Thermoplastics

Overview of thermoplastic resins like polyethylene, ABS, nylon, PTFE, polycarbonate and others commonly used in precision injection molding processes.

Thermoplastics Injection Molding

thermoplastic-injection-molding-service

Thermoplastics can be divided into general-purpose plastics, engineering plastics, and special plastics according to their performance characteristics, wide range of uses, and the versatility of molding technology. Neway's thermoplastics injection molding service offers superb quality, competitive price, fast turnaround, Etc. multi advantages

Common Thermoplastic Material Grade:

Thermoplastics Materials Optional for Injection Molding

Commodity thermoplastics:

Polyethylene (PE), polyvinyl chloride (PVC), polypropylene (PP), polystyrene (PS), acrylonitrile-butadiene-styrene (ABS)

Engineering Thermoplastics:

Nylon (Nylon), Polycarbonate (PC), Polyurethane (PU), Polyethylene Terephthalate (PET), Polyoxymethylene (POM)

High-Temperature Plastics:

Polyether Ether Ketone (PEEK), Polyimide (PI), Polyetherimide (PEI)

Specialty Plastics:

Polyphenylene Sulfide (PPS), Liquid Crystal Polymers (LCP), Polytetrafluoroethylene (Teflon, PTFE)

injection-molding-thermoplastic-materials

Material

Key Features

Typical Applications

Material

Key Features

Typical Applications

PE

Low cost, chemical resistance

Packaging, toys

PET

Clarity, barrier properties

Beverage bottles

PVC

Durability, hardness

Pipes, fittings

POM

Low friction, dimensional stability

Conveyor rollers, gears

PP

High strength, chemical resistance

Appliances, automotive parts

PEEK

Extreme temperature resistance

Aerospace, oil/gas industry

PS

Insulating, low cost

Disposable cups, packaging

PI

Chemical inertness

Aerospace composites

ABS

Toughness, easily molded

Appliance housings, auto parts

PEI

Flame retardancy

Electrical housings

Nylon

Wear resistance, low-friction

Gears, ball bearings

PPS

Chemically resistant

Fuel system components

PC

Impact strength, optical clarity

Lenses, protective gear

LCP

Extremely low friction

Miniature gears

PU

Cushioning, flexibility

Caster wheels, shoe soles

PTFE

Corrosion resistance, non-stick

Coatings, linings

Injection Molding Thermoplastic Comparison

Thermoplastic resin selection is a crucial step in developing quality injection molded parts. Comparing critical characteristics of different thermoplastics provides invaluable insights that enable the optimal material to be chosen for an application. Neway's thermoplastic comparison analyzes critical factors from mechanical properties to production costs, shedding light on how candidate resins stack up against the performance, manufacturing, and economic requirements.

Engineers can determine which resin will excel in the application by evaluating metrics such as tensile modulus, heat deflection temperature, melt flow index, and raw material prices across prospective plastics. Materials unfit for the product specifications or manufacturing methods are screened out, saving significant time and costs compared to trial-and-error testing.

Injection Molding Thermoplastic Physical and Mechanical Properties

Material

Tensile Strength (MPa)

Tensile Elongation (%)

Flexural Modulus (GPa)

Flexural Strength (MPa)

Izod Impact (J/m)

Heat Deflection Temp (°C)

Melt Flow Rate (g/10 min)

Shrinkage (in/in)

Density (g/cm3)

Commodity Thermoplastics

PE

26

500

0.7

18

50

65

2

0.02

0.96

PVC

56

50

3

68

15

70

15

0.04

1.4

PP

36

400

1.3

32

60

115

12

0.015

0.9

PS

50

2

2.5

60

40

90

15

0.5

1.05

ABS

40

35

2.5

60

400

90

20

0.5

1.05

Engineering Thermoplastics

Nylon

85

150

1.7

95

75

80

40

0.8

1.14

PC

65

50

2.3

100

800

145

25

0.6

1.2

PU

50

300

1.3

50

-

60

40

1

1.2

PET

60

150

2

95

50

90

15

0.35

1.35

POM

70

150

2.4

85

-

100

15

2

1.41

High-Temperature Plastics

PEEK

90

40

4.5

130

-

325

20

0.4

1.32

PI

80

100

3

140

-

275

30

0.25

1.44

PEI

85

75

2.5

165

-

210

20

0.2

1.27

Specialty Plastics

PPS

75

5

3.5

100

-

105

500

0.01

1.35

LCP

100

3

25

100

-

300

30

0.5

1.4

PTFE

25

300

0.5

20

-

95

200

2

2.2

Key Features and Applications of Thermoplastic

Commodity Thermoplastics:

