STM3163 Glass part 1 ASK

Main disadvantage of glass packaging?

• Breaks with rapid temperature change

• Chemically inert

• Can be re-used and re-cycled

• Impermeable to gases

Main advantage of glass packaging?

• Breaks with rapid temperature change

• Chemically inert

• Can be re-used and re-cycled

• Impermeable to gases

What is the chemical structure of glass?

• Almost ¾ is silicon

• Made from physical transformation above 1450-1500C

• Crystalline structure

• Quick cooling

Main reason for the fragility of glass?

• Continuous and rigid structure

• Strong covalent bond between silicon and oxygen

• Presence of sharp cracks and flaws

• Amorphous structure

Main factor that influences the thermal strength of glass?

• Thickness

• Chemical composition

• Surface treatments

• All of the above

Property of glass makes it transparent to microwaves?

• Amorphous structure

• Chemical inertness

• Electromagnetic property

• Thermal property

Main concern related to food contact with glass?

• Chemical reactions

• Leaching phenomena

• Presence of glass fragments

• Surface etching

Function of boron and aluminum in glass making?

• Improve thermal and mechanical resistance

• Reduce energy consumption

• Enhance transparency

• Remove gas from molten glass

purpose of annealing in glass container manufacturing?

• shape the final container

• strengthen the glass containers

• cool down the glass

• add a coating to the surface

purpose of chemical toughening in glass container manufacturing?

• shape the final container

• add a coating to the surface

• strengthen the glass containers

• cool down the glass