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Excellent abrasion resistance for demanding mechanical service life requirements.
Outstanding low-temperature flexibility down to –40 °C.
Good hydrolysis resistance, suitable for humid and warm environments.
High melt flow index enabling efficient processing via extrusion and injection molding.
Consistent batch-to-batch quality with tight molecular weight distribution.
Automotive interior trim components including instrument panel skins and door panels.
Industrial hoses and pneumatic tubing requiring flex fatigue endurance.
Medical device tubing and non-implantable fluid handling components.
Consumer electronics protective casings and soft-touch overmolding layers.
Footwear midsoles and performance outsole compounds.
| Chemical Type | Thermoplastic Polyurethane (TPU), polyester-based |
| Product Form | Pellets |
| Appearance | Off-white to light beige granules |
| Primary Applications | Extrusion, injection molding, blow molding |
| Key Features | Abrasion resistance, low-temperature flexibility, hydrolysis stability |
| Benefits | Enhanced part durability, reliable processability, consistent surface finish |
| Density (ISO 1183) | 1.18–1.20 g/cm³ |
| Melt Flow Index (ISO 1133, 210 °C/5 kg) | 15–22 g/10 min |
Q1: What is the primary functional role of BASF DP 385SX in thermoplastic polyurethane (TPU) formulations?
A: DP 385SX is a high-performance processing aid and melt-flow modifier specifically designed for TPU systems. It enhances melt homogeneity, reduces extrusion torque, and improves surface finish—particularly beneficial in demanding processes such as thin-wall injection molding and fine-detail extrusion.
Q2: Is DP 385SX compatible with both aromatic and aliphatic TPU grades?
A: Yes, DP 385SX demonstrates broad compatibility across common aromatic and aliphatic TPU chemistries, including polyester- and polyether-based types. Its non-reactive nature ensures stable dispersion without triggering premature crosslinking or degradation during typical processing windows.
Q3: How should DP 385SX be incorporated into TPU compound formulations?
A: It is typically introduced via masterbatch dilution or direct dry-blend addition prior to extrusion or injection molding. For optimal dispersion, pre-mixing with a portion of the base TPU resin is recommended, followed by gentle mechanical blending to avoid dust generation and ensure uniform distribution.
Q4: Does DP 385SX affect the final mechanical properties of TPU parts?
A: At typical usage levels, DP 385SX maintains the essential mechanical performance of the base TPU—including tensile strength, elongation at break, and abrasion resistance—while significantly improving processability. Any impact on modulus or hardness remains minimal and formulation-dependent.
Q5: What storage conditions are recommended to preserve the integrity of DP 385SX?
A: Store in original sealed packaging at room temperature, away from direct sunlight, moisture, and excessive heat. Prolonged exposure to humid environments may lead to slight agglomeration, though this does not compromise functionality when properly dispersed during compounding.
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