What is Injection Molding Glass-Filled Nylon?

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Nylon (PA) or Nylon Polyamide is a common synthetic thermoplastic polymer that is popular due to its high melting temperature, tensile strength, low friction and resistance to chemicals. It is both durable and flexible. Nylon can be combined with other thermoplastics to achieve increased strength. It can also be combined with many additives, such as glass to create different variants and material properties.  

Glass-filled nylon is made by adding glass in powder form to nylon or by extruding the Nylon resin with glass fibers. The result is a nylon product that has increased stiffness and strength, amongst other enhanced properties. There are additional benefits that make glass-filled nylon an ideal material for specific projects. 

Advantages of Injection Molding Glass-Filled Nylon 

Glass-filled nylon’s applications combined with injection molding leads to many advantages for manufacturers. Some of these primary benefits of using glass-filled nylon for an injection molded product include: 

  • Increased stiffness (compared to standard nylon) 
  • Improved rigidity 
  • Increased tensile strength (compared to standard nylon) 
  • Increased creep strength 
  • Increased stability during temperature fluctuations 
  • Better dimensional stability 
  • Increased hardness (compared to standard nylon) 

As with any material, there are a few limitations to glass-filled nylon. These include brittleness, increased costs, abrasiveness, increased weight and weaker weld lines. Keep these advantages and disadvantages in mind when designing your glass-filled nylon part. 

Injection Molding Nylon (Glass-Filled) Specifications

Nylon (PA) is made of a combination of different monomer types. It is produced through the distillation of crude oil or from biomass. Nylon is classified as a thermoplastic because of the way it responds to heat. Like other thermoplastics, nylon can be heated, cooled and heated again without degradation. The glass powder is added to nylon to make glass-filled nylon. Glass-filled nylon has increased hardness, dimensional stability and weatherability. Glass-filled nylon’s properties:

  • Melting Point (°F)420 F
  • Tensile Strength: ~5,800 psi 
  • Hardness LevelR92 
  • Color: Translucent 
  • Good UV resistance 

Injection Molding Glass-filled Nylon Process

Nylon is first combined with glass fibers to increase its strength. During the injection molding process, nylon is heated into a liquid form. By applying pressure, nylon is injected into the cavity of a double-sided mold to create the desired shape. Once the custom part has cooled, it is released into a bin and then moved into postprocessing for finishing touches. The advantage of using injection molding for your Nylon parts is that once the custom mold has been made, it can be used over and over again, resulting in a large volume of high-quality Nylon products. 

Applications of Injection Molding Glass-Filled Nylon 

Glass-filled nylon is used for final products that must weather through heat, chemicals and other harsh conditions.  Some common uses of glass-filled nylon in injection molding include: 

  • Consumer goods 
  • Aerospace parts 
  • Automotive parts 
  • Communication parts 
  • Construction 
  • Defense 
  • Electrical parts 
  • Electronics 
  • Firearms 
  • Optical 
  • Telecommunications 

Get a Quote on Injection Molding Glass-Filled Nylon Today 

ICOMold can work with you on the design and production of your nylon (glassfilled) part. Get an instant quote today.  

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