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High elasticity and fatigue resistance, high elongation and good resilience, suitable for fatigue-resistant applications
Excellent weather resistance, UV, oxidation and chemical resistant, strong environmental stability
Superior low-temperature toughness, no brittle fracture at low temperature, suitable for low-temperature scenarios
Easy processing, adaptable to multiple molding processes, improving production efficiency
High transparency, meeting appearance requirements, significant toughening effect on PP and other substrates
Good compatibility, forming stable bonding with PP, activated calcium carbonate, etc.
Automotive Industry: Sealing strips, shock pads, interior parts, enhancing sound insulation and comfort
Electronics & Electrical: Wire and cable sheaths, improving wear resistance and usage safety
Building Materials: Window and door sealing strips, enhancing waterproof performance and durability
Medical Devices: Hoses, connectors, complying with hygiene and safety standards
Shoe Materials: Soles and midsoles, providing shock absorption and wearing comfort
Plastic Modification: Toughener for PP/PE, improving the toughness and processability of substrates
| Physical Properties | |
| Density | 0.885 g/cm³ (ASTM D1505) |
| Thermal & Flow Properties | |
| Melt Flow Rate | 1.0 g/10 min (ASTM D1238) |
| Melting Point | -74 °C (SK Method) |
| Mooney Viscosity | 21 MU (ASTM D1646) |
| Mechanical Properties | |
| Tensile Strength at Break | 16.7 MPa (ASTM D638) |
| Elongation at Break | 700 % (ASTM D638) |
| Tensile Modulus | 4.6 MPa (ASTM D638) |
| Flexural Modulus | 29.4 MPa (ASTM D790) |
Q1: What is the primary function of SK Chemicals 891 in polymer formulations?
A: SK Chemicals 891 is an acrylic-based impact modifier designed to significantly enhance the toughness and low-temperature impact resistance of rigid thermoplastics—particularly PVC, PS, and engineering resins—without compromising clarity or processability.
Q2: Is SK Chemicals 891 compatible with unplasticized PVC (uPVC) compounds?
A: Yes, it exhibits excellent compatibility with uPVC and is widely used in window profiles, pipes, and siding applications to improve notch sensitivity and prevent brittle fracture during extrusion and end-use conditions.
Q3: How does SK Chemicals 891 affect processing behavior in extrusion or injection molding?
A: It demonstrates good thermal stability and melt compatibility, supporting smooth extrusion and consistent dispersion. Users typically observe minimal effect on melt viscosity and no adverse impact on cycle times under standard processing conditions.
Q4: What is the recommended dosage range for optimal performance?
A: Dosage depends on the base resin, desired impact performance, and regulatory or mechanical requirements—but it is typically used at low concentrations, generally ranging from 0.1% to 2% by weight relative to the polymer matrix.
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E-mail: wangxingqiang@ericwchem.com
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Building A1, Jiete Industrial Park, Huangpu District, Guangzhou City, Guangdong Province, China
