When it comes to plastic injection molding, these are some common plastic materials used:

• Crystalline Plastics
• Amorphous Plastics
• Imidized Plastics
• Polyethylene (PE)
• Polypropylene (PP)
• Acrylonitrile Butadiene Styrene (ABS)
• Polyoxymethylene (POM)
• Polystyrene (PS)
• Resin
• Nylon
• Polycarbonate(PC)
• PC-ABS plastic
• Thermoplastic Rubber
• Fiber Reinforce Plastic
• Glass Filled Nylon
• Acrylic (PMMA)
• Polyether Ether Ketone (PEEK)

However, the options extend beyond mere variety, necessitating a thoughtful selection process for the ideal plastic material in custom injection molding endeavors. Each plastic material boasts distinct visual and behavioral characteristics owing to its unique chemical compositions. To ensure suitability for a specific part's intended purpose and functionality, critical material properties like strength, flexibility, performance, texture, density, and color demand careful consideration.

Moreover, meticulous attention to the shrinkage and mold flow rate of each material is paramount. Comprehending these factors aids in averting unwanted flaws such as warping, sink marks, or streaks in color, which could adversely impact the part's dimensions, tolerances, and surface quality.

It's crucial to account for the shrinkage rate of the injection molding material. Should initial production utilize one plastic material, switching to a different one for subsequent runs may influence the part's dimensions due to differing shrink rates among materials. This consideration is pivotal in maintaining consistency and precision across production cycles.

Injection molding is a widely used technique for manufacturing thermoplastics, which are versatile materials that can be melted, reshaped, and solidified multiple times. Selecting the right material for injection molding can be challenging due to the abundance of plastic polymers available.

These materials offer diverse properties and functionalities, catering to various specific needs and applications.

Lingshantech offers a wide variety of materials for injection molding. Additionally, if you need a material that’s not listed, contact our sales engineers and we will work with you to obtain your specific plastic resin material.

Crystalline Plastics

Crystalline plastic exhibit excellent resistance against thermoforming, fatigue, stress, and various chemicals. They possess an opaque appearance, making them challenging to bond, yet excel in applications requiring wear resistance and bearing capabilities. Despite their cost-effectiveness, these plastics tend to offer lower strength and are best suited for use in relatively moderate-temperature environments (up to 180 degrees Fahrenheit). Examples of common crystalline thermoplastic polymers encompass:

• High-density polyethylene (HDPE)
• Low-density polyethylene (LDPE)
• Polypropylene (PP)
• Polyethylene (PE)

Ascending within the realm of crystalline plastics, engineering-grade materials typically incur higher costs compared to commodity resins. They occupy a mid-level position in terms of strength, stiffness, and pricing, offering commendable chemical resistance and a moderate operational temperature range (up to 200 degrees Fahrenheit). Among these are thermoplastics categorized as:

• Polyoxymethylene (POM, a.k.a. acetal)
• Polyamide (PA, a.k.a. nylon)
• Polybutylene terephthalate (PBT)
• Polyethylene terephthalate (PET)

Advanced high-performance plastic resins, while pricier, boast heightened purity levels and deliver superior performance in terms of chemical resistance, along with an extended temperature tolerance of up to 300 degrees Fahrenheit. Examples of these top-tier materials comprise:

• Perfluoroalkoxy (PFA)
• Polyvinylidene fluoride (PVDF)
• Polyphenylene sulfide (PPS)
• Polytetrafluoroethylene (PTFE)

Amorphous Plastics

Within the comparison chart delineating plastic resin performance characteristics, one finds a category dedicated to common amorphous plastics, which starkly differ from their crystalline counterparts. Amorphous resins showcase distinct traits—poor chemical and fatigue resistance, susceptibility to stress fractures, and a transparent nature, in contrast to the opaque quality of crystalline plastics.

