POM-DuPont Delrin 500P
To achieve maximum mechanical fatigue resistance and metal-like rigidity in precision gear and sliding components, Delrin 500P by Delrin USA (formerly DuPont) stands as the global homopolymer POM benchmark. Featuring a density of 1.42 g/cm³ and an intermediate melt flow rate of 15 g/10 min, this highly crystalline acetal polymer provides significantly higher tensile strength and stiffness than typical acetal copolymers. Jucheng Precision, operating under ISO 9001 and IATF 16949 certified frameworks, specializes in high-precision molding of Delrin 500P. Backed by 35+ advanced injection presses and five-axis tooling, we master its high shrinkage (1.8%-2.2%) to deliver pristine, zero-flash gears verified by Zeiss CMM.
Delrin 500P Homopolymer Mechanical & Creep Resilience
Delrin® 500P NC010 is a medium-viscosity acetal homopolymer. Due to its superior high-crystallinity matrix, it provides enhanced mechanical strength, fatigue resistance, and creep modulus over standard copolymer acetals:
| Mechanical Property | Delrin 500P Typical Value | Homopolymer (POM-H) Engineering Edge |
|---|---|---|
| Tensile Stiffness | Tensile Modulus 3100 MPa / Yield 71 MPa | Exhibits roughly 15% to 20% higher tensile yield strength and flex modulus than acetal copolymers, allowing for thinner, lighter, and more rigid wall designs. |
| Long-Term Creep | Tensile Creep Modulus (1000h) 1600 MPa | Demonstrates exceptional resistibility to structural deformation and thread loosening under continuous mechanical loads. |
| Dynamic Fatigue | Unmatched Fatigue Cycle Resistance | Highly resistant to cyclic loading, preventing structural fatigue cracks in continuous-running gearboxes and belt tensioners. |
Frictional and Structural Molding Adaptability for Delrin 500P
With intermediate melt viscosity and inherent slip additives, Delrin 500P flows uniformly to secure high-tolerance functional parts:
| Molding Technology | Process Compatibility & Operational Details |
|---|---|
| Precision Dynamic Gears | Excellent. The primary process for Delrin 500P. Ideal for precision spur gears, planetary gears, worm drives, and dynamic cam structures requiring high fatigue life. |
| Low-Friction Slide Bearings | Excellent. Highly suitable for sliding bushings, structural pulleys, dynamic conveyer rollers, and linear slide guides running without lubrication. |
| Fast-Cycling Snap-Fit Clips | Excellent. High elastic recovery and yield strain allow molding of heavy-duty safety seatbelt restraint clips, industrial fasteners, and automotive cabin clips. |
POM-DuPont Delrin 500P Mold Engineering Matrix
Molding an acetal homopolymer like Delrin 500P requires strict thermal stability parameters and advanced mold outgassing solutions to protect tooling and avoid visual splay:
S136 Hardened Steel & Formaldehyde Venting
Acetal homopolymers release corrosive formaldehyde gas when overheated (>230°C) or held too long in the melt barrel. To protect tool face integrity, Jucheng’s tooling division uses hardened, corrosion-resistant S136 stainless steel molds and machines deep venting slots (0.020mm) on parting lines to prevent diesel burn marks.
Managing High Crystalline Shrinkage
Delrin 500P exhibits high volumetric shrinkage (1.80% to 2.20%) due to its high crystalline nucleation rate. Our engineers conduct Moldflow analysis during DFM to balance gate designs and pack cycles, preventing voids and sink marks on thick structural ribs.
Oil-Heated Mold Temperature Controls
To optimize crystallinity and surface gloss, we keep mold temperatures at 80°C to 120°C (176°F to 248°F) using pressurized temperature controllers. Low mold temperatures prevent the crystalline phase from forming correctly, resulting in part warpage and dimensional instability over time.
Key Application Fields for POM-DuPont Delrin 500P
- Automotive Mechanisms (IATF 16949 Certified): Door latch gears, window regulator sliders, seatbelt restraint mechanisms, windshield wiper pivots, and fuel level sender modules.
- Precision Consumer & Industrial Machinery: Office printer gear trains, heavy-duty logistics conveyor rollers, sliding zipper pullers, water mixer valves, and heavy-duty snap fasteners.
- Medical Drug Delivery Systems (ISO 13485 Compliant): Dry-powder inhaler internal gears, insulin pen sliding racks, surgical instrument sliding blocks, and dosing mechanisms (non-implantable).
Properties
| Density | 1.42 g/cm³ |
| Melt Mass-Flow Rate (MFR) (190°C/2.16kg) | 15 g/10 min |
| Tensile Modulus | 3,100 MPa |
| Tensile Stress at Yield | 71 MPa |
| Tensile Strain at Yield | 17 % |
| Nominal Strain at Break | 30 % |
| Flexural Modulus | 2,900 MPa |
| Flexural Stress (@ 3.5% strain) | 80 MPa |
| Notched Charpy Impact Strength (23°C) | 9 kJ/m² |
| Melting Temperature | 178 °C |
| Vicat Softening Point (B/50) | 150 °C |
| Heat Deflection Temperature (HDT @ 1.80 MPa) | 112 °C |
| Linear Mold Shrinkage | 1.80 - 2.20 % |
| Maximum Part Size | 1000 x 800 mm |
| Minimum Part Size (Micro Gear limit) | 0.5 x 0.5 mm |