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Thermoplastic elastomer based on styrenic block copolymer (SBC) with polystyrene end blocks and polyisoprene mid-blocks.
Excellent processability via injection molding, extrusion, and overmolding onto polypropylene (PP) and polyethylene (PE).
Good elasticity and recovery at room temperature with low permanent set (<25% after 24h compression at 23°C).
Non-toxic, halogen-free formulation compliant with FDA 21 CFR §177.2600 for incidental food contact applications.
Enhanced grip and soft-touch surface finish suitable for ergonomic consumer product components.
Soft-grip handles for power tools and garden equipment.
Sealing rings and gaskets in automotive fluid systems.
Overmolded grips for medical device housings and surgical instrument handles.
Consumer electronics casings requiring tactile feedback and shock absorption.
Reusable packaging closures and snap-fit lids for personal care containers.
| Chemical Type | Styrenic Thermoplastic Elastomer (S-TPE) |
| Product Form | Pellets (natural color, free-flowing) |
| Appearance | Translucent off-white granules |
| Hardness (Shore A) | 55 ± 3 |
| Melt Flow Rate (230°C/2.16 kg) | 18–22 g/10 min |
| Density | 0.91–0.93 g/cm³ |
| Tensile Strength (ASTM D412) | 12–15 MPa |
| Elongation at Break (ASTM D412) | 650–750 % |
Q1: What is the primary functional role of API 1559-01/PS TPE in polymer formulations?
A: API 1559-01/PS TPE functions as a thermoplastic elastomer modifier, enhancing flexibility, impact resistance, and melt-processability in styrenic-based systems—particularly in applications requiring balanced hardness, elasticity, and thermal stability.
Q2: Is API 1559-01/PS TPE compatible with common engineering thermoplastics beyond polystyrene?
A: Yes—it demonstrates good compatibility with a range of styrenic copolymers and select polyolefins. Compatibility with polar resins (e.g., polyesters or nylons) may require compatibilization or formulation optimization, and is best evaluated through small-scale rheological and morphological testing.
Q3: How does processing temperature affect the performance of API 1559-01/PS TPE during extrusion or injection molding?
A: API 1559-01/PS TPE exhibits a typical processing window between 170 °C and 220 °C. Within this range, it maintains thermal stability and phase integrity; prolonged exposure above 230 °C may lead to gradual degradation of elastomeric domains and reduced mechanical recovery.
Q4: Can API 1559-01/PS TPE be used in applications requiring regulatory compliance for indirect food contact?
A: While API 1559-01/PS TPE is not pre-certified for food-contact use, its base components are selected to support regulatory pathways. Final compliance depends on the full formulation, processing conditions, and end-use requirements—formulators should conduct appropriate migration and toxicological assessments per applicable regional frameworks.
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