  1. Polyethylene (PE):

  • Key Features: Lightweight, chemically resistant, good electrical insulator.

  • Applications: Packaging films, containers, pipes, toys.

  • Reasons: Economic, ease of processing, versatility.

  1. Polyvinyl Chloride (PVC):

  • Key Features: Good chemical resistance, flame retardant, weatherproof.

  • Applications: Pipes, cables, automotive interiors, footwear.

  • Reasons: Versatile, cost-effective, and durable.

  1. Polypropylene (PP):

  • Key Features: High impact strength, good fatigue resistance, chemically resistant.

  • Applications: Automotive parts, medical devices, packaging.

  • Reasons: Lightweight, easy to mold, recyclable.

  1. Polystyrene (PS):

  • Key Features: Transparent, good dimensional stability, easy to process.

  • Applications: Disposable cutlery, food packaging, electronic housings.

  • Reasons: Cost-effective, lightweight, versatility.

  1. Acrylonitrile-Butadiene-Styrene (ABS):

  • Key Features: Impact-resistant, good surface finish, readily colored.

  • Applications: Consumer electronics, automotive parts, toys.

  • Reasons: Strong, durable, aesthetic appeal.

Engineering Thermoplastics:

Nylon:

  • Key Features: High strength-to-weight ratio, wear-resistant, good chemical resistance.

  • Applications: Gears, bearings, automotive components.

  • Reasons: Toughness, fatigue resistance, engineering applications.

Polycarbonate (PC):

  • Key Features: High optical clarity, impact-resistant, flame-retardant.

  • Applications: Eyewear lenses, automotive headlamp covers, electronics.

  • Reasons: Transparency, toughness, thermal stability.

Polyurethane (PU):

  • Key Features: Flexible, abrasion-resistant, excellent cushioning properties.

  • Applications: Seals, gaskets, footwear, automotive components.

  • Reasons: Versatility, comfort, shock absorption.

Polyethylene Terephthalate (PET):

  • Key Features: Strong, transparent, excellent barrier properties.

  • Applications: Bottles, food containers, textiles.

  • Reasons: Lightweight, recyclable, clarity.

Polyoxymethylene (POM):

  • Key Features: Low friction coefficient, excellent dimensional stability, and a good electrical insulator.

  • Applications: Gears, bearings, medical devices.

  • Reasons: Wear resistance, low friction, precision.

High-Temperature Plastics:

Polyether Ether Ketone (PEEK):

  • Key Features: High-temperature resistance, excellent chemical resistance, strong mechanical properties.

  • Applications: Aerospace components, medical implants, industrial equipment.

  • Reasons: High performance, extreme conditions, durability.

Polyimide (PI):

  • Key Features: Exceptional heat resistance, excellent dielectric properties, low outgassing.

  • Applications: Aerospace components, electronics, semiconductor manufacturing.

  • Reasons: High-temperature stability, reliability, low thermal expansion.

Polyetherimide (PEI):

  • Key Features: High strength, excellent electrical properties, good chemical resistance.

  • Applications: Aerospace parts, electrical connectors, medical instruments.

  • Reasons: High performance, dimensional stability, flame resistance.

Specialty Plastics:

Polyphenylene Sulfide (PPS):

  • Key Features: Chemical resistance, flame resistance, high-temperature stability.

  • Applications: Automotive components, electrical connectors, industrial parts.

  • Reasons: Harsh environments, durability, electrical properties.

