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A designer wants to use PLA for a part that will be exposed to sunlight outdoors. What is a key limitation of PLA for this use?

hard📝 Application Q9 of 15
3D Printing - Materials for 3D Printing
A designer wants to use PLA for a part that will be exposed to sunlight outdoors. What is a key limitation of PLA for this use?
APLA is waterproof and will not degrade
BPLA melts at very high temperatures outdoors
CPLA is highly flexible and will deform easily
DPLA degrades and becomes brittle under UV exposure
Step-by-Step Solution
Solution:

  1. Step 1: Identify PLA outdoor durability

    PLA is sensitive to UV light and can degrade, becoming brittle over time.

  2. Step 2: Evaluate options

    Only PLA degrades and becomes brittle under UV exposure correctly states PLA's UV weakness; others are incorrect or misleading.

  3. Final Answer:

    PLA degrades and becomes brittle under UV exposure -> Option D

  4. Quick Check:

    PLA UV limit = Degrades brittle [OK]
Quick Trick: PLA breaks down in sunlight, not ideal for outdoor use [OK]
Common Mistakes:
MISTAKES
  • Assuming PLA is waterproof
  • Thinking PLA is flexible outdoors

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