However, these resins present advantageous properties such as thermoformability, adhesive bonding capabilities, and suitability for structural applications. Despite being cost-effective, they offer favorable attributes like excellent bondability and machinability. Conversely, drawbacks include lower strength and a limited temperature range, akin to crystalline commodity plastics, topping out at 180 degrees Fahrenheit. Inexpensive, commodity-grade amorphous resins encompass:

• Acrylonitrile butadiene styrene (ABS)
• Polystyrene (PS)
• Poly(methyl methacrylate) (PMMA, a.k.a. acrylic)
• Polyethylene terephthalate glycol (PETG)
• Polyvinyl chloride (PVC)

Advancing to the category of engineering-grade amorphous plastics, these materials are renowned as versatile general-purpose plastics, offering moderate strength and a temperature tolerance of around 200 degrees Fahrenheit. They boast ease of fabrication, commendable stability, and exhibit favorable Izod impact resistance. Notable examples among engineering-grade amorphous polymers include:

• Polycarbonate (PC)
• Polyurethane (PUR or PU)

Amidst the high-cost, high-performance category, amorphous resins stand out for their exceptional resistance to hot water and steam, tailored for demanding high-temperature applications, extending up to 300 degrees Fahrenheit. Renowned for their superior thermoformability and remarkable strength, plastics within this classification encompass:

• Polyphenylsulfone (PPSU, a.k.a. Radel R®)
• Polyetherimide (PEI, a.k.a. Ultem®)
• Polysulfone (PSU)

The provided table delineates the injection molding material grade, outlining their specific characteristics, sample applications, and additional pertinent details for each material. To navigate through this database, utilize the search function located in the upper left-hand corner, allowing a comprehensive search across the entire database. Alternatively, refine your search by selectively checking the boxes that align with your product's requirements.

Imidized Plastics

At the summit of the chart lie imidized materials, distinguished as top-tier high-performance plastics. These materials excel with an exceptional maximum service temperature of 500 degrees Fahrenheit, albeit with a corresponding premium cost. Renowned for their robust resistance to chemicals, they exhibit remarkable strength, stiffness, and the ability to withstand high loads. Imidized materials encompass:

• Polyamide-imide (PAI)
• Polybenzimidazole (PBI)
• Polyimide (PI)

Common Plastic Materials to Fit a Wide Range of Applications

Selecting the appropriate plastic material for your components holds utmost significance. The choice of material should align with the intended use of the part, ensuring its capability to endure the diverse conditions it will encounter. While certain applications demand specialized, high-performance, and relatively expensive materials, many can sufficiently utilize one of the prevalent, cost-effective, commodity plastic materials. Below are five of the most widespread plastic resins:

Acrylonitrile Butadiene Styrene (ABS)

ABS stands for Acrylonitrile butadiene styrene. This is a typical thermoplastic type of injection moulding material that’s in pipes, automotive body parts as well as keyboards.
Along with its good properties,ABS has many benefits, for example, having high impact resistance makes it hard to break due to the material being sturdy whilst being lightweight. It also can withstand heat and reach high temperatures.
However, one impact is that it can scratched easily which makes it very delicate when used. Furthermore, it can be very damaging to the environment since it’s made out of oil and in production creates hot plastic fumes.

Properties

ABS stands out for its strength and impact resistance, yet it demonstrates limited resilience against sunlight (UV), water, and adverse weather conditions. When compared to acrylic, injection-molded ABS isn't an optimal choice for outdoor applications. Notably, ABS emits considerable smoke when burned and, unlike nylon, exhibits subpar resistance to high friction.
What is the Molding Temperature for ABS Plastic?
ABS has a low melting or molding temperature, making it ideal for injection molding. The process temperature is approximately 40-80 °C, preferably as high within that range as possible. Using a higher mold temperature tends to lengthen the molding cycle time, so the mold temperature setting depends on what is most appropriate for the individual product that is to be molded.

