Chapter 17: Glass and Glazing Flashcards Preview

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Flashcards in Chapter 17: Glass and Glazing Deck (24)
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1
Q

Glass sheet formed by spinning an opened hollow globe of heated glass; uses an iron rod called a “punty”

A

Crown glass

2
Q

Glass sheet produced by blowing a large, elongated glass cylinder, cutting off its ends, slitting it lengthwise, and opening it into a flat rectangle. It is swung like a pendulum and reheated to form the rectangular sheet.

A

Cylinder glass

3
Q

Which was preferred: crown or cylinder glass? Why?

A

Crown glass was favored for its surface quality, while cylinder glass was more economical.

4
Q

What is the modern-day glass production method?

A

Float glass: glass sheet is manufactured by cooling a layer of molten glass on a bath of molten tin.

5
Q

What is the difference between glass and glazing?

A

Glazing is a part of a wall or window made of glass. It is the opening and the installation.

6
Q

The act of installing glass in a glazed opening; as an adjective, referring to materials used in installing glass; the “glazier” is the installer

A

Glazing

7
Q

Individual pieces of glass

A

Lights/lites

8
Q

Glass is the most-used cladding material for tall buildings due to:

A
  • strength
  • lightweight
  • durability
  • wide range of available optical and thermal properties
9
Q

Glass is made from:

A
60% sand
Soda ash
Lime
Alumina
Potassium oxide
10
Q

When ordinary glass is cooled slowly under controlled conditions to avoid locked-in thermal stresses that might cause it to behave unpredictably in use.

A

Annealed glass

11
Q

Glass that is strengthened by reheating annealed glass and then cooling both surfaces rapidly with bursts of air (quenching)
This includes heat-strengthened and tempered glass.

A

Heat-treated glass

12
Q

Heat-treated glass that is stronger than heat-strengthened glass and may be used as safety glazing. It does not shatter into large, sharp shards, but into small granules with square edges. It is annealed glass which is cut, reheated, and cooled rapidly.

A

Tempered glass

13
Q

Glass or plastic balling material that, when broken, does not create hazardous shards. It is permitted for use in buildings at risk of occupant impact. It is most commonly tempered or laminated glass.

A

Safety glazing

14
Q

Heat-treated glass that is not as strong as tempered glass, and may not be used as safety glazing.

A

Heat-strengthened glass

15
Q

A glazing material consisting of multiple outer layers of glass sandwiched to an inner layer of transparent plastic. The polyvinyl butrayal (PVB) interlayer is bonded to the two outer layers under heat and pressure.

A

Laminated glass

16
Q

A glazing sheet with multiple laminations of plastic and glass. Designed to stop bullets.

A

Security glass

17
Q

The ratio of solar radiation tar passes through a glazing unit to the amount of lighting striking the unit, weighted to account for the relative fading damage potential of various wavelengths. The lower the Tdw, the better the protection against fading to interior fabrics and materials.

A

Damage Weighted Transmittance (Tdw)

18
Q

Glass strengthened by immersion in a molten salt bath, causing an ion exchange at the surface of the glass that creates a prestress in a manner similar to heat-treated glass

A

Chemically-strengthened glass

19
Q

What is the difference between fire-protection and fire-resistance glazing?

A

Fire-protection: used in fire doors, windows and other protected openings.

Fire-resistance: capable of substituting in full for solid, fire-resistance-rated wall assemblies. Unlike fire-protection rated glazing, resistance is not limited to use in doors, windows, or other openings. This glazing will not catch fire as quickly.

20
Q

Ground-up colored glass that is heat-fused to lines of glass to form functional or decorative patterns. It imprints the glass.

A

Frit

21
Q

Opaque glass manufactured especially or use in spandrel panels. Usually tempered or heat-strengthened with insulation behind it.

A

Spandrel glass

22
Q

Glass that is colored with pigments, dyes, or other admixtures (adding small amounts of chemical elements to the molten glass mixture)

A

Tinted glass

23
Q

Glass onto which a thin layer of metal or metal oxide has been deplored to reflect light and/or heat. Turns away significant portion of solar radiation.

A

Reflective coated glass/solar control glass

24
Q

A glazing unit made up of two or more sheets of glass with an airspace in between.

A

Insulating glass units (IGUs)