GLASSWARES

Created by

mari

Cards (27)

most toxic plastics : polysterene , polyvinyl chloride , others
pasticwares are for testing heavy metals
polysterene are used in capped graduated tubes & test tubes
Polypropylene are primary constituent of pipet tips and cryogenic procedures
Polycarbonate are very strong plastic but NOT chemically-resistant
teflon is a tough insoluble polymer and almost chemically-inert and a Chemical-resistant
borosilicate glass has high degree of thermalresistance and low coefficient ofthermal expansion
strain point : certain glass viscosity is reached
HIGH SILICA GLASS is Silica fused to quartz and More expensive thanborosilicate glass
high silica glass is used in cuvettes and spectrometer
alumina-slicate glass is strengthened chemically ratherthan thermally
acid-resistant glass are also known as soft glass
hydrofluoric acid should not be with acid-resistant glass
low actinic glass contains materials thatusually impart amber to redcolor to the glass
For light-sensitivesubstances:• Bilirubin • Vit.A
Soda-Lime glass is the most inexpensive glass and readily made into variety of glassware
pipettes based on design: to contain and to deliver
pipette based on drainage characteristic: blow-out and self-drainage
pipette according to type: measuring and transfer
To Contain (TC) A.k.a. "Rinsed-out pipets"& Must be refilled and rinsed-out with theappropriate solvent after the initialliquid has been drained from the pipet
to contain pipets: Sahli-hemoglobin pipets , Long-Levy pipets
To Deliver (TD) Designed to drain by gravity , Must be held vertically with the tip placed against the side of the container and mustNOT TOUCH the liquid in it
to deliver pipet: Mohr pipet , Serologic pipet , volumetric transfer pipet
A TC pipet holds or contains aparticular volume but does notdispense that exact volume
whereas a TD pipet will dispensethe volume indicated.
Mohr pipet • NO graduations to the tip• Self-draining pipet
Serologic pipet • Has graduation marks to the tip• Generally a blowout pipet