using resources Flashcards
1
Q
what are properties of low density polyethene?
A
- flexible
* used for bags and bottles
2
Q
what are properties of high density polyethene?
A
- more ridged
* used for water tanks
3
Q
how is LDPE made?
A
- moderate temperature
* high pressure
4
Q
how is HDPE made?
A
- lower temperature
* with catalyst
5
Q
what is difference between thermosofening and setting polymers?
A
- thermosofening have weak forces and can be melted and remoulded
- thermosetting have cross links and hard and strong
