PS-Sabic HIPS 638
PS-Sabic HIPS 638 ist eine High-Impact-Polystyrol (HIPS)-Sorte von SABIC, die für ihre hervorragende strukturelle Zähigkeit, ausgezeichnete Steifigkeit und kontrollierten Schmelzfluss (MFI 8,0 g/10 min) geschätzt wird. Polymerisiert mit kautschukmodifizierten Polybutadien-Domänen, die in einer starren Polystyrolmatrix dispergiert sind, ist dieses opake Harz der globale Standard für schwere Geräteteile, strukturelle Spielzeuge und Elektronikgehäuse. Bei Jucheng Precision, einem nach ISO 9001 und IATF 16949 zertifizierten Hersteller, sind wir auf das Spritzgießen von HIPS 638 ohne Oberflächendefekte spezialisiert. Mit unseren über 25 internen 5-Achs-CNC-Werkzeugen optimieren wir Angussgrößen und Nachdruckprofile, um Einfallstellen an schweren Strukturrippen zu vermeiden, und liefern makellose Komponenten, die durch Zeiss-KMM-Inspektion verifiziert werden.
SABIC HIPS 638 Structural Impact & Toughness Profile
SABIC® HIPS 638 is an opaque, rubber-modified high-impact polystyrene designed to deliver balanced tensile strength, easy flow, and exceptional mechanical stiffness:
| Mechanische Eigenschaft | SABIC HIPS 638 Specs | Technischer Vorteil für Formteile |
|---|---|---|
| Rubber Toughening | Elastomer-Modified Phase Matrix | Incorporates chemically bonded polybutadiene rubber domains, absorbing mechanical impact and preventing brittle stress fractures in structural enclosures. |
| Strukturelle Steifigkeit | Tensile Modulus 2150 MPa | Maintains robust load-bearing stiffness, preventing dynamic bending or deformation in heavy-duty appliance components. |
| Flow Performance | MFR 8,0 g/10 min (200°C x 5 kg) | Ensures a highly uniform melt flow under moderate shear, facilitating fast cycles in multi-cavity hot runner systems. |
Process Compatibility and Mold Setup for SABIC 638
SABIC HIPS 638 processes consistently across various high-volume injection molding configurations:
| Spritzgussverfahren | Prozesseignung & Betriebliche Details |
|---|---|
| Structural Housing Molding | Excellent. Fully optimized for structural home appliance back covers, electronic enclosures, cosmetic displays, and printer trays. |
| Toy & Furniture Molding | Excellent. Supports molding of thick-walled structural toys, snap-fit components, and rigid furniture brackets requiring high durability. |
| Dünnwandige Verpackung | Good. Allows high-pressure injection into thin-walled industrial storage trays and dynamic product containers with reduced cycle times. |
PS-Sabic HIPS 638 Tooling & Sink Mark Mitigation Guide
Molding an amorphous impact-modified grade like HIPS 638 requires careful gate sizing and pressure profiling to prevent cosmetic sink marks and gate blush:
- Mitigating Rib and Boss Sink Marks: HIPS has a low mold shrinkage rate (0.4% to 0.7%), but thick structural ribs can still pull material away during cooling, creating visible sink marks. Jucheng’s tooling division uses Moldflow software to optimize gate placement and designs rib thicknesses to be 50% to 60% of the adjacent wall.
- Tool Steel Selection & Finish: To achieve a pristine satin matte or glossy finish, we construct mold cavities from premium S136 stainless steel hardened to 48–52 HRC. This keeps parting lines razor-sharp and prevents rapid gate erosion.
- Wissenschaftliche Spritzprofilierung: Processing melt temperatures are maintained between 190°C and 240°C (374°F to 464°F). Mold temperatures are kept at 35°C to 55°C (95°F–131°F). Slower injection speeds and progressive pack pressures are applied to avoid shear stress near gates.
- Ejection and Draft Optimization: Because HIPS 638 is highly rigid, deep structural ribs require polished draft angles (minimum 1.5°). We utilize broad ejector pins or stripper bars to prevent part stress and ejection drag marks.
Key Application Fields for PS-Sabic HIPS 638
- Home Appliances: Refrigerator interior components, dynamic door panels, washing machine control trims, air conditioner covers, and vacuum cleaner shells.
- Toys & Children’s Goods: Rigid building block components, durable toy vehicle chassis, play set structures, and children’s study table accessories.
- Industrial & Electronic Casings: Desktop printer trays, computer monitor back housings, industrial equipment control bezels, and secondary storage bins.
Eigenschaften
| Dichte | 1,04 g/cm³ |
| Schmelze-Massefließrate (MFR) (200°C/5,0 kg) | 8.0 g/10 min |
| Zugfestigkeit bei Streckgrenze | 22.0 MPa |
| Zugdehnung beim Bruch | 45 % |
| Zugmodul | 2,150 MPa |
| Biegefestigkeit | 41.0 MPa |
| Biegemodul | 2,150 MPa |
| Izod-Kerbschlagzähigkeit (gekerbt, 23°C) | 140 J/m |
| Rockwell-Härte (L-Skala) | 60 - |
| Vicat-Erweichungspunkt | 95.0 °C |
| Wärmeformbeständigkeitstemperatur (HDT @ 455 kPa) | 93.0 °C |
| Linearer Formschwund | 0.40 - 0.70 % |
| Brennbarkeitsklasse | UL 94 HB - |
| Maximale Bauteilgröße | 1000 x 800 mm |
| Mindestbauteilgröße | 1 x 1 mm |