Recycled PET loses about what percent of its mechanical properties each time its reused?    a. 15% b. 10% c. 5% d. 20%

To answer the question regarding the loss of mechanical properties of recycled PET each time it is reused, let's analyze the provided options.

1. At least 5% Loss: It is recognized that recycled PET does experience some degradation in its mechanical properties due to the repeated melting and processing involved in recycling.

2. Common Estimates: Research generally indicates that the loss of mechanical properties tends to be around 10% to 15% per reuse cycle for PET.

3. Considering Available Answers:

   • a. 15%
   • b. 10%
   • c. 5%
   • d. 20%

Since the loss typically falls within the range of 10% to 15%, we can narrow down the options.

• 5% seems to be an underestimate.
• 20% may be considered excessive.

Conclusion:

Given the common estimates from various studies, the best answer among the choices provided would be a. 15% or b. 10%, with a. 15% being a commonly cited figure in some literature sources regarding recycled PET.

Thus, if I have to choose the answer that aligns closely with common findings, I would select:

Final Answer

a. 15%