Hytrel® TPC-ET HTR4275 BK316

Hytrel TPC-ET HTR4275 BK316 is a medium-modulus thermoplastic polyester elastomer (TPC-ET) with a nominal hardness of 55D (52D at 15s). This black grade is pigmented with fine-particle carbon black and contains a general-purpose heat and light stabilizer. Designed for blow molding, extrusion and other high-viscosity processing techniques, it offers excellent toughness, resilience and low-temperature flexibility while maintaining strong mechanical performance at elevated temperatures. Hytrel TPC-ET HTR4275 BK316 provides outstanding resistance to creep, impact and flex fatigue, exceptional tear strength, and reliable performance under demanding environmental conditions. It also demonstrates good resistance to oils, fuels, solvents and many industrial chemicals.

Key Features:

• Medium-modulus grade (55D)
• Black, heat- and light-stabilized formulation
• High melt viscosity for blow molding
• Excellent toughness and high impact resistance
• Outstanding creep, tear and flex fatigue resistance
• Very low brittleness temperature (–100°C)
• Good resistance to oils, fuels, solvents and industrial chemicals
• Stable melt behavior for extrusion and blow molding
• Plasticizer-free with long-term property retention

Processing Form:

• Injection Molding
• Extrusion
• Blow Molding
• Thermoforming

Processing Notes:
Drying is recommended at 100°C for 2–4 hours to achieve a processing moisture content ≤0.08%. Hytrel TPC-ET HTR4275 BK316 has an optimal melt temperature of 230°C (range 220–250°C) and an optimal mold temperature of 40°C (30–41°C range). For extrusion, dry at 100°C for 2–3 hours to reach ≤0.06% moisture and process at 205–220°C melt temperature. For blow molding, dry at 90–100°C for 4–6 hours with moisture ≤0.03% and process at 230°C (range 220–240°C). Hytrel is incompatible with acetal and PVC. Refer to molding and extrusion guidelines for complete recommendations.