CR-5531 is an injection-grade, high-flow modified polyethylene terephthalate glycol (PETG) copolyester resin developed by China-based China Resources Chemical. As a non-crystalline thermoplastic, PETG CR-5531 combines excellent clarity, chemical resistance, and processing stability, making it suitable for both thin-wall and thick-wall injection-molded parts, especially where superior appearance and transparency are required.

Property

Unit

Value

Description

Intrinsic Viscosity

dL/g

0.680 ± 0.02

Indicates molecular weight level

Color Value (L)

—

≥ 58

High brightness

Color Value (b)

—

0 ± 0.8

Neutral color tone

COOH End Group Content

mmol/kg

≤ 30

Low terminal carboxyl value

Density

g/cm³

1.28 ± 0.10

Physical density

Light Transmittance

%

≥ 90

Indicates high optical clarity

Key Features of CR-5531 PETG

  • High Fluidity: Specifically engineered for injection molding, allowing for efficient filling of intricate and thin-walled components.
  • High Transparency: Ensures excellent clarity with over 90% light transmittance, suitable for aesthetic and optical applications.
  • Good Chemical Resistance: Maintains structural integrity against a variety of chemical agents under general conditions.
  • Environmentally Friendly: BPA-free and phthalate-free, in compliance with safety regulations for medical, cosmetic, and food-contact applications.
  • Excellent Processability: Provides stable thermal behavior during injection molding and post-processing, with good surface gloss and minimal warpage.

Typical Applications

  • Cosmetic Packaging: Bottles, jars, lids, and clear display parts.
  • Clear Storage Containers: Household or industrial storage applications with high visibility.
  • High-Flow, High-Transparency Injection Parts: Shields, display boxes, decorative elements.
  • 3D Printing: Can be used in high-speed 3D printing (up to 300 mm/s) in pellet form, thanks to its low viscosity and good melt flow.

Processing Guidelines

PETG CR-5531 is optimized for injection molding, offering good melt fluidity and stable behavior under recommended processing conditions.

  • Suitable for thin-walled or complex geometries due to high flow rate.
  • Requires adequate moisture control during storage and processing, as PETG materials are sensitive to hydrolysis.
  • Mold temperature, nozzle temperature, and cooling cycles should be properly managed to prevent internal stress and ensure optimal clarity and dimensional stability.
  • Compatible with standard color masterbatch, though transparency and shade consistency should be monitored if color is required.

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