Liquid Crystal Polymers (LCP):

  • Key Features: High strength, low moisture absorption, excellent dimensional stability.

  • Applications: Connectors, electronic components, medical devices.

  • Reasons: Miniaturization, precision, high performance.

Polytetrafluoroethylene (PTFE) (Teflon):

  • Key Features: Excellent chemical resistance, low friction, non-stick properties.

  • Applications: Seals, gaskets, non-stick cookware, electrical insulation.

  • Reasons: Extreme chemical resistance, low friction, non-stick nature.

How to Select Thermoplastic for Injection Molding Parts

Define Requirements and Constraints:

Begin by defining the part's functional requirements, environmental conditions, and constraints. Consider mechanical strength, chemical exposure, temperature resistance, electrical properties, and regulatory standards.

Identify Material Candidates:

Based on the defined requirements, create a list of thermoplastic materials that align with the desired properties. Refer to the categories you've mentioned, including commodity thermoplastics, engineering thermoplastics, high-temperature plastics, and specialty plastics.

Analyze Mechanical Properties:

Evaluate the mechanical properties of the candidate materials. Compare tensile strength, flexural strength, impact resistance, and other relevant properties to ensure they meet the part's load-bearing and performance requirements.

Consider Thermal Properties:

Review the thermal properties of the materials, including heat deflection temperature, thermal conductivity, and coefficient of thermal expansion. Ensure the selected material can withstand the expected temperature variations.

Chemical Compatibility:

Examine the material's chemical resistance to substances the part might contact. Ensure the material remains stable and does not degrade when exposed to specific chemicals or environments.

Electrical Properties:

If the part requires electrical insulation or conductivity, verify the material's dielectric strength, electrical resistivity, and other electrical properties.

Processing and Design:

Consider the part's complexity, geometry, and design constraints. Evaluate the material's ease of processing, flow characteristics, and suitability for achieving the desired part geometry.

Aesthetics and Surface Finish:

If aesthetics are important, assess the material's ability to achieve the desired surface finish, color, and texture. Some materials are more suitable for achieving specific visual effects.

Cost Considerations:

Analyze the cost of the chosen materials, including raw material costs, processing costs, and any additional finishing or post-processing expenses.

Environmental Impact:

Consider the environmental impact of the chosen material, including recyclability, biodegradability, and sustainability.

Prototyping and Testing:

Before finalizing the material, consider creating prototypes using the selected materials. Test the prototypes for mechanical, thermal, and chemical performance to meet expectations.

Consult Experts:

Seek advice from Neway's injection molding experts and engineers knowledgeable about thermoplastics. They can provide valuable insights and recommendations based on their expertise.

Risk Management:

Identify potential risks associated with the selected material, such as potential degradation over time or unforeseen performance issues. Have contingency plans in place to address any challenges that may arise.


Why Neway for Thermoplastic Injection Molding

 

When it comes to thermoplastic injection molding, my experience with Neway has been exceptional. As a long-time customer, I've witnessed their dedication to quality and precision in every project. The 30 years they've spent in the industry reflect the expertise they bring to the table. Their diverse services cater to various needs, from metal injection molding (MIM) to ceramic injection molding (CIM). Their customer-first approach is awe-inspiring – their 20% discount on the first order is a testament to their commitment to building lasting relationships. Neway's reputation for reliability and excellence is well-deserved.

When OptoTech needed a partner for high-volume injection molding of tight-tolerance polymer components, they chose Neway. Advanced process controls and inspection procedures ensured zero defects. Neway's material selection expertise allowed parts to withstand challenging temperatures and chemical conditions. The ability to scale production and deliver on aggressive deadlines was instrumental in OptoTech's product launch success. According to the CEO, partnering with Neway gave them a competitive edge.

Are you looking to take your product to the next level? We should chat about Neway's thermoplastic injection molding! I guarantee their 30+ years of expertise can meet your plastic manufacturing needs, whether MIIM, PCM, or CIM, you name it. Plus, you can test them out with 20% off your first order. Want to learn more? Just shoot me a message, and let's talk!

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