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Alcryn® 4660BK BLK is a UV‑stable melt‑processable rubber offering excellent weather, oil, and ozone resistance for wire, cable, seals, and industrial parts.
Alcryn® 4660BK BLK is a black melt-processable rubber resin that provides elastic performance without vulcanization. This grade can be processed using standard thermoplastic equipment, such as injection molding, extrusion, calendering, blow molding, and compression molding.
Density: 1.17 g/m³
Density, specific gravity: 1.17 g/cm³
Change in volume (in reference fuel B, 27°C, 168 hrs): 11%
Change in volume (in ASTM #1 oil, 100°C, 168 hrs): −19%
Change in volume (in IRM 903 oil, 100°C, 168 hrs): 10%
Change in volume (in water, 100°C, 168 hrs): 10.0%
Melt viscosity (190°C, 300 sec−1): 370 Pa·s
Tear strength (23°C): 190 lb/in
Tensile strength: 1,130 psi
Tensile elongation at break: 390%
Tensile stress at 100% (1.90 mm): 5.30 MPa
Tensile stress at 100% (125°C, 1.90 mm): 5.30 MPa
Tensile stress at yield (1.90 mm): 12.4 MPa
Tensile stress at yield (125°C, 1.90 mm): 13.1 MPa
Tensile strength at yield (125°C, 1.90 mm): 13.1 MPa
Tensile strain at break (1.90 mm): 270%
Tensile strain at break (125°C, 1.90 mm): 240%
Torsion modulus (24°C, 1.9 mm): 6.8 MPa
Torsion modulus (−20°C, 1.9 mm): 14.3 MPa
Tensile set: 7%
Clash-Berg modulus (−34°C): 68.9 MPa
Tensile elongation at break (125°C, 1.90 mm): 390%
Ductile/Brittle transition temperature: −73.9°C
Ductile/Brittle transition temperature: −53°C
Shore hardness (Shore A): 79
Change in Shore hardness in air (Shore A, 125°C, 168 hrs): −2.0
Change in durometer hardness in air (Shore A, 125°C, 168 hrs): −2.0
Durometer hardness (Shore A, 1.90 mm, compression molded): 57
Compression set (24°C, 22 hrs, Method B): 16%
Compression set (100°C, 22 hrs, Method B): 72%
Compression set (24°C, 22 hrs): 16%
Compression set (100°C, 22 hrs): 72%
Taber abrasion resistance (CS-17 Wheel, 1,000 g, 1,000 cycles): 7.00 mg
Melt temperature: 177°C
Primary Chemistry:
Melt-processable rubber
Rubberlike flexibility without the need to vulcanize
Rubber parts that are slow or costly
Premature failure from UV, ozone, or weather
Noise, vibration, and harsh tactile feel in finished parts
Cracking or stiffness in low-temperature applications
Wire and cable jacketing
Hose and tubing
Seals and gaskets
Weatherstripping and sealing profiles
Handles and grips
Engineering and industrial components
Fabrics, sheets, and coated textiles
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