TPU-Lubrizol Estane GP72DB
To bridge the performance gap between soft elastomers and rigid engineering plastics under high load-bearing fatigue and intense sliding wear, Lubrizol’s ESTANE® GP72DB provides a revolutionary aromatic polyester-based thermoplastic polyurethane (TPU). Boasting an exceptionally high engineering hardness of 68 Shore D and a density of 1.24 g/cm³, this structural grade delivers an ultimate tensile strength of 42.0 MPa and extreme tear strength up to 240 kN/m. Jucheng Precision, under IATF 16949 and ISO 9001 quality systems, specializes in high-precision molding of Estane GP72DB. Backed by five-axis CNC-machined H13 tooling, we control its complex 1.0%-2.0% shrinkage to prevent warpage, delivering flash-free heavy-duty gears verified by Zeiss CMM.
Estane GP72DB Engineering Hardness & Mechanical Profile
ESTANE® GP72DB is an aromatic polyester-based engineering thermoplastic polyurethane (TPU) engineered by Lubrizol, designed to deliver extreme mechanical strength, structural hardness, and exceptional tear resistance under ASTM standards:
| Mechanical Attribute | Estane GP72DB Nominal Metric | Dynamic Molding & Structural Advantage |
|---|---|---|
| Engineering Hardness | Shore Hardness 68 Shore D | Bridges the performance gap, offering high mechanical rigidity and plastic-like stiffness, ideal for load-bearing gears and structural slides. |
| Tear Strength | Graves Tear 240 kN/m / Trouser 220 kN/m | Provides ultimate tear-propagation resistance under intense dynamic shear stress, preventing mechanical structural failure. |
| Tensile Ultimate Strength | Tensile Strength at Break 42.0 MPa | Exhibits exceptional mechanical tensile load capability, maintaining high structural stability under high-torque dynamic tension. |
Heavy-Duty Process & Dynamic Load Configurations for Estane GP72DB
With its high structural hardness and excellent polymer melt flow, Estane GP72DB is highly suitable for dynamic mechanical components:
| Molding Technology Class | Process Compatibility & Operational Details |
|---|---|
| Precision Dynamic Silent Gears | Excellent. The primary process for Estane GP72DB. Ideal for dynamic silent spur gears, helical gears, structural sliding guides, and planetary gears. |
| High-Tension Industrial Couplings | Excellent. High tensile modulus and exceptional tear strength prevent structural rubber-joints from fracturing under continuous mechanical torque load. |
| Wear-Resistant Sliders & Bushings | Excellent. Low friction coefficients and outstanding DIN wear resistance are perfect for dynamic sliding guides, bearings, and dynamic wear washers. |
Engineering Hardness Processing & Flash Prevention Matrix
Molding an amorphous high-hardness polymer like Estane GP72DB requires strict thermal boundaries and low-stress mold setups to prevent flashing:
Micron-Level Flash Control (Tooling Precision)
Because Estane GP72DB has high flow capabilities under dynamic shear (MFR 20-35), molten resin can seep easily into minor mold gaps, causing parting line flash. Jucheng’s tooling division uses 5-axis CNC machines to achieve micro-tolerances, keeping mold parting clearances strictly within 0.005mm on premium S136 stainless steel mold cavity blocks.
Mold Temperature Matrix (Cooling Control)
We maintain mold temperatures at 20°C–40°C (68°F to 104°F) using pressurized water chillers. Keeping tools cold is critical to freeze the soft elastomeric phase quickly, allowing for automatic, warp-free ejection. Melt temperatures are controlled at 195°C–215°C.
Desiccant Drying Protocol (Hydrolysis Prevention)
TPU is highly hygroscopic. Moisture causes hydrolytic polymer chain cleavage, making surgical parts brittle. We dry raw material in desiccant hopper dryers at 105°C (221°F) for 2–3 hours, keeping moisture below 0.05% before molding, protecting dynamic mechanical tensile bonds.
High Elastic Shrinkage Compensation
Like standard TPU, Estane GP72DB exhibits high shrinkage (typically 1.0% to 2.0% depending on hardness and grade). Our tooling division scales mold cavities precisely to compensate for this shrinkage, ensuring exact dimensional results verified by Zeiss CMM.
Key Application Fields for TPU-Lubrizol Estane GP72DB
- Industrial Dynamic Machinery: High-precision silent gears, heavy-duty industrial dynamic couplings, slide bearings, dynamic conveyor guide blocks, and wear-resistant washers.
- Automotive Powertrains & Chassis (IATF 16949): High-temperature dust bellows, steering rack protective sleeves, vibration-damping grommets, and chassis seals.
- Heavy Appliance Structures: Washing machine vibration dampers, water pump impellers, heavy-duty logistics bins, and high-stiffness powertool casings.
Properties
| Density | 1.24 g/cm³ |
| Hardness (Shore D, 15s) | 68 - |
| Tensile Strength at Yield | 42 MPa |
| Tensile Elongation at Break (DAM) | 510 % |
| Tensile Modulus (100% Modulus) | 26 MPa |
| Tensile Modulus (300% Modulus) | 33 MPa |
| Flexural Modulus | 283 MPa |
| Tear Strength (Graves, Die C) | 240 kN/m |
| Tear Strength (Trouser, Die T) | 220 kN/m |
| Compression Set (23°C, 72h) | 22 % |
| Compression Set (70°C, 24h) | 34 % |
| Vicat Softening Point | 147 °C |
| Melt Flow (217°C/8.7kg) | 20 - 35 g/10 min |
| Linear Mold Shrinkage | 1.0 - 2.0 % |
| Maximum Part Size | 800 x 600 mm |
| Minimum Part Size | 1 x 1 mm |