Benefits
Tough, impact- and chemical-resistant, low shrink, high dimensional stability, inexpensive
Applications
ABS injection molding is used to produce many types of plastic parts, including:
1. keyboard keys
2. protective headgear
3. electrical outlet wall plates, wall socket plastic guards
4. phone hardware and, phone adaptors
5. Automotive parts (e.g., wheel covers)
6. consumer goods Consumer goods (including cosmetic parts, handheld devices, housings, and moldings for electrical tools, remote controls, computers, and telephone components)
7. sports equipment
8. kitchen appliances.
9. industrial fittings

Grades and Brands
Well-known brands of ABS include Samsung Starex®, Toray Toyolac®, BASF Terluran®, and Ineos Lustran®.

Nylon Polyamide (PA)

Nylon, also known as polymer fabric is one of the most versatile injection moulding materials due to its different nature. It is used for various apparel along with car tires, fishnet, and electrical applications like insulators.
With Nylon, it has many advantages as an injection moulding material. One is that it has good abrasion resistance making it last longing and elastic in nature. On the other hand, the disadvantages are that the material tends to easily melt. Which makes it hard to make use of the material in liquid state. It also absorbs water from the moisture in the air or directly.

Properties

In contrast to various other plastics, nylon demonstrates limited resistance against strong acids and bases. Its strength doesn't match up to that of polypropylene, and it falls short in comparison to polycarbonate regarding impact resistance. Injection molding nylon presents challenges due to its susceptibility to shrinkage and potential issues with inadequate mold filling..
What is the Molding Temperature for Nylon?
The molding temperature for Nylon is under 220-320 Celsius,  with PA 6’s process temperature at  220-300 degrees and PA 66’s process temperature at 260-320 degrees Celsius. Because the processing temperature of Nylon is narrow, the temperature of the machine barrel must be controlled strictly to avoid decomposition of melt.

Benefits

Wide variety. High strength and temperature tolerance when reinforced. Chemically resistant except to strong bases or acids
Applications
Applications for nylon injection molding include:

1. strong mechanical parts such as bearings, bushings, gears, and slides
2. casings and snap-fit closures
3. threaded inserts and kinetic parts
4. jigs and fixtures
5. Thin-walled features, combs, spools, gears and bearings, screws, structural parts (with glass),
6. pump parts,
7. under-hood components, cameras.
8. high-ware parts, quick-release buckles, gears, and hand cranks.
With its low coefficient of friction, nylon is also well-suited for applications with high-friction and wear.

Grades and Brands

Nylon comes in four main grades, and each has slightly different mechanical properties:
Nylon 11 is used in outdoor applications and has greater resistance to dimensional changes.
Nylon 12 has the lowest melting point of all four grades and resists water absorption.
Nylon 46 has the highest operating temperature.
Nylon 66 has a high melting point and resists acids used in chemical processing.
Nylon can also be filled with glass fibers for greater mechanical strength.

High-Density Polyethylene (HDPE)

High-density polyethylene (HDPE) is a resilient, robust thermoplastic material commonly utilized in the production of plastic bottles, shampoo containers, toys, recycling bins, and flower pots. Its primary benefit lies in its cost-effectiveness while offering rigidity and superior strength.

Conversely, the drawbacks of HDPE include its high flammability, non-biodegradability, posing challenges in disposal. Furthermore, its inability to decompose and its susceptibility to poor weathering are additional concerns.
Low-Density Polyethylene (LDPE)

When compared to HDPE, low-density polyethylene (LDPE) exhibits a notably softer and more pliable nature. LDPE serves as a preferred material in injection molding for crafting items such as bottles, plastic bags, wraps, and playground slides. Its advantages lie in its resistance to moisture and chemicals. Additionally, it boasts affordability and is deemed food-grade, ensuring safety for food-related applications. However, the drawbacks of LDPE include its flammability and limited temperature tolerance.

Properties

PE plastics include polyethylene terephthalate (PET, PETE), a material that is not defined by its density. Like LDPE, PET can be as clear as glass; however, designers can also select grades of PET or PETE with different levels of optical clarity. HDPE, LDPE, and PET all resist moisture and chemicals, but LDPE is softer and more flexible than HDPE, which is an opaque material.
What is the Molding Temperature for High Density Polyethylene (HDPE)?
The melting point of HDPE is 115 degrees Celsius, while the process temperature is 84 degrees Celsius.

