Wankai PET WK-781 is classified as a food-grade and bottle-grade PET material. This grade offers excellent clarity, stable processing behavior, and low impurity levels, making it suitable for a wide range of consumer packaging applications. So WK-781 resin is widely used to manufacture transparent bottles, jars, boxes, and cosmetic containers, especially those requiring excellent optical appearance and low acetaldehyde content.

Technical Specifications of Wankai PET WK-781

Property

Unit

Typical Value

Intrinsic Viscosity (IV)

dL/g

0.780 ± 0.015

Acetaldehyde Content (AA)

μg/g

≤ 1.0

Color – L Value

—

≥ 83.0

Color – b Value

—

≤ –0.5

Melting Peak Temperature

°C

245 ± 2

Moisture Content

%

≤ 0.20

Main Performance Advantages

  • Food-grade safety. Low acetaldehyde content and compliance with global food-contact standards make WK-781 suitable for sensitive packaging applications.
  • Excellent transparency and appearance. The resin delivers high brightness, low yellowness, and superior clarity, enabling attractive display packaging.
  • Strong and stable processing performance. For example, smooth feeding, fast crystallization,stable blow-molding behavior, and consistent production quality in high-speed lines.
  • Lightweight & Highly recyclable. Wankai WK-781 supports sustainability requirements in modern packaging.
  • Versatile application compatibility. Suitable for both injection molding and two-stage stretch blow molding (ISBM), meeting various container design needs.

Typical Applications

  • Food and beverage packaging. It is suitable for still water bottles, juice bottles, edible oil containers, aseptic filling bottles, and transparent condiment containers.
  • Cosmetics and personal care sector. PET WK-781 is commonly applied to lotion bottles, shampoo and body wash containers, as well as makeup and beauty packaging.
  • For household and consumer products, the resin can be used to produce storage boxes, document cases, clear jars, small containers, and transparent display packaging.
  • Additionally, Wankai WK-781 is ideal for other specialty uses where high clarity, hygiene, and chemical stability are required.

Processing Recommendations

  • Drying: Ensure the moisture level is ≤0.2% before processing to prevent hydrolysis, haze, or bubbles.
  • Injection temperature: Typically 260–280°C
  • Hot runner systems: Should be optimized to avoid AA formation and discoloration.
  • Blow molding: Suitable for high-speed blow molding lines with stable bottle formation.

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