5 General Types of Glass

1. High thermal resistant glass

   • borosilicate glass with low alkali content

   • resists heat corrosion and thermal shock

   • pyrex kimax exax corex

   a. Corex

   • 6x stronger than borosilicate glass

   • alumina-silicate glass

   • better able to resist clouding due to all alkali or scratching

   • ideal for higher temperature thermometers graduated cylinders and centrifuge tubes

   b. Vycor

   • application involving high temperature and drastic heat schock and extreme chemical treatment with acids and dilute alkalies

   • heatable to 900 C and withstand downshock from 900 C to ice water

   • ideal fro ashing and ignition technique

2. High Silica Glass

   • 96% silica content comparable to fused quarts in its thermal endurance chemical stability and electrical characteristics

   • radiation resistant good optical qualities and temperature capabilities

   • ideal for high precision analytical work and can also be used for optical reflectors and mirrors

3. Glass with high resistance to alkalies

   • boron-free glassware for strong alkali solutions and digestion with strong alkalies

   • less thermal resistant than borosilicate glass

   • soft glass

4. Low actinic glass

   • amber or red-colored to reduce the amount of light passing through the substance within the glassware

   • highly protective laboratory glassware for handling heat-labile substances in the 300-500nm range (bilirubin carotene vitamin A)