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Casting and Molding: Urethanes Vs. Composites Quiz

Shore A Urethanes are great for making:
A) Soft pliable prototypes
B) Large, durable molds
C) Flexible molds with negative angles
D) Both A and C
When drilling a shore A urethane use:
The same size bit as the hole needed
A larger bit than the size of the hole needed
You can’t drill shore A urethane
Smaller bit than the size of the hole needed
A benefit to using Shore D Urethanes for molds over composites is:
It has a faster demold time than composites so you can produce parts quicker
It has higher tensile strength
It has better strength to weight properties
They don’t last as long
4. How long before 60 shore D urethane resins reach their maximum properties?
1 day
14 days
7 days
Immediately after demolding
What is the mix ratio of the 75 shore D:
1:1
2:1
3:1
4:1
75 Shore D parts can be demolded in :
2.5-3 hours
1-2 hours
6-8 hours
3-4 hours
When deciding between urethanes and fiber- reinforced plastics to create a mold, what should be considered?
Cost
Finished surface appearance
Both A and B
Neither A or B
Which casting urethane would be best to create a softer, more resilient part?
60 Shore D
75 shore D
40 shore A
None of these
Why do we NOT recommend wax and PVA release for urethane parts?
It takes too long to apply
They are water based and can cause bubbling or pitting
They work just fine with urethane parts
You don’t need a mold release
How can you limit moisture contamination when using urethanes?
Use plastic or metal stir sticks and containers
Use wooden mixing sticks
Use wax lined containers
Use paper containers
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