Glass and Plasticware Flashcards
What are the categories of glasswares? (5)
- High thermal resistant glass
- High silica glass
- High alkali resistant
- Low actinic
- Soda lime
This type of glass contains borosilicate with low alkaline content. It is used in all purpose glassware.
High thermal resistance glass
The tolerance temperature and time for high thermal resistance glass.
510 degrees Celsius for a lengthy amount of time
What are the limitations of high thermal resistance glass? (3)
- Should not be cooled too quickly after heating
- May cloud after use with strong alkali
- It is subject to scratching
These brands of High thermal resistance glass are aluminosilicate in nature.
Corex and Vycor
Corex brand is commonly used for which types of laboratory apparatus?
Centrifuge tubes and thermometers.
What is the thermal capacity of Corex brand glasswares?
Stable up to 620 deg. Celsius up to 820 deg. Celsius for a short term use.
Which brand of High thermal resistance glass is resistant to scratching and subject to some acid or alkali attack at 100C?
Corex
Brand of high thermal resistance glass that is used for ashing and ignition.
Vycor
What is the temperature threshold of a Vycor brand high thermal resistant glass?
900-1200C
It is the most alkali resistant high thermal resistant glass brand.
Vycor
What is the percentage of silica in a High Silica Glass type of glassware?
96%
This glassware is used for cuvets and thermometers.
High Silica Glass
This type of glassware is radiation resistant, has good optical qualities, and could withstand decent temperature values.
High silica glass
This type of glassware contains aluminosilicate.
High Alkali Resistance Glass
High Alkali Resistance Glass is preferred to use with ______ _____.
Strong alkali.
Modified TRUE or FALSE, if FALSE look for the incorrect word/words:
High Alkali Resistance suffers maximal attack compared to borosilicate.
False. Maximal -> Minimal
What color is added to high thermal resistance to produce an integral part of the Low Acitinic Glass?
Red
Enumerate the uses of Low Acitinic Glass. (3)
Bilirubin, carotene, and vitamin A analysis.
Which type of glassware gives maximum protection to light-sensitive or photosensitive materials?
Low Actinic Glass
Modified TRUE or FALSE, if FALSE look for the incorrect word/words:
Soda lime glass is the most inexpensive type of glassware.
True
Modified TRUE or FALSE, if FALSE look for the incorrect word/words:
Plasticwares are highly resistant to corrosion and breakage but are expensive and non-disposable after each use.
False. Expensive -> inexpensive, non-disposable -> disposable
Enumerate the major types of resins. (7)
- Polystyrene
- Polyethylene
- Polypropylene
- Tygon
- Teflon
- Polycarbonate
- Polyvinylchloride
This plasticware is useful in both water and aqueous solutions.
Polystyrene
Modified TRUE or FALSE, if FALSE look for the incorrect word/words:
Polystyrene is not recommended for use with acids, aldehydes, ketones, ethers, hydrocarbons, or essential oils.
True
Discouraged time limit of storage when using polystyrene with alcohols and bases.
24 hours.
Polyethylene is excellently chemical resistant to most of which substances, except:
Aldehydes, amines, ethers, hydrocarbons, and essential oils.
Usage of this plasticware is limited to 24hrs in room tempt.
Polyethylene
Polypropylene has the same chemical resistance as ______ __________.
Linear polyethylene.
Modified TRUE or FALSE, if FALSE look for the incorrect word/words
Teflon is poor in chemical resistance to almost every chemical in the clinical lab.
False. Poor -> excellent
This type of plasticware is very susceptible to damage by most chemicals.
Polycarbonate.
Polycarbonate is resistant to which substances?
Water, aqueous salts, food, and inorganic acids.
