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| Q. |
Polyurethanes plastics can be made in flexible foams even after belonging to thermosetting polymers. |
| A. | true |
| B. | false |
| C. | topic 5.2 injection moulding - plunger and screw machines |
| Answer» A. true | |
| Explanation: polyurethane plastics are belonged to the thermosetting plastics or polymers. polyurethane is the only polymer that can be formed in both rigid and flexible foams. the flexible polyurethane foam is generally used in the manufacturing of mattresses, carpets and furniture. and the rigid polyurethane foam is used in making of chairs and mirror frames. | |
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