Benefits

Tough, impact- and chemical-resistant, high shrink, low dimensional stability, inexpensive, density less than water (floats)

Applications

Applications for polyethylene injection molding may be limited to indoor applications because of their poor UV resistance. Because they are unable to withstand high service temperatures, these plastic materials may not be suitable for some processing applications. Often, injection molded polyethylene is used in products such as
1. housewares
2. toys
3. food containers
4. automotive parts
5. Lawn furniture
6. totes,
7. containers,
8. gas cans

Grades and Brands

PE plastics come in numbered grades where higher numbers generally indicate higher densities. For example, HDPE 500 has a higher density than HDPE 300. Both grades have a higher density than LDPE, which also uses a numbering system for grades. BASF and DuPont are two of the leading suppliers of PE for engineering (as opposed to general-purpose) applications.

Polycarbonate (PC)

Polycarbonate is a strong hard injection molding materials used in engineering and tends to be transparent. The material PC is in compact discs, safety hamlets, bulletproof glass and other electrical and telecommunication hardware.
The advantages is that it is nearly unbearable as its bullet resistance and is high quality. It also protects against discolouring however, after a long time of UV light exposure it can turn yellow. Additionally, it can be sensitive to scratching.

Properties

Injection-molded polycarbonate is occasionally favored over acrylic due to its ability to retain its physical properties across a broader temperature spectrum. However, the process of molding polycarbonate demands elevated temperatures, potentially increasing its manufacturing costs. Nevertheless, owing to its consistent and predictable shrinkage rates, polycarbonate provides precise dimensional control, allowing for tighter tolerances in the final product.
Benefits
Strong, extremely impact resistant, low shrink, good dimensional stability and heat resistance, accepts high cosmetic finishes well

Applications

Applications for polycarbonate injection molding include:

9. machinery guards
10. clear and tinted windows
11. diffusers and light pipes for light-emitting diodes (LEDs) Lenses, indoor and outdoor lighting,
12. clear molds for urethane and silicone casting
13. Because it contains the chemical bisphenol A (BPA),
14. polycarbonate is not recommended for food preparation or storage.
15. cell phone housings,
16. electrical components,
17. medical devices,
18. bulletproof glass.

Grades and Brands

Polycarbonate plastic can be filled with glass and is available in grades that contain a relatively small percentage of stainless steel fiber. Popular brands include SABIC Lexan®, which is available in flame-resistant versions, and Covestro Makrolon®, which has glass-like transparency.

PC-ABS plastic

PC-ABS plastic stands as a leading engineering thermoplastic globally due to its remarkable mechanical properties. It boasts exceptional strength, stiffness, and heat resistance, coupled with impressive impact resistance, even under low-temperature conditions. Furthermore, PC-ABS exhibits enduring dimensional stability over time. Its superior flow characteristics and ease of processing contribute to its user-friendly nature, making it a highly workable material.

What is the Molding Temperature for PC-ABS Plastic Injection Molding?

The molding temperature range recommended for PC-ABS plastic is 50 to 80 degrees Celsius. The cooling time is essential for part performance and cycle time optimization. The melt temperature is between 250 to 270 Celsius.

Applications

Applications for polycarbonate injection molding include:

1. cell phone housings,
2. electrical components,
3. glove boxes,
4. knee bolsters,
5. overhead and middle consoles,
6. blow-molded seatbacks.
7. laptop monitor enclosures,
8. TV frames,
9. phone exteriors, and parts of portable hand-held devices.

Polyoxymethylene (POM)

POM, also known as acetal, is a type of plastic used in injection molding known for its hard and durable nature. Acetal finds application in various industries, including automotive manufacturing for producing parts. It is also utilized in the creation of zippers, fan wheels, door handles, lock systems, and even in medical devices like insulin pens. One of its key benefits is its high gloss surface and its resistance to organic solvents and most chemicals, although it is susceptible to damage from phenols.

