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SyBridge Technologies

SyBridge Technologies

Bridging the gap between innovation and mass production

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Injection Molding

Injection Molding
February 14, 2022

The 4 Biggest Design Mistakes for Injection Molding

Read moreThe 4 Biggest Design Mistakes for Injection Molding
Tagged With: Design, Injection Molding
January 10, 2022

Urethane Casting vs. Injection Molding — A DFM Guide

Read moreUrethane Casting vs. Injection Molding — A DFM Guide
Tagged With: Injection Molding, Urethane Casting
Injection molding
December 13, 2021

Tips for Injection Molding With High-Temperature Plastics

Read moreTips for Injection Molding With High-Temperature Plastics
Tagged With: Injection Molding, Materials
Injection molding
November 24, 2021

What You Need To Know About Material Compatibility For Multi-Material Injection Molding

Read moreWhat You Need To Know About Material Compatibility For Multi-Material Injection Molding
Tagged With: Injection Molding
Injection molding
November 3, 2021

When to Use 3D Printing for Injection Mold Tooling

Read moreWhen to Use 3D Printing for Injection Mold Tooling
Tagged With: 3D Printing, Injection Molding
UHMW
August 18, 2021

Know Your Materials: UHMW

Read moreKnow Your Materials: UHMW
Tagged With: CNC Machining, Injection Molding, Materials
Injection Molding Parts
August 11, 2021

3 Tips for Creating Stronger Injection Molding Parts

Read more3 Tips for Creating Stronger Injection Molding Parts
Tagged With: Injection Molding
Polystyrene
August 5, 2021

Know Your Materials: Polystyrene (PS)

Read moreKnow Your Materials: Polystyrene (PS)
Tagged With: Injection Molding, Materials
Post-Processing
July 27, 2021

An Overview of Post-Processing Options for Injection Molding Parts

Read moreAn Overview of Post-Processing Options for Injection Molding Parts
Tagged With: Injection Molding, Post-Processing
Polyoxymethylene (POM), more commonly known as acetal or its branded name Delrin®, is an engineering plastic offering low friction, high stiffness, and excellent dimensional stability. Polyoxymethylene is a category of thermoplastics and includes many different formulations of the material, all of which vary slightly. As such, it’s important to learn as much as you can about each type before choosing one for your next project. Delrin® is a semi-crystalline engineering-grade thermoplastic widely used to create highly precise parts. In general, Delrin® provides impressive dimensional stability and sliding properties. It’s known for its high strength, wide operating temperature range (-40°C to 120°C), and excellent mechanical properties. Here’s everything you need to know about this material, from how it’s made to its best-fit applications. Inside the polyoxymethylene production process Acetal was first discovered by German chemist Hermann Staudinger in 1920 before it was commercially synthesized by research chemists at DuPont, the original manufacturers of Delrin® plastic, in 1956. Like all other plastics, acetal is created by distilling hydrocarbon fuels down into lighter groups called “fractions,” which can then be combined with other catalysts via polymerization or polycondensation to produce a finished plastic. To make an acetal homopolymer like Delrin®, anhydrous formaldehyde must be generated by causing a reaction between aqueous formaldehyde and alcohol to form a hemiformal. The hemiformal is then heated to release the formaldehyde, and the formaldehyde is polymerized by anionic catalysis. The resulting polymer is stabilized when it reacts with acetic anhydride, which creates polyoxymethylene homopolymer. Acetal comes in many different commercial varieties and formulations, each with its own advantages and disadvantages. For example, Delrin® 500 is medium-viscosity, all-purpose polyoxymethylene that has a good balance of flow and physical properties. It can be used to produce parts via CNC machining and injection molding and is frequently used to manufacture mechanical parts, fuel systems, and fasteners. Delrin® 1700P, on the other hand, is a very low- viscosity, fast-molding resin that is best suited for parts with complex shapes, thin walls, long flow paths, or multi-cavity tools. It also offers the best molding thermal stability for deposit-free molding in demanding conditions. Since there are dozens of different formulations of acetal, it’s important to do your research and make sure your prospective plastic offers all of the properties you need for your application. Delrin® plastic properties and mechanical specifications small black Delrin pieces Delrin® can also be found in all-purpose industrial equipment like bearings, gears, pumps, and meters. Acetal’s excellent mechanical properties make it extremely versatile, offering a unique blend of properties that you won’t find in most metals or other plastics. Delrin® plastic is strong, rigid, and resistant to impact, creep, abrasion, friction, and fatigue. It’s also well known for its excellent dimensional stability during high-precision machining. Acetal can also stand up to moisture, gasoline, solvents, and a wide range of other neutral chemicals at room temperature. From a design standpoint, parts made with extruded POM naturally have a glossy surface finish. Since acetal is compatible with CNC machining, injection molding, extrusion, compression molding, rotational casting, and more, product teams are free to choose the manufacturing process that works best for their budget and their needs. However, it’s worth noting that Delrin® plastic is typically very challenging to bond. Acetal material properties vary by formulation, but the mechanical properties for Delrin® 100 NC010, one of the most popular formulations, include: Tensile modulus: 2900 MPa Yield stress: 71 MPa Yield strain: 26% Density: 1420 kg/m3 Charpy notched impact strength, +23°C: 15 kJ/m2 Coefficient of linear thermal expansion, normal: 110 E-6/K Water absorption: 0.9% Delrin® does have a few limitations. For instance, even though Delrin® is resistant to many chemicals and solvents, it’s not very resistant to strong acids, oxidizing agents, or UV radiation. Prolonged exposure to radiation can warp the color and cause the part to lose its strength. Also, this material isn’t readily available in a flame-retardant grade, which limits its utility for certain high-temperature applications. Why choose Delrin® plastic? These limitations notwithstanding, there are many reasons to choose acetal over other materials. When compared to other plastics, acetal offers better creep, impact, and chemical resistance, better dimensional stability, and higher strength. It also has a lower coefficient of friction. Acetal outpaces certain metals as well. Parts built with this material have a higher strength-to-weight ratio, better corrosion resistance, and offer more opportunities for part consolidation. You can build thinner and lighter parts faster and at a lower price point with acetal than with a comparable metal. Delrin® plastic can be found in almost every major manufacturing sector. In the automotive industry, common applications include heavy load-bearing gears, fuel system components, loudspeaker grilles, and safety system components like seatbelt hardware. Delrin® can also be found in all-purpose industrial equipment like bearings, gears, pumps, and meters. In the consumer goods and appliances space, this material can be used to make anything from zippers and pens to knife handles and lawn sprinklers. Getting started with Delrin® There’s a lot for product teams to love about Delrin®. It’s strong, stable, versatile, and its excellent mechanical properties make it a good choice for a wide variety of applications in a number of industries. However, with dozens of different formulations of acetal on the market, it can be very challenging to determine which one might be the best fit for your unique project. A seasoned manufacturing partner can help demystify the material selection process. When you partner with Fast Radius, you partner with a team of on-demand manufacturing experts who have years of experience helping product teams navigate material selection. We’re well-versed in the wide range of materials that can be used for both traditional and additive manufacturing — including Delrin®. Once you’ve selected the Delrin® formulation that’s the right fit for your application, our team of experts can help facilitate the entire manufacturing process — from design and prototyping to production and fulfillment. With a full suite of manufacturing services including CNC machining and injection molding, Fast Radius can bring your vision to life quickly and easily. Contact us today to get started.
July 22, 2021

