GLASS

How many years ago did How many years ago did humans start making glass?humans start making glass?

800 years800 years 1200 years1200 years 2000 years2000 years 3500-4500 years3500-4500 years

Glass is made from 3 Glass is made from 3 principal ingredients:principal ingredients:

Silica Sand

LimestoneLimestone

Limestone karsts in Limestone karsts in ChinaChina

Soda Ash Soda Ash

How glass is madeHow glass is made

The batch of The batch of ingredients is heated ingredients is heated to up to 2800 degrees to up to 2800 degrees Fahrenheit.Fahrenheit.

Once melted and Once melted and transparent, the batch transparent, the batch is cooled to 180 is cooled to 180 degrees F and moved degrees F and moved into a glass forming into a glass forming machine.machine.

GLASSGLASS

Some old school glass Some old school glass factories..factories..

A modern day glass factory

Why recycle glass?Why recycle glass?

1 ton of recycled glass 1 ton of recycled glass saves 1.2 tons of raw saves 1.2 tons of raw materialmaterial

Adding “cullet” the Adding “cullet” the batch greatly reduces batch greatly reduces energy usage, water energy usage, water consumption, and air consumption, and air emissions.emissions.

Glass remains in Glass remains in landfills indefinitely.landfills indefinitely.

The following things, even in small The following things, even in small amounts, can contaminate an entire load amounts, can contaminate an entire load

of recycled glass:of recycled glass: Ceramics (plates, coffee mugs)Ceramics (plates, coffee mugs) Window glass and mirrorsWindow glass and mirrors Plastic, tin, aluminum lids/tabsPlastic, tin, aluminum lids/tabs Pyrex glassPyrex glass Wired glassWired glass Crystal and drinking glassesCrystal and drinking glasses Light bulbs or tubesLight bulbs or tubes

Only in Vegas….Only in Vegas….

Follow Up Quiz…Follow Up Quiz…

What are the three What are the three main ingredients of main ingredients of glass?glass?

A) Silicone, Limes, Soda cansA) Silicone, Limes, Soda cans B) Lava, Petroleum, LeadB) Lava, Petroleum, Lead C) Plastic, Rubber, GravelC) Plastic, Rubber, Gravel D) Limestone, Soda Ash, Silica SandD) Limestone, Soda Ash, Silica Sand E) All of the aboveE) All of the above

Once you have the raw ingredients, what Once you have the raw ingredients, what condition is necessary to produce glass?condition is necessary to produce glass?

A) A relaxed, serene state of mindA) A relaxed, serene state of mind B) A good offensive lineB) A good offensive line C) A giant freezing systemC) A giant freezing system D) A whole lot of heatD) A whole lot of heat E) A perfect driving recordE) A perfect driving record

What are the benefits of recycling glass?• A) Saves raw material• B) Greatly reduces energy use• C) Reduces air pollution• D) Conserves water• E) All of the above

Which of the following types of Which of the following types of glass cannot be recycled?glass cannot be recycled?

A) Glass jarsA) Glass jarsB) Drinking glassesB) Drinking glassesC) Light bulbsC) Light bulbsD) Broken beer bottlesD) Broken beer bottlesE) B & CE) B & C

Any Questions?Any Questions?

Remember: Blue glass gets sorted with Remember: Blue glass gets sorted with brown!brown!

Always wear eye protection when sorting Always wear eye protection when sorting or dumping glass, and if you want to enjoy or dumping glass, and if you want to enjoy music into your old age, you should wear music into your old age, you should wear ear protection too!ear protection too!