Lab Practical - MMET 281 - Manufacturing and Assembly Processes II ... file:///C:/Users/HP/Desktop/New%20folder/Lab%20Practical%20-
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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,Lab Practical - MMET 281 - Manufacturing and Assembly Processes II ... file:///C:/Users/HP/Desktop/New%20folder/Lab%20Practical%20-
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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