Know Your Materials: Delrin (Polyoxymethylene)

Read moreKnow Your Materials: Delrin (Polyoxymethylene)
Tagged With: CNC Machining, Injection Molding, Materials
Injection Molding
July 13, 2021

A Brief History of Plastic Injection Molding

Read moreA Brief History of Plastic Injection Molding
Tagged With: Injection Molding
Injection Molding Automation
July 7, 2021

How Automation in Injection Molding Improves Efficiency

Read moreHow Automation in Injection Molding Improves Efficiency
Tagged With: Injection Molding
June 30, 2021

Top 5 Impact-Resistant Plastics

Read moreTop 5 Impact-Resistant Plastics
Tagged With: Injection Molding, Materials
PVC
June 30, 2021

Know Your Materials: Polyvinyl Chloride (PVC)

Read moreKnow Your Materials: Polyvinyl Chloride (PVC)
Tagged With: Injection Molding, Materials
PEEK
June 21, 2021

Know Your Materials: Polyetheretherketone (PEEK)

Read moreKnow Your Materials: Polyetheretherketone (PEEK)
Tagged With: 3D Printing, CNC Machining, Injection Molding, Materials
Acetal-and-Nylon
June 15, 2021

Know Your Materials: Acetal vs. Nylon

Read moreKnow Your Materials: Acetal vs. Nylon
Tagged With: 3D Printing, CNC Machining, Injection Molding, Materials
PET
June 7, 2021

Know Your Materials: Polyethylene Terephthalate (PET)

Read moreKnow Your Materials: Polyethylene Terephthalate (PET)
Tagged With: 3D Printing, Injection Molding, Materials
HDPE-and-LDPE
May 27, 2021

Know Your Materials: Low-Density Polyethylene vs High-Density Polyethylene

Read moreKnow Your Materials: Low-Density Polyethylene vs High-Density Polyethylene
Tagged With: CNC Machining, Injection Molding, Materials
Injection Molding
May 17, 2021

Tips for Cosmetic Injection Molding Defects

Read moreTips for Cosmetic Injection Molding Defects
Tagged With: Injection Molding
PC-ABS
April 22, 2021

Know Your Materials: PC-ABS

Read moreKnow Your Materials: PC-ABS
Tagged With: 3D Printing, Injection Molding, Materials
April 21, 2021

Top 5 Chemical-Resistant Plastics

Read moreTop 5 Chemical-Resistant Plastics
Tagged With: Injection Molding, Materials
April 19, 2021

Polypropylene vs. Nylon (Polyamide): Benefits and Drawbacks for Various Applications

Read morePolypropylene vs. Nylon (Polyamide): Benefits and Drawbacks for Various Applications
Tagged With: 3D Printing, Injection Molding, Materials
ABS
April 15, 2021

Know Your Materials: Acrylonitrile Butadiene Styrene (ABS)

Read moreKnow Your Materials: Acrylonitrile Butadiene Styrene (ABS)
Tagged With: 3D Printing, CNC Machining, Injection Molding, Materials
April 7, 2021

Know Your Materials: Polyethylene (PE)

Read moreKnow Your Materials: Polyethylene (PE)
Tagged With: CNC Machining, Injection Molding, Materials
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