Terms / F Faceted glazing Glazing with vertical strips of glass (facets). The strips are joined at the vertical edges with silicone to typically form a radius window. Fading How materials lose colour. UV light plays a large part in this. Glass can be used to decrease the effect of UV light. Fenestration Any glass panel, window, door, curtain wall or skylight unit on the exterior walls providing windows to the building. Fiery Poorly annealed glass that results in poor cutting. Figured glass Glass that has a pattern on one side. Produced by molten glass passing between two rollers. The bottom roller is plain and the top roller puts the pattern on the glass. Also known as obscure glass. Finger slots Slots that are machined into the surface of the glass so that fingers may be used to move the glass. Finished size The finished size of the glass after cutting and processing is complete. Fins Supporting glass panels, usually vertical, located at a 90° to the glazed surface, usually behind a butt joint. Fire cracks Small cracks penetrating the surface of the glass usually in the shape of short hooked crescents. Fire-rated glass Glass that resists the penetration of flames and/or smoke for a period of time. Must be part of a fire rated system, in accordance with appropriate standards. Fire-resistant laminated glass Glass that resists the penetration of flames and/or smoke for a period of time. Must be part of a fire rated system, in accordance with appropriate standards. Fixing system A glass fixing system is the method by which a pane of glass or IGU is attached or fixed to the structure. Flare A protrusion on the edge of a panel of a glass. Email: info@fgtrading.co.za | Web: www.fgtrading.co.za 231