PDI Molding is a premier provider of plastic injection molding services. Our advanced high-tonnage injection molding equipment works well with nearly all common polymers and plastics used in injection molding. Our comprehensive job shop gives us additional value-added capabilities that enable us to handle orders in any volume.

For injection-molded parts that require exceptional rigidity and strength, we offer glass-filled nylon as a material option. While this material can sometimes be challenging to work with, PDI Molding has developed and sustained excellent technical competency with glass-filled nylon for injection molding.


Properties of Glass Filled Nylon

Pure nylon fails to withstand heat and UV light, so it is often modified in various ways to improve specific properties. Adding glass fibers to the nylon produces beneficial properties such as:

  • Increased rigidity
  • Improved hardness
  • Superior tensile strength
  • Increased creep strength
  • Greater dimensional stability
  • High mechanical damping



When Should You Use Glass Filled Nylon in Injection Molding?

Glass-filled nylon is used when the final product must withstand heat, chemicals, stress, or other harsh operating conditions. Some of the advantages of glass-filled nylon include:

  • Stiffness. Glass-filled nylon features stiffness up to 80% more than regular nylon materials.
  • Thermal tolerance. The thermal expansion rate of glass-filled nylon is only about half of standard nylon materials, which means it won’t deform easily due to abrupt changes in operating temperature.
  • Durability. Glass-filled nylon features up to 70% more tensile strength than unfilled nylon, which means components made from this material can handle significant stress without bending or breaking.

While glass-filled nylon has a number of advantages, it also has some properties which will need consideration in the design process:

  • Rigidity. Glass-filled nylon requires a higher level of part analysis to accurately determine molded in stress.
  • Abrasive. The abrasive nature of glass-filled nylon causes wear on tooling and mated parts.
  • Weight. Glass-filled nylon may be up to 15% heavier than comparable unfilled nylon.

Experience Molding Glass Filled Nylon Components

Plastics Design International has the skills and equipment required to undertake complex glass-filled nylon injection molding projects. Our capabilities, skilled team, and advanced equipment allow us to adhere to extremely tight weight and dimensional tolerances. We can handle injection molding projects of nearly any complexity, including designs that call for nylon and glass-filled nylon materials.

Glass-filled nylon injection molding is often an ideal choice when the required component must be strong, stable, and resistant to chemicals and oils. For more information about glass-filled nylon for injection molding for your project, please don’t hesitate to request a quote.

Injection Molding Glass Filled Nylon Capabilities:

General Capabilities
  • Injection Molding
  • Custom Fabrication
  • Prototyping
  • Testing
  • Inspection
  • Mold Making
  • 24/7 Lights Out
  • Operation
  • Global Clientele
  • Material Requirement
  • Planning
  • Inventory Control
  • 3 Shifts
  • Insert Molding
  • Assembly
  • Engineering Changes
  • In-House Mold
  • Maintenance
Work Space Capacity

55,000 square feet

Product Capabilities
  • Small to Medium Parts
  • Low Volume
  • High Volume/Low Mix Capabilities
  • Insert Molding
Mold Process Type

Custom Injection Molding for Glass Filled Nylon


Engineering and Commodity Thermoplastics grades including but not limited to;

  • ABS
  • Acetal
  • Acrylic
  • Copolymer
  • Polypropylene
  • Nylon
  • Polyaryletheretherketone (PEEK)
  • Polycarbonate
  • Polyester
  • Polypropylene
  • Polystyrene
  • Polyurethane
  • Thermoplastic
  • PEI
  • All thermoplastic materials except PVC, Silicone, & PTFE
Temperature Range

Melt temperatures up to 800°F

Machine Maximum Velocity

Up to 12 in/sec

Clamp Tonnage

Min: 35 tons

Max: 385 tons

Shot Size The maximum weight of plastic that can be displaced or injected by a single injection stroke. Generally expressed as grams of polystyrene.

Up to 676 grams of PS

Learn more about Shot Size in our glossary

Number of Cavities The number of cavities in the mold used to produce multiple products in one molding cycle.

1 to 32 cavities

Learn more about Cavities in our glossary

Part Thickness

.020 and up

Tolerance (+/-)


Secondary Services
  • Part Assembly
  • Hot Stamping
  • Machining
  • Heat Staking
  • Sonic Welding
  • Flushing/Cleaning
  • Hardness Testing
  • Leak Testing
  • Moisture Testing
  • Force/Break Testing
  • Destruct Testing
  • Continuity Testing
  • Part Decorating
Surface Finish

Mold customer texturing and engraving

Additional Services
  • APQP – Advance Product Quality Plan
  • Process Validation
  • Insert Molding
  • Dew Point Controlled Facility
  • CNC Machining
  • Electric Discharge Machining (EDM)
  • Mold Acquiring Capabilities
  • Mold Evaluation
  • Mold Maintenance
  • Mold Making
  • Domestic Tooling
  • Overseas Tooling
  • Tool Design
  • Product Development Assistance
  • Mold Flow
  • Tooling
  • Inspection
  • CMM Inspection
  • Optical Measuring Machine
  • MRP
Production Volume
  • Prototype
  • Low Volume
  • Small Run
  • High Volume
  • Large Run
  • Long Run
Lead Time

Quoted on job by job basis
Rush Services Available

Just- In Time/ Ship To stock

Industry Focus
  • Aerospace
  • Automotive
  • Construction
  • Communication
  • Consumer Goods
  • Defense
  • Electrical
  • Electronic
  • Fire Safety
  • Firearms
  • Maritime
  • Medical
  • Military
  • Printing
  • Optical
  • Telecommunications
Industry Standards
  • ISO 9001:2015
  • TS (quality standard developed by the automotive industry)
  • RoHS Compliant
  • WEEE Compliance
  • Material Composition Declaration IPC 1752
  • ITAR
  • SVHC
  • Proposition 65
  • Lights Out Manufacturing
  • 3 Shifts
  • 24/7
File Formats

Preferred format is SolidWorks, but we can also accept;

  • AutoCAD (DWG,DWZ)
  • DXF – Drawing Interchange Format, or Drawing Exchange Format
  • IGES – Initial Graphics Exchange Specification, ANSI file format.
  • Inventor (IDW, IPT)
  • IronCAD (ICD,ICS)
  • JPG or JEPG – Joint Photographic Experts Group
  • PDF – Portable Document Format
  • Pro-E or Pro/Engineer (DRW,PRT,XPR)
  • SolidEdge (DFT)
  • STEP – Standard for the Exchange of Product Model Data