PS-Trinseo STYRON 678D

PS-Trinseo STYRON 678D è un polistirene per uso generale (GPPS) di grado ottico progettato da Trinseo, apprezzato per la sua eccezionale chiarezza simile al vetro, elevata resistenza al calore e stampabilità a fusione equilibrata. Con una densità di 1,04 g/cm³ e un indice di fluidità stabile di 10 g/10 min, questo grado è universalmente specificato per contenitori a parete sottile, portagioie e articoli da laboratorio diagnostico. Jucheng Precision, nell'ambito dei quadri ISO 9001 e ISO 13485, eccelle nella lavorazione di STYRON 678D per evitare segni di stress ottico. Supportati dalle nostre oltre 25 macchine CNC a 5 assi interne e strutture in camera bianca, implementiamo percorsi utensile a basso stress per prevenire cricche fragili durante l'espulsione del pezzo.

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Trinseo STYRON 678D Physical and Optical Properties

STYRON™ 678D is a prime general purpose polystyrene (GPPS) resin engineered by Trinseo to deliver glass-like clarity, high thermal stability, and low-stress moldability:

Optical & Structural Property STYRON 678D Typical Value Engineering Molding Advantage
Chiarezza ottica Glass-Like High Light Transmission Provides absolute transparency and high gloss directly from polished core cavities, ideal for medical diagnostics and optical lenses.
Heat Resistance Vicat Softening Temperature 97.2°C Maintains rigid structural geometry under moderate thermal stress. Excellent for display cases and food service packaging.
Food Safety FDA 21 CFR 177.1640 Compliant Ensures complete compliance for contact with food and household consumables, featuring ultra-low volatile outgassing.

Process Compatibility for STYRON 678D

With a Melt Flow Rate of 10 g/10 min, STYRON 678D flows smoothly to support thin-walled, high-volume injection molding runs:

Categoria di processo Molding Strategy & Application Details
Standard & Optical Molding Excellent. Fully optimized for high-transparency medical petri dishes, lab cuvettes, cosmetic display jars, and compact disc jewel cases.
Thin-Wall Packaging Excellent. Stable flow behaviors at low melt temperatures allow rapid, high-pressure injection into thin-walled disposable cutlery and clear tumblers.
Co-Extrusion Cap Coating Good. Highly compatible with other easy-flowing polymers to provide a protective, high-gloss clear outer barrier on structural components.

PS-Trinseo STYRON 678D Tooling & Brittle Fracture Prevention Guide

STYRON 678D is an amorphous resin offering extremely low shrinkage, but its brittle nature (Tensile Strain 1-3%) requires meticulous mold design and process care:

  • Brittle Fracture & Ejection Design: Because GPPS has negligible elongation, parts can crack easily around sharp corners during mold release. Jucheng’s tooling division machines generous draft angles (minimum 1.5° to 2°) and implements broad, strategically positioned ejector pins to distribute demolding forces evenly.
  • Mirror-Surface Mold Polishing: Any microscopic tool mark on core or cavity surfaces will scatter light and compromise optical clarity. We use S136 stainless steel mold cavity blocks, mirror-polished to a pristine finish, to ensure maximum light transmission.
  • Thermal and Pressure Profiles: Processing melt temperatures are kept at 199°C–249°C (390°F to 480°F). Mold temperatures are managed between 17°C and 65°C (63°F–149°F) using pressurized temperature controllers. Slower injection and low holding pressures are applied to avoid residual stresses.
  • Low Isotropic Shrinkage: STYRON 678D exhibits extremely low shrinkage (typically 0.3% to 0.6%). This amorphous behavior enables us to hold extremely tight dimensional tolerances for stackable diagnostic labware.

Key Application Fields for PS-Trinseo STYRON 678D

  • Medical Diagnostics & Labware (ISO 13485): Crystal-clear petri dishes, laboratory test tubes, microplates, transparent cuvettes, and pipette cassettes.
  • Cosmetic & Consumer Packaging: Luxury thick-walled cosmetic jars, transparent covers, CD/DVD jewel cases, and retail display organizers.
  • Thin-Walled Housewares: Disposable plastic cutlery, clear party tumblers, storage canisters, and high-gloss rigid desk organizers.

Proprietà

Densità 1.04 g/cm³
Indice di fluidità a massa fusa (MFR) (200°C/5,0 kg) 10.0 g/10 min
Resistenza alla Trazione 37.2 MPa
Allungamento a rottura in trazione 1.0 - 3.0 %
Resistenza a flessione 57.9 MPa
Modulo a flessione 3,378 MPa
Izod Impact Strength (Notched) 21.4 J/m
Rockwell Hardness (L-Scale) 107 -
Punto di rammollimento Vicat 97.2 °C
Deflection Temperature Under Load (DTUL @ 66 psi) 86.1 °C
Ritiro da stampaggio lineare 0.3 - 0.6 %
Flammability Rating (1.6mm) UL 94 HB -
Dimensione massima del pezzo 800 x 600 mm
Dimensione minima del pezzo 1 x 1 mm