However, drawbacks of acetal include its challenging bonding properties, poor resistance to acidic substances, and vulnerability to damage from ultraviolet (UV) light.

Properties

In its pure form, acetals have low impact strength and a very high rate of thermal expansion. Yet, POM can be reinforced with fiberglass or minerals for improved strength and stiffness. Compounds that are reinforced with both provide an excellent balance of mechanical properties. Because injected molded POM lacks resistance to sunlight, its outdoor applications are limited.
What is the Molding Temperature for Acetal Copolymer (POM)?
The process temperature of Acetal Copolymer is 110 degrees Celsius.

Benefits

Tough, stiff, hard, and strong. Good lubricity and resistance to hydrocarbons and organic solvents. Good elasticity, slippery. Low creep.  Great fatigue properties.
Applications
With its low coefficient of friction, injection-molded POM is used in bearings, gears, conveyor belts, and pulley wheels. Additional applications include
1. fasteners, Gears,
2. eyeglass frames,
3. parts for knives and firearms,
4. lock systems and high-performance engineering components.
5. pumps and pump impellers,
6. conveyor links,
7. soap dispensers,
8. fan and blower blades,
9. automotive switches, aerosol valves, lock systems, fuel tank modules,
10. electrical switch components,
11. buttons, and knobs.
12. rollers, bushings,
13. wear strips, ball bearings, small gear wheels, gas meters,
14. medical technology,
15. disposable applications.

Grades and Brands

There are two main types of acetal plastics: homopolymers, which provide higher hardness and tensile strength, and POM copolymers. Neither type of material can be fire-rated to a standard such as UL 94, and both experience relatively high shrinkage during injection molding. Popular brand names for POM plastics include DuPont Delrin® and Ensinger TECAFORM®.

Acrylic Poly (Methyl Methacrylate) (PMMA)

Acrylic, available in lightweight sheets, is a popular glass substitute with a wide array of applications. PMMA (polymethyl methacrylate) is utilized in various products such as windows, eyeglass lenses, and vehicle taillights. Its benefits include weather resistance, high gloss, and good resistance to abrasion.

However, acrylic has limitations in terms of heat resistance and may crack under substantial pressure loads, presenting as its primary disadvantages.

Properties

In contrast to certain plastics, acrylic exhibits resilience to water exposure and maintains precise tolerances well. PMMA is non-porous and doesn't absorb odors; however, it lacks resistance against solvents and is susceptible to staining from greases and oils. Despite its high tensile strength in injection molding, acrylic is prone to stress cracking when subjected to heavy loads.

Benefits

Good optical properties, high gloss, scratch resistant. Low shrink, Less sink in geometries with thin and thick sections

Applications

Applications for acrylic injection molding include
16. windows,
17. greenhouses,
18. solar panels,
19. bathroom enclosures,
20. other transparent components for architectural, lighting, and outdoor applications.
21. Light pipes, lenses, light shades,
22. optical fibers, signs.
Grades and Brands

General-purpose and specialty grades of PMMA plastics are available, including:

General-purpose acrylic is used in commodity products.
Sign-grade acrylic is stronger and provides excellent light transmission for outdoor signage.
Marine-grade acrylic resists continuous exposure to water.

Common brand names for acrylic plastics include Trinseo PLEXIGLAS®, which is available with high heat resistance, and DuPont LUCITE®, which has excellent optical clarity and transparency

Thermoplastic Polyurethane (TPU)

TPU (Thermoplastic Polyurethane) boasts a diverse range of properties including elasticity, transparency, and various resistances, owing to its combination of soft and hard segments. Primarily used in mobile phone cases, keyboard protectors, and footwear, this plastic stands out for its exceptional toughness, flexibility, and resistance to impacts like tears. Its resilience against grease and oil contributes to good dimensional stability by minimizing wear and tear over time.

