Bristles of tooth brushes are made of_______________?
Correct answer: B. Nylon-66
- A. Nylon-6
- B. Nylon-66
- C. Polystyrene
- D. PVC
Explanation
Nylon-66 has good toughness, abrasion resistance and dimensional stability, making it suitable for toothbrush bristles. Nylon-6 is also used in fibres, but Nylon-66 is the conventional answer for this application.
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