Tooling + Injection Molding Materials

As you consider your options for low-volume injection molding, talk to our experts. We can work with any production plastic material your project requires, but the most common options are listed below.

Tooling

Material Applications Rockwell Hardness Surface Finish
H-13 Steel Post-hardened steel for high volume molds 48-52 Rc Up to SPI A-1
Stainless Steel Post-hardened stainless steel for high volume molds 50-52 Rc Up to SPI A-1
P-20 Steel Pre-hardened tool steel for middle volume molds 28-32 Rc Up to SPI B-2
Nak 80 Steel Pre-hardened tool steel for middle volume molds 38-41 Rc Up to SPI B-2
S50C Steel Tool steel for low volume molds 20–24 Rc Up to SPI B3
718 Steel Tool steel for low volume molds 28-32 Rc Up to SPI C-1

Injection Molding Plastics

Material Description Tensile Yield
(0.125 in2)
Flexural Strength Flexural Modulus Izod Impact Strength
(Notched)
Heat Deflection
Under Load
Density
ABS Common thermoplastic with good impact resistance and toughness. 6,500 psi
(45 MPa)
11,700 psi
(80 MPa)
380,000 psi
(2,620 MPa)
5.5 ft-lb/in
(292 J/m)
190°F
(88°C)
0.0379 lb/in3
(1.05 g/cc)
Polypropylene Thermoplastic polymer used for a wide number of applications. 4,900 psi
(35 MPa)
26,100 psi
(180 MPa)
210,000 psi
(1,450 MPa)
0.6 ft-lb/in
(32 J/m)
219°F
(102°C)
0.0324 lb/in3
(0.90 g/cc)
Polyoxmethylene
(POM)
Dimensionally stable thermoplastic with high stiffness and low friction. 10,000 psi
(70 MPa)
14,000 psi
(100 MPa)
450,000 psi
(3,100 MPa)
1.41 ft-lb/in
(75 J/m)
216°F
(102°C)
0.0513 lb/in3
(1.42 g/cc)*
Polycarbonate Thermoplastic material with good temperature resistance and impact strength. 9,000 psi
(62 MPa)
18,000 psi
(124 MPa)
340,000 psi
(2,335 MPa)
15 ft-lb/in
(795 J/m)*
290°F
(143°C)
0.0434 lb/in3
(1.20 g/cc)
Polycarbonate / ABS Blend of PC and ABS that creates strong parts for a variety of applications. 8,000 psi
(55 MPa)
13,000 psi
(90 MPa)
370,000 psi
(2,550 MPa)
13 ft-lb/in
(689 J/m)
202°F
(94°C)
0.0415 lb/in3
(1.15 g/cc)
PVC PVC is a polymer with good insulation properties, high hardness, and good mechanical properties. 4,500 psi
(31 MPa)
7,150 psi
(50 MPa)
275,000 psi
(1,900 MPa)
15 ft-lb/in
(795 J/m)*
226°F
(108°C)
0.0487 lb/in3
(1.35 g/cc)
Nylon Polymer material that is durable with high elongation and good abrasion resistance. 8,400 psi
(58 MPa)
9,430 psi
(65 MPa)
175,000 psi
(1,200 MPa)
2.1 ft-lb/in
(111 J/m)
190°F
(88°C)
0.0411 lb/in3
(1.14 g/cc)
Nylon 32% Glass Fiber Polymer with excellent mechanical stiffness and elevated temperature resistance. 18,000 psi
(125 MPa)*
29,000 psi
(200 MPa)
900,000 psi
(6,200 MPa)*
2.5 ft-lb/in
(133 J/m)*
380°F
(193°C)
0.0498 lb/in3
(1.38 g/cc)
Acrylic (PMMA) Material with resistance to breakage often used for transparent applications. 9,400 psi
(65 MPa)
8,500 psi
(58 MPa)
250,000 psi
(1,725 MPa)
1.0 ft-lb/in
(53 J/m)
181°F
(83°C)
0.0422 lb/in3
(1.17 g/cc)
Styrene Light weight material popular for its high impact strength and toughness. 6,530 psi
(45 MPa)
9,510 psi
(65 MPa)
440,000 psi
(3,030 MPa)
1.9 ft-lb/in
(101 J/m)*
174°F
(79°C)
0.0379 lb/in3
(1.05 g/cc)
Polyether Imide
(PEI)
Thermoplastic with high heat resistance and excellent mechanical properties. 16,000 psi
(110 MPa)
24,000 psi
(165 MPa)
510,000 psi
(3,500 MPa)
1.0 ft-lb/in
(53 J/m)
400°F
(204°C)*
0.0549 lb/in3
(1.27 g/cc)*
* Exceptional Properties
Note: Material properties are for general reference purpose only. Actual values may vary based on specific material selected.

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