Nonetheless, the downsides of TPU include its relatively higher cost compared to alternative materials and a shorter shelf life.

Properties

Compared to TPE, TPU has superior resistance to extreme temperatures and chemicals. TPUs may be too hard for some injection molded parts, and tend to cost more, in part because drying is required before processing.

Benefits

Flexibility and Elasticity, Abrasion Resistance, Chemical Resistance, Versatility, Weather Resistance, Adhesion Properties, Biocompatibility, Ease of Processing, Impact Resistance.

Applications

Applications for TPU injection molding include footwear, gaskets, caster wheels, and sporting goods along with cases or enclosures for electronics and medical devices. In medical applications, TPUs are sometimes used instead of polyvinyl chloride (PVC), a plastic that may cause skin irritation.

Grades and Brands
Thermoplastic polyurethanes come in commercial, medical, and industrial grades. There are three main classes of TPU materials: polyester, polyether, and polycaprolactone. Trademarked products are available from manufacturers such as Lanxess, Lubrizol, Texin, and Ultralast.

Thermoplastic Rubber (TPR) 

Thermoplastic rubber, also known as elastomer, represents another notable injection molding material characterized by a blend of plastic and rubber components. It finds extensive usage in automotive applications like wire and cable insulation, as well as in various home appliances. Its primary advantage lies in its ability to stretch and revert to its original shape, showcasing resilience and flexibility.

Furthermore, this material is considered environmentally friendly due to its composition of non-toxic and recyclable plastics, contributing to a reduced environmental impact. However, a notable drawback of thermoplastic rubber is its relatively higher cost. Additionally, while it can endure high temperatures, prolonged exposure may lead to a loss of its rubber-like properties.

Properties

When contrasted with liquid silicone rubber (LSR), TPE (Thermoplastic Elastomer) offers easier and more cost-effective molding processes. Nonetheless, TPE is prone to experiencing creep under prolonged pressure, causing potential permanent deformation in solid materials. Moreover, at elevated temperatures, TPE tends to lose its rubber-like properties and is notably pricier compared to various other plastic injection molding materials.

Benefits

Flexibility and elasticity, Durability and abrasion resistance, Weather resistance, Versatility in hardness, Ease of processing, Lightweight nature, Cost-effectiveness, Noise and vibration dampening

Applications

Applications for TPE injection molding include:

1.footwear
2.pet products
3.Automotive applications include weather seals and shock dust boots.
4.Medical applications include breathing tubes, valves, catheters, and ventilation masks.

Grades and Brands
ISO 18064 defines generic classes of commercial TPEs. There are many different manufacturers and brand names, including Teknor Apex Telcar®, Kraiburg HIPEX®, and Dynaflex™ from Avient (formerly PolyOne). Healthcare-grade TPEs are available.

Polypropylene (PP)

Finally, among the injection molding materials, Polypropylene, also known as polypropene, stands out as a thermoplastic polymer widely employed across diverse applications. Notably, it claimed the largest revenue share of 34.2% in 2020, showcasing its extensive usage. Its primary prevalence lies within the food storage and packaging industry due to its non-reactive nature with food substances. Additionally, this material boasts high impact strength and excellent resistance to moisture.

However, drawbacks of polypropylene include susceptibility to UV degradation, resulting in a substantial 70% strength loss when exposed to sunlight. Furthermore, its chemical composition renders it potentially flammable, posing fire hazard concerns.

Properties

Despite its comparative advantages, polypropylene degrades with UV light and is extremely flammable. At temperatures above 100° C (212° F), this injection-molded plastic dissolves into aromatic hydrocarbons, such as benzene and toluene, which are harmful to humans. Polypropylene plastic is also difficult to bond and paint.

Benefits

Inexpensive, higher impact resistance in some grades, PP homopolymer can be brittle in cold. Wear resistant, flexible with high elongation. Resistant to acids and bases. Density less than water (floats)

Applications

Applications for polypropylene injection molding include

1. Toys
2. storage containers
3. sporting goods
4. packaging appliances
5. power tool bodies
6. Integral hinges or living hinges, fans, snap-over lids (e.g., shampoo bottle tops),
7. medical pipette tubing

Grades and Brands

Pure polypropylene is a commodity plastic with the lowest density, but high crystalline polypropylene (HcPP) is filled with glass fibers for rigidity. Semitron® from Mitsubishi Chemical Advanced Materials is a leading brand.

Polystyrene (PS)

Polystyrene plastics are known for their lightweight nature, affordability, and resilience against moisture and bacterial proliferation. These commonly used plastics also exhibit commendable resistance to diluted acids and bases, offering durability in various chemical environments. Notably, they showcase exceptional tolerance to gamma radiation, a crucial sterilization method employed in medical device manufacturing.

Properties

There are two main types of polystyrene: general-purpose polystyrene (GPPS) and high-impact polystyrene (HIPS). GPPS is brittle and has less dimensional stability than HIPS, which is compounded with butadiene rubber to enhance its material properties. GPPS also has a glass-like clarity whereas HIPS is opaque.

Benefits

high optic clarity, good electric insulator
Applications
Applications for polystyrene injection molding include
1.medical,
2.optical, electrical,
3.electronic applications.
4.plastic toys, cases, containers, and trays.

Both materials are flammable and susceptible to UV degradation.

Grades and Brands
Polystyrene can be filled with glass for added strength or co-polymerized with acrylic for greater clarity and improved chemical and UV stability. Brand names include American Styrenics PolyRenew® and BASF Polystyrol®.

Properties of Injection Moulding Materials 

 

Moulding Materials	Max Temp	Chemical resistance	Tensile strength	Flexural strength	Impact strength
Acrylonitrile Butadiene Styrene (ABS)	60 – 93℃	Poor to fair	6,600 psi	270,000 – 380,000 psi	3.0 – 7.5 ft-lb/in
Nylon	93 – 177℃	Good to excellent	6,000 – 24,000 psi	390,000 – 1,100,000 psi	2 – 8 ft-lb/in
High density Polyethylene (HDPE)	120℃	Good to excellent	3,200 – 4,500 psi	145,000 – 225,000 psi	0.4 – 4 ft-lb/in
Low density Polyethylene (LDPE)	65 – 90℃	Good to excellent	1,200 – 4,000 psi	35,000 – 48,000 psi	Not breakable ft-lb/ in
Polycarbonate (PC)	288 – 316℃	Poor to fail	8,500 psi	13,500 psi	2 – 18 ft-lb/in
Polyoxymethylene (POM)	180 – 230℃	Excellent	6,000 – 22,000 psi	120,000 – 170,000 psi	0.8 – 2 ft-lb/in
Acrylic (PMMA)	130℃	Excellent	2,800 – 10,900 psi	13,000 psi	0.22 – 1.1 ft-lb/in
Thermoplastic Polyurethane (TPU)	71-121℃	Fair to good	6,960 – 12,000 psi		0.8 – 10.1 ft-lb/in
Thermoplastic Rubber (TPR)	170℃	Fair to good	1,000 – 7,000 psi	5,000 – 800,000 psi	2.5 – no break ft-lb/in
Polypropylene (PP)	65 – 148℃	Excellent	4,500 – 18,500 psi	210,000 – 1,500,000 psi	1.4 – 5.5 ft-lb/in

More Plastic Injection Molding Materials

The plastics detailed in this article encompass a wide array of common injection molding materials, spanning specialty plastics and polymer blends, all of which Lingshantech specializes in for your injection molding needs.

Given the multitude of options available, seeking guidance from experts is beneficial when selecting a suitable plastic resin for your project. At Lingshantech, our team of design and production specialists is readily available to assist you in making informed decisions. As part of our comprehensive injection molding service, you'll receive design for manufacturing (DFM) feedback alongside your quotation.