GLASSWARES

GLASSWARESGeromil J. Lara, RMT, MSMTGENERAL CATEGORIES OF GLASSBOROSILICATE GLASSMelts at temperature between 750 and 1,100 degrees CelsiusHard, free of heavy metalsResistant to thermal shock and alkaline corrosion

Used for heating and sterilization purposes.Commonly used glasswares.Composed of boron trioxide and silica.Low coefficients of thermal expansion resistant to thermal shock and alkaline corrosion.2GENERAL CATEGORIES OF GLASSBOROSILICATE GLASSUsed for situations involving sudden changes in temperature, an open flame, or electric heating elementsGENERAL CATEGORIES OF GLASSBOROSILICATE GLASSShould not be heated above its strain point PyrexCorexKimaxVycorGENERAL CATEGORIES OF GLASSBOROSILICATE GLASSPyrexStrain point of 515 degrees Celsius

GENERAL CATEGORIES OF GLASSBOROSILICATE GLASSCorexHigh-impact, extremely strong glass often used in the manufacture of centrifuge tubesWith aluminosilicate

High-impact, extremely strong glass often used in the manufacture of centrifuge tubesWith aluminosilicate

6GENERAL CATEGORIES OF GLASSBOROSILICATE GLASSVycorRecommended for use in application involving high temperature, drastic heat shock, and extreme chemical

Recommended for use in application involving high temperature, drastic heat shock, and extreme chemical.

7GENERAL CATEGORIES OF GLASSBOROSILICATE GLASSVycorUsed primarily in ashing and ignition techniques

GENERAL CATEGORIES OF GLASSBOROSILICATE GLASSVycorCan be heated to 900 degrees Celsius and can withstand downshocks from this temperature to ice water

GENERAL CATEGORIES OF GLASSSODA-LIME GLASSSometimes referred to as flint glassHas a high coefficient of expansionReadily attacked by alkaline solutionsGENERAL CATEGORIES OF GLASSSODA-LIME GLASSCommonly used for making volumetric flasks, stirring rods, and single-use pipets or tubesMinerals can be leached from the glass into the stored solutionsGENERAL CATEGORIES OF GLASSLOW ACTINIC GLASSUsed to reduce light exposure to its contentAmber-colored glass

GENERAL CATEGORIES OF GLASSHIGH SILICA GLASSSimilar to quartzAccurate spectrophotometer cuvettes

MEASURING VESSELSGRADUATED CYLINDERSSemi-accurateExtremely convenient for rapid measurement of liquid volumesShould never be heatedMEASURING VESSELSBURETSCan deliver any volume up to its maximum capacityUsed for titrationExtremely accurate in dispensing aliquots of a solutionAliquots Titration - 15MEASURING VESSELSVOLUMETRIC FLASKDesigned to prepare solutions of precisely known concentrations

Standard solutionsMEASURING VESSELSPIPETSUsed to transfer measured volumes of liquid between containersDesignDrainage characteristicsType MEASURING VESSELSPIPETSDesignTo Contain (TC) holds or contains a particular volume but does not dispense that exact volume

MEASURING VESSELSPIPETSDesignTo Deliver (TD) made by weighing the necessary volume of water which when allowed to flow by gravity will deliver the exact volume

MEASURING VESSELSPIPETSDrainage CharacteristicsTo 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 vesselself-draining

MEASURING VESSELSPIPETSDrainage CharacteristicsTo 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 itMEASURING VESSELSPIPETSMohr pipetDoes not have graduations to the tipself-draining pipet, but the tip should not be allowed to touch the vessel while the pipet is draining

MEASURING VESSELSPIPETSSerologic pipetHas graduation marks to the tip, and is generally a blowout pipet

MEASURING VESSELSPIPETSMicropipet With a total holding volume of less than 1 mLIt may be designed as either a Mohr or serologic pipet

MEASURING VESSELSPIPETSTransfer pipet Designed to dispense one volume without further subdivisionsOstwald-Folin PipetPasteur Pipet

MEASURING VESSELSPIPETSAutomatic and Semi-automatic pipet Commonly used in the clinical laboratory

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