02 glasswares
TRANSCRIPT
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GLASSWARES
Geromil J. Lara, RMT, MSMT
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GENERAL CATEGORIES OF GLASSBOROSILICATE GLASS Melts at temperature between 750 and 1,100 degrees Celsius
Hard, free of heavy metals Resistant to thermal shock and alkaline corrosion
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GENERAL CATEGORIES OF GLASSBOROSILICATE GLASS
Used for situations involving sudden changes in temperature, an open flame, or electric heating elements
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GENERAL CATEGORIES OF GLASSBOROSILICATE GLASS
Should not be heated above its strain point Pyrex® Corex® Kimax® Vycor®
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GENERAL CATEGORIES OF GLASSBOROSILICATE
GLASS Pyrex®
Strain point of 515 degrees Celsius
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GENERAL CATEGORIES OF GLASSBOROSILICATE GLASS Corex®
High-impact, extremely strong glass often used in the manufacture of centrifuge tubes
With aluminosilicate
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GENERAL CATEGORIES OF GLASSBOROSILICATE GLASS Vycor®
Recommended for use in application involving high temperature, drastic heat shock, and extreme chemical
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GENERAL CATEGORIES OF GLASSBOROSILICATE GLASS Vycor®
Used primarily in ashing and ignition techniques
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GENERAL CATEGORIES OF GLASSBOROSILICATE GLASS Vycor®
Can be heated to 900 degrees Celsius and can withstand downshocks from this temperature to ice water
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GENERAL CATEGORIES OF GLASSSODA-LIME GLASS Sometimes referred to as flint glass
Has a high coefficient of expansion
Readily attacked by alkaline solutions
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GENERAL CATEGORIES OF GLASSSODA-LIME GLASS Commonly used for making volumetric flasks, stirring rods, and single-use pipets or tubes
Minerals can be leached from the glass into the stored solutions
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GENERAL CATEGORIES OF GLASSLOW ACTINIC
GLASS Used to reduce light exposure to its content
Amber-colored glass
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GENERAL CATEGORIES OF GLASSHIGH SILICA GLASS Similar to quartz
Accurate spectrophotometer cuvettes
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MEASURING VESSELS
GRADUATED CYLINDERS Semi-accurate Extremely convenient for rapid measurement of liquid volumes
Should never be heated
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MEASURING VESSELS
BURETS Can deliver any volume up to its maximum capacity
Used for titration Extremely accurate in dispensing aliquots of a solution
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MEASURING VESSELS
VOLUMETRIC FLASK Designed to prepare solutions of precisely known concentrations
Standard solutions
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MEASURING VESSELS
PIPETS Used to transfer measured volumes of liquid between containers Design Drainage characteristics Type
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MEASURING VESSELS
PIPETS Design
To Contain (TC) holds or contains a particular volume but does not dispense that exact volume
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MEASURING VESSELS
PIPETS Design
To Deliver (TD) made by weighing the necessary volume of water which when allowed to flow by gravity will deliver the exact volume
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MEASURING VESSELS
PIPETS Drainage Characteristics
To Deliver (TD) Those with a single painted or frosted ring at the top should be allowed to simply drain with the tip placed against the side of the receiving vessel
self-draining
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MEASURING VESSELS
PIPETS Drainage
Characteristics To Deliver (TD)
Those with double rings are designed to be "blown out" by pushing a small amount of air out of the pipet, completely emptying it
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MEASURING VESSELS
PIPETS Mohr pipet
Does not have graduations to the tip
self-draining pipet, but the tip should not be allowed to touch the vessel while the pipet is draining
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MEASURING VESSELS
PIPETS Serologic pipet
Has graduation marks to the tip, and is generally a blowout pipet
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MEASURING VESSELS
PIPETS Micropipet
With a total holding volume of less than 1 mL
It may be designed as either a Mohr or serologic pipet
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MEASURING VESSELS
PIPETS Transfer pipet
Designed to dispense one volume without further subdivisionsOstwald-Folin PipetPasteur Pipet
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MEASURING VESSELS
PIPETS Automatic and Semi-
automatic pipet Commonly used in
the clinical laboratory