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Approximately how long ago were thermoplastics developed? (Obj. 31-1) a. 25 years b. 50 years c. 75 years d. 100 years 

   Approximately how long ago were thermoplastics developed? (Obj. 31-1)
a. 25 years
b. 50 years
c. 75 years
d. 100 years
Welding Principles and Practices ISE
Welding Principles and Practices ISE
EDWARD R. BOHNART 1st Edition
Chapter 31, Problem 1 ↓
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Approximately how long ago were thermoplastics developed? (Obj. 31-1) a. 25 years b. 50 years c. 75 years d. 100 years
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00:01 How long do plastics take to degrade completely? hundreds of years? a couple of years.
00:08 Dozens of years? or thousands of years? so the answer, just worth remembering, is hundreds.
00:14 It does vary a lot.
00:16 For example, a plastic bottle may be about 400 years.
00:22 So there are a lot of different plastics.
00:24 Some degrade faster...
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