Question

sls: materials
use the information below to answer the question.
when deciding what materials are suitable for selective laser sintering, you want a material that has good thermal resistance.

types of materials
nylon is a polyamide (thermoplastic), which can be re - melted. these properties make nylon a good choice of material for the sls process.

pa 12 nylon has good strength, cost - effectiveness, and chemical resistance. it has a matte, rough surface.

alumide has a dull gray metallic appearance and good temperature resistance.

pa - gf is a glass - filled nylon that has a good strength - to - weight ratio, and good wear resistance.

characteristics of pa 12
pa 12 has good characteristics that make it good for a range of applications.
mechanically, it has good impact resistance and good moisture resistance. it also has good chemical resistance along with good heat resistance. the mechanical properties of pa 12 can be further enhanced with the addition of carbon, glass, or aluminum to increase the tensile strength.

functionality of pa 12
...
which of the following sls materials has a dull gray metallic appearance and good temperature resistance?
options: alumide, pa - 12 nylon, resin, pa - gf nylon

Explanation:

We analyze each option:

• PA - 12 nylon: Properties include being a polyamide (thermoplastic), re - meltable, good for SLS, but no mention of dull gray metallic appearance.
• Resin: No relevant description matching the required appearance and temperature resistance.
• PA - GF nylon: A glass - filled nylon with good strength - to - weight ratio and wear resistance, not matching the appearance.
• Alumide: The text states "alumide has a dull gray metallic appearance and good temperature resistance".

Answer:

A. alumide