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CC LAB > GENERAL CATEGORIES OF GLASS > Flashcards

GENERAL CATEGORIES OF GLASS Flashcards

1
Q

Most common type of glass encountered in volume measurements

A

Borosilicate

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2
Q

Composition of borosilicate

A

80% silica
13% boric oxide (BORON)
4% sodium oxide
2-3% Aluminum oxide

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3
Q

Characteristics
High degree of thermal resistance and low coefficient of thermal expansion

A

Borosilicate

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4
Q

– tendency of matter to change in shape, area, and even in volume, in response to a change in the temperature that it is subjected to

A

Thermal expansion

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5
Q

The low coefficient of thermal expansion also allows the manufacturing of these products –______ glasses – have heavy walls that will give it mechanical strength, even if it has thick or heavy walls, it will still retain reasonable heat-resistance

A

borosilicate

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6
Q

Low alkali content
Resistant to alkali corrosion

A

Borosilicate

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7
Q

Free of heavy metals
Free from Mg-lime-zinc group of elements, heavy metals, arsenic, and antimony

A

Borosilicate

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8
Q

Uses
Heating – open flame or electric heating elements

A

Borosilicate

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9
Q

It is at this point that all movement of the glass molecules has reached a point where no more strain can be introduced into the glass.

A

Strain point

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10
Q

Popular brands of borosilicate

A

Pyrex
Kimax

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11
Q

Pyrex: Strain point –
Kimax: Strain point –

A

515C (Henry)
513C

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12
Q

Silica fused to____
More expensive than borosilicate glass

A

quartz
High silica

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13
Q

Strengthened chemically rather than thermally

A

Alumina-silica or aluminosilicate glass

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14
Q

Aluminosilicate glass
With_____

A

aluminum oxide

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15
Q

Greater chemical durability and can withstand higher operating temperatures

A

Aluminosilicate

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16
Q

Compared to borosilicate,________ are more difficult to fabricate – thus it is not very common in the laboratory

A

aluminosilicates

17
Q

When coated with an electrically conductive film,_______ glass is used as resistors for electronic circuitry

A

aluminosilicate

18
Q

High-impact, extremely strong glass
Common use: manufacture of calibrated centrifuge glass
Centrifugal force tend to pull other glasses, thus_______ glass is utilized for centrifugation.

A

aluminosilicate

19
Q

Popular brand/s of aluminosilicate

A

Corex

20
Q

Characteristics;
✓ Radiation-resistant
✓ 6x stronger than borosilicate (outlast conventional glassware by 10-fold)
✓ Resist clouding and scratching better
Uses:
✓ High-precision analytical work
✓ Optical reflectors and mirrors
Not used as general type of glassware in the lab – a bit difficult to manufacture

A

Corex (Corning, N.Y.)

Aluminosilicate

21
Q

Non-laboratory uses
Outermost layer of our phone screens

A

Aluminosilicate

22
Q

Boron-free
AKA “soft glass”
Thermal resistant

A

Acid/ alkali resistant glass

23
Q

Acid/ alkali resistant glass popular brand

A

Vycor (No. 7900)

24
Q

made up of fused silica
2 in 1 characteristics – heat-resistant and chemically-inert
Unique characteristics
✓ Stable to all acids except hydrofluoric types
✓ Superior in resisting corrosion by alkali than borosilicate glass – no calibration markers
✓ Unlikely contamination by contact with solutions
✓ Relatively inert to acids and neutral salts
✓ Chlorine and acid gasses does not affect it at any temperature

A

Vycor

Alkali/ acid resistant glass

25
Q

Acid & Alkali resistant (Vycor)

Withstand high temperature
Softening temp:

A

1200*C

1500*C

26
Q

Withstand downshocks from this temperature to ice water

A

Acid/ alkali resistant

27
Q

Use
Ashing and ignition techniques

A

Acid/ alkali resistant

28
Q

Contains materials that usually impart amber to red color to the glass

A

Low actinic glass

29
Q

Reduces the amount of light transmitted to the substance in the glassware

A

amber to red color

Low actinic glass

30
Q

Commonly uses of low actinic glass

For light-sensitive substances:

A

Bilirubin
VIt. A (e.g., retinol glass)

31
Q

Low actinic glass

Store control materials and reagents (e.g.,)

A

formalin, acetone

32
Q

Soda lime also known as

A

Flint glass

33
Q

Composition of soda lime glass

A

Silicon oxide plus:
Soda – sodium oxide
Lime – calcium oxide

34
Q

Most inexpensive glass

A

Soda lime glass

35
Q

Readily made into a variety of types of glassware; kitchenware (ex. Wine glass)

A

Soda lime glass

36
Q

Has a high expansion coefficient and high degree of thermal resistance
Minerals can be leached from the glass into the stored solutions

A

Soda lime glass

37
Q

Soda lime glass in lab

A

Volumetric flask
Stirring rods
Single-use pipets or test tubes

CC LAB (46 decks)

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