Discover Wankai PET Resin WK821, a premium food-grade polyester plastic raw material. Featuring high transparency, low acetaldehyde, and 0.830 dL/g I.V., it is ideal for edible oil bottles and packaging.
| Manufacturer | Wankai |
|---|---|
| Intrinsic Viscosity | 0.83± 0.020 dL / g |
| Acetaldehyde Content | ≤ 1.0 μg / g |
| Melting Point | 243± 2 ℃ |
Note: See the product description for additional technical specifications
Wankai PET Resin WK821 is a high-performance bottle-grade PET polyester chip developed and manufactured by Wankai New Materials Co., Ltd. Wankai New Materials is a leading enterprise in the R&D, production, and sales of polyester materials in China. It has established an annual production capacity of 3 million tons of bottle-grade PET chips, ranking among the top globally. Its products are exported to more than 100 countries and regions, long serving world-renowned beverage brands such as Coca-Cola, PepsiCo, and Danone. WK821 belongs to TPA-based polyethylene terephthalate copolymer. Its physical form consists of white or light yellow transparent pellets designed with blow molding grade properties, making it suitable for the production of various high-requirement bottles and containers. This grade features a narrow molecular weight distribution, stable intrinsic viscosity, extremely low metal content, extremely low acetaldehyde content, and excellent color values, which can meet the processing demands of thicker and larger products such as edible oil bottles, liquor bottles, medicine bottles, carbonated beverage bottles, and PET sheets. As the flagship model of Wankai New Materials’ oil bottle grade PET series, WK821 has established a benchmark position in the high-barrier packaging field due to its outstanding transparency and crystallization performance. It is widely applied in food and beverage packaging, medical containers, agrochemical packaging, and various other industries.
| Property | Unit | Center Value | Limit Value | Test Standard |
| Intrinsic Viscosity (I.V.) | dL / g | 0.83 | ± 0.020 | Q/WK007 |
| Acetaldehyde Content | μg / g | — | ≤ 1.0 | Q/WK007 |
| Color Value (L-value) | — | — | ≥ 83.0 | Q/WK007 |
| Color Value (b-value) | — | — | ≤ -0.5 | Q/WK007 |
| Melting Point | ℃ | 243 | ± 2 | Q/WK007 |
| Moisture Content (Mass Fraction) | % | — | ≤ 0.20 | Q/WK007 |
The technical data sheet (TDS) of WK821 material from Wankai New Materials Co., Ltd. corporation, if there are differences, please refer to the official website of Wankai New Materials
With its excellent material science design, WK821 exhibits the following core competitive advantages in the bottle-grade PET field: Excellent High Transparency and Gloss: WK821 features outstanding clarity and a high-gloss appearance, with an L-value of ≥83.0, providing end products with an exceptionally clear and bright visual effect. This property makes it highly competitive in applications where visual aesthetics are crucial, such as high-end food and beverage packaging and cosmetic containers, significantly enhancing the shelf appeal of final products. High Barrier Properties: Bottles and containers made of WK821 exhibit superb barrier characteristics, offering excellent resistance against oxygen, carbon dioxide, and moisture. This effectively extends the shelf life of products, making it particularly suitable for carbonated beverage bottles and edible oil packaging with strict moisture-proof requirements. Outstanding Chemical Resistance: WK821 possesses excellent resistance to grease, acids, and alcohols. It can withstand erosion from fatty acids in edible oils, acidic components in beverages, and alcoholic liquids, ensuring that the packaging does not undergo performance deterioration due to chemical reactions during long-term storage. Excellent Processing Performance: WK821 features a wide processing temperature window (melt temperature of 260–285°C), offering broad processing flexibility and great molding stability, which meets the processing demands of thick-walled and larger products. This material is not only suitable for blow molding but also compatible with injection molding, extrusion, and various other molding processes, providing manufacturing enterprises with flexible production options. High Crystallinity and High Strength: WK821 displays excellent crystallization performance (crystallinity of 28–32%), resulting in high strength and high yield rates of final products. Its relatively high intrinsic viscosity (0.83 dL/g) ensures sufficient molecular weight to resist environmental stress cracking (ESCR) while maintaining good flow characteristics, achieving an ideal balance between strength and processability. Low Acetaldehyde and Food Safety Compliance: The acetaldehyde content of WK821 is extremely low (≤1.0 ppm). The product complies with the GB 4806.6 Chinese food safety standard and international food contact material safety regulations. It has also obtained FDA and EU regulatory approvals, making it completely safe for direct-contact food and beverage packaging applications.
With its high transparency, high barrier performance, excellent chemical resistance, and stable processing properties, WK821 is widely utilized in a variety of industry scenarios: Food & Beverage Packaging: One of the core application fields for WK821 is food and beverage packaging. This material is suitable for the production of carbonated soft drink (CSD) bottles, meeting the stringent requirements for bottle strength and gas barrier