Use LEFT and RIGHT arrow keys to navigate between flashcards;
Use UP and DOWN arrow keys to flip the card;
H to show hint;
A reads text to speech;
3 Cards in this Set
- Front
- Back
|
Fire rated doors |
Class rating A - 3 hr, fire walls separating buildings or fire areas within a building, no glass permitted. B - 1.5hr, vertical enclosures (fire stairs and elevators), glass - 100 sq in/leaf (4in min dimension) C - 3/4 hr, corrdiors and partitions, (1296 sq in/light (54 in max dimension) D - 1.5 hr, exterior walls (extreme fire exposure), no glass permitted. E - 3/4 hr, exterior walls (moderate fire exposure), 720 sq in/light (54" max dimension) |
|
|
Glass types |
Float glass: most common type of glass. Measured in mm from 3 - 22 mm (1/8" to 7/8"). 6mm (1/4) is nominal. Patterned glass: different patterns, textures, and designs, all of which obscure vision and light transmission. Most common are ribbed, frosted, hammered, and fluted. Tempered glass: heat treated for increased impact resistance. Is 3-5 times stronger than plate glass but much more expensive. Used in doors and curtain walls and other areas accessible to the public. Cant be altered after manufacturing. Insulating glass: consists of two or more sheets of glass separated by a hermatically sealed air space to provide thermal, acousitcal control, and an absence of condensation. Can be manufactured in almost any type of glass. Cant be altered after manufacturing. Heat-absorbing glass (actinic glass): is tinted to absorb a high degree of solar radiation which transmits less solar radiation and glare into a building. Comes in gray, bronze, blue, and green in color. Reflective glass: consists of a reflective film laminated between two sheets of clear glass, or a thin film of metal oxide on the surface of the glass. Acts somewhat like a mirror reflecting heat and glare, and performs similar to heat-absorbing glass. Laminated glass: is composed of plastic sheets sandwhiched between two glass layers all bonded together under heat and pressure. When broken, plastic holds glass in place and thus reducing injury when breaking. Two types: safety glass, typically used in skylights and cars and bulletproof glass which is 4 or more layers of glass laminated to 3 or more layers of plastic. Wired glass: has wired mesh placed in the middle of glass during manufacturing process. It has high resistance to impact and remains intact after break. Used where fire resistance is required and in skylights or other overhead glazing. Mirrored glass: has reflective coating applied to one surface. One way glass: is mirrored on one side and transparent on the other as long as the light intensity is greater on mirrored side. Structural glass: used for exterior glass panels. |
|
|
Glazing plastics |
In recent years some plastics have replaced glass in window like applications such as skylights, translucent roof areas, fixed windows, interior partitions, luminous ceilings, etc. Made of acrylics, polycarbonates, polyesters, and polystyrenes are used. All available transparent, translucent, and opaque, and are all either fire-rated or classified as slow burning. Plastica in general could replace glass most applications where various transparent, obscure, or colored panels may be desired. But it is not as hard as glass and scratches easily, not as durable when exposed to normal use or to weather, plastic has high Coefficient of thermal expansion/contraction. Is typically more expensive, yet more resistant to fire and breakage, and it can be cut, bent and formed. |
