Page 549 - 04. Subyek Engineering Materials - Manufacturing, Engineering and Technology SI 6th Edition - Serope Kalpakjian, Stephen Schmid (2009)

Section 20.2 Subtractive Processes 529

TABLE 20.2
Mechanical Properties of Selected Materials for Rapid Prototyping
Tensile strength Elastic modulus Elongation in
Process Material (MPa) (GPa) 50 mm (%) Notes
Stereo- Somos 7120a 63 2.59 2.3-4.1 Transparent amber; good general-
lithography purpose material for rapid
prototyping
Somos 9120a 32 1.14-1.55 15-25 Transparent amber; good chemical
resistance; good fatigue properties;
used for producing patterns in rubber
molding
WaterClear Ultra 56 2.9 6-9 Optically clear resin with ABS-like
properties
WaterShed 11122 47.1-53.6 2.65-2.88 3.3-3.5 Optically clear with a slight green
tinge; mechanical properties similar to
those of ABS; used for rapid tooling
DMX-SL 100 32 2.2-2.6 12-28 Opaque beige; good general-purpose
material for rapid prototyping
Polyjet FC720 60.3 2.87 20 Transparent amber; good impact
strength, good paint adsorption and
machinability
FC830 49.8 2.49 20 White, blue, or black; good humidity
resistance; suitable for general-
purpose applications
FC 930 1.4 0.185 218 Semiopaque, gray, or black; highly
flexible material used for prototyping
of soft polymers or rubber
Fused- Polycarbonate 52 2.0 3 White; high-strength polymer suit-
deposition able for rapid prototyping and
modeling general use
ABS-M30i 36 2.4 4 Available in multiple colors, most
commonly white; a strong and
durable material suitable for general
use; biocompatible
PC 68 2.28 4.8 White; good combination of mechan-
ical properties and heat resistance
Selective laser Duraform PA 43 1.6 14 White; produces durable heat- and
sintering chemical-resistant parts; suitable for
snap-fit assemblies and sandcasting
or silicone tooling
Duraform GF 27 4.0 1.4 White; glass-filled form of Duraform
PA has increased stiffness and is
suitable for higher temperature
- applications
SOMOS 201 0.015 1 10 Multiple colors available; mimics
mechanical properties of rubber
ST-100c 305 137 10 Bronze-infiltrated steel powder
Electron- Ti-6Al-4V 970-1030 120 12-16 Can be heat treated by HIP to obtain
beam up to 600-MPa fatigue strength
melting

machining capabilities, prototypes can be produced in a few days to a few weeks.
Subtractive systems can take many forms; they are similar in approach to the manu-
facturing cells described in Section 39.2. Operators may or may not be involved,
although the handling of parts is usually a human task.