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Lab Practical - MMET 281 - Manufacturing and Assembly Processes II - Texas A&M University - TAMU - Dr. Bhaskar Vajipeyajula $12.49   Add to cart

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Lab Practical - MMET 281 - Manufacturing and Assembly Processes II - Texas A&M University - TAMU - Dr. Bhaskar Vajipeyajula

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Lab Practical - MMET 281 - Manufacturing and Assembly Processes II - Texas A&M University - TAMU - Dr. Bhaskar Vajipeyajula

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  • September 16, 2024
  • 16
  • 2024/2025
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  • Lab Practical - MMET 281
  • Lab Practical - MMET 281
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Lab Practical - MMET 281 - Manufacturing and

Assembly Processes II - Texas A&M University - TAMU -

Dr. Bhaskar Vajipeyajula



1. Define Heat Deflection

Answer The temperature at which a polymer of plastic sample deforms under a specified load.




2. Why is heat deflection useful?

Answer Because it gives an idea about how much of a load materials can withstand at elevated

temperatures




3. What are some products that would consider heat deflection in their de- sign?

Answer Tupperware containers

Microwave lining




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4. Define Melt Index (Plastic)

Answer Measure of the ease of flow of the melt of a thermoplastic polymer.




5. Why is Melt Index important?

Answer It gives an idea about how viscous a material is under a given load




6. When would you want a low MI plastic?

Answer For when molds are producing more flash than expected




7. When would you want a high MI plastic?

Answer For when there are larger and more complex molds




8. What effect does a high MI plastic have on density?

Answer Lowers density




9. What effect does a high MI plastic have on impact resistance?

Answer Lowers impact resistance


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10. What effect does a high MI plastic have on flexural properties?

Answer More flexibility




11. Why is it important to consider water absorption when processing a plas- tic?

Answer Because moisture can cause a change in product dimensions and material properties

such as electrical conductivity




12. How does one avoid the problems associated with water absorption when processing a

plastic?

Answer By applying a polymeric coating which will significantly reduce the amount of moisture

absorbed




13. What are two examples of chemically resistant plastics?

Answer PVC Plumbing PP Medical Implants




14. What are two examples of gas permeable plastics?

Answer Food Packaging Dialysis Machine Membranes


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