Wankai PET WK-811 for Hot-filling Bottles

PET WK-811 is a hot-fill grade polyethylene terephthalate resin developed by Zhejiang Wankai New Materials Co., Ltd. It is a TPA-based homopolymer PET specifically designed for hot-fill beverage bottles, such as juice, tea, and other drinks that require sterilization through high-temperature filling. The Wankai PET resin provides excellent heat resistance, clarity, and color stability, making it ideal for bottles that must maintain strength and transparency during hot-fill and cooling processes.

Parameter	Unit	Value	Test Method
Intrinsic Viscosity	dL/g	0.790±0.015	Q/WK007
Acetaldehyde Content	μg/g	≤1.0	Q/WK007
Color (L-value)	—	≥83.0	Q/WK007
Color (b-value)	—	≤-0.5	Q/WK007
Peak Temperature when Melting（DSC by Nitrogen）	°C	251± 2	Q/WK007
Moisture Content	%	≤0.20	Q/WK007

Main Characteristics of PET WK-811

Excellent Heat Resistance: Designed for hot-fill processes; maintains shape and strength under 70–90 °C filling and pasteurization.
Low Acetaldehyde (AA): Acetaldehyde ≤ 1 ppm ensures beverages retain original flavor without any odor.
Superior Clarity and Color: With L ≥ 83 and B ≤ -0.5, WK-811 produces bottles with brilliant transparency and clean appearance.
High Processing Stability: Low degradation rate and consistent intrinsic viscosity enable efficient molding with minimal material variation.
Food-Contact Safety: Designed to meet international standards for food and beverage packaging applications.

Typical Applications

Wankai PET WK-811 is mainly used for hot-fill and heat-resistant beverage containers, including:

Hot-fill bottles for tea, fruit juice, sports drinks, and functional beverages.
Bottles that require high dimensional stability and resistance to deformation during filling and storage.
Transparent, heat-resistant containers for food and beverage packaging.
Other clear, heat-stable packaging applications such as condiment or edible-oil bottles.

Processing Recommendations

To achieve optimal results, the following processing guidelines are recommended:

Pre-Drying

PET must be fully dried before processing to prevent hydrolysis or degradation.

Drying temperature: 160–180 °C
Drying time: 4–6 hours
Target moisture: ≤ 0.20 wt%

Processing Conditions

Due to the high melting point (~ 249 °C), use appropriate melt and mold temperatures to ensure proper crystallization and mechanical strength.

Blow Molding Considerations

For hot-fill bottles, maintain adequate crystallinity and wall uniformity to prevent shrinkage or deformation.

Color Control

Maintain raw-material purity and avoid contamination or excess additives to achieve desired color (L/B values).

Storage

Store in a dry, ventilated place away from direct sunlight. Once opened, use promptly to avoid moisture absorption.