Tech Support: Materials
SLA Resins
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POLYSTYRENE
PHYSICAL PROPERTIES
| Density |
0.0376-0.0387 lb/in3 |
| Water Absorption |
0-0.1 % |
| Moisture Absorption at Equilibrium |
0.04-0.1 % |
| Water Absorption at Saturation |
0.1 % |
| Linear Mold Shrinkage |
0.004-0.006 in/in |
| Melt Flow |
1.2-28 g/10 min |
MECHANICAL PROPERTIES
| Hardness, Rockwell M |
70-74 |
| Hardness, Rockwell R |
104-120 |
| Tensile Strength, Ultimate |
2600-10200 psi |
| Tensile Strength, Yield |
3630-10000 psi |
| Elongation @ break |
1-45 % |
| Elongation @ Yield |
1.5-2.2 % |
| Tensile Modulus |
260-490 ksi |
| Flexural Modulus |
390-479 ksi |
| Flexural Yield Strength |
7830-15000 psi |
| Compressive Yield Strength |
13100 psi |
| Poisson's Ratio |
0.33 |
| Izod Impact, Notched |
0.2- 2.38 ft-lb/in |
| Izod Impact, Unnotched |
2.06 ft-lb/in |
| Izod Impact, Notched Low Temp |
1.31 ft-lb/in |
| Charpy Impact, Unnotched |
3.81-13.3 ft-lb/in2 |
| Charpy Impact, Notched Low Temp |
0.476-0.952 ft-lb/in2 |
| Charpy Impact, Unnotched Low Temp |
4.28-4.76 ft-lb/in² |
| Charpy Impact, Notched |
0.952-1.9 ft-lb/in² |
| Gardner Impact |
4.43 ft-lb |
| Tensile Creep Modulus, 1 hour |
334000-479000 psi |
| Tensile Creep Modulus, 1000 hours |
319000-377000 psi |
ELECTRICAL PROPERTIES
| Electrical Resistivity |
1E+15-1E+17 ohm-cm |
| Dielectric Constant |
2-2.8 |
| Dielectric Constant, Low Frequency |
2-2.8 |
| Dielectric Strength |
500-3430 kV/in |
| Dissipation Factor |
0.00005-0.0004 |
| Dissipatin Factor, Low Frequency |
0.00009-0.0004 |
| Surface Resistance |
1E+13-1E+15 ohm |
| Arc Resistance |
100-180 sec |
| Comparative Tracking Index |
350-600 V |
| Hot Wire Ignition, HWI |
15 sec |
| High Amp Arc Ignition, HAI |
120 arcs |
| High Voltage Arc-Tracking Rate, HVTR |
4.72-11.8 in/min |
THERMAL PROPERTIES
| CTE, linear 200 C |
27.8-69.4 µ in/in-°F |
| CTE, linear 20° C Transverse to Flow |
38.9-50 µ in/in-°F |
| Heat Capacity |
0.287-0.502 BTU/lb-°F |
| Thermal Conductivity |
0.833-1.34 BTU-in/hr-ft²-°F |
| Melting Point |
374-500°F |
| Maximum Service Temperature, Air |
156-196°F |
| Deflection Temperature at 0.46 MPa |
172-217°F |
| Deflection Temperature at 1.8 MPa |
156-210°F |
| Vicat Softening Point |
33.9-230°F |
| Glass Temperature |
181-212°F |
| Flammability, UL94 |
HB |
| Oxygen Index |
18-19% |
OPTICAL PROPERTIES
| Haze |
0.65-1% |
| Transmission, Visible |
80-90% |
PROCESSING PROPERTIES
| Processing Temperature |
392-424°F |
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