Hytrel® TPC-ET HTR8745 BK320

Hytrel TPC-ET HTR8745 BK320 is a medium-modulus thermoplastic polyester elastomer (TPC-ET) with a nominal hardness of 45D (40D at 15s). This black grade is pigmented with fine-particle carbon black and contains a general-purpose stabilizer. Designed for blow molding or processing methods requiring high melt viscosity, it provides excellent toughness, resilience and flexibility at low temperatures, while maintaining strong mechanical performance at elevated temperatures. Hytrel TPC-ET HTR8745 BK320 demonstrates outstanding resistance to creep, impact and flex fatigue, and delivers high tear strength and abrasion resistance. It also shows good resistance to oils, fuels, solvents and many industrial chemicals.

Key Features:

• Medium-modulus grade (45D)
• Black, heat- and light-stabilized formulation
• High melt viscosity suited for blow molding
• Excellent toughness and impact resistance
• Outstanding creep, tear and flex fatigue resistance
• Good resistance to oils, fuels, solvents and industrial chemicals
• Very low brittleness temperature (–42°C glass transition)
• Plasticizer-free with long-term property stability

Processing Form:

• Injection Molding
• Extrusion
• Sheet Extrusion
• Other Extrusion
• Coating
• Blow Molding

Processing Notes:
Drying is recommended at 110°C for 2–4 hours to achieve a processing moisture content ≤0.08%. Hytrel TPC-ET HTR8745 BK320 has an optimal melt temperature of 240°C (min. 230°C, max. 250°C) and an optimal mold temperature of 45°C (45–55°C). For extrusion, dry at 100°C for 2–3 hours to achieve ≤0.06% moisture and process at an optimal melt temperature of ~240°C. For blow molding, ensure moisture ≤0.02% before processing. Hytrel is incompatible with acetal and PVC. Please refer to the molding and extrusion guidelines for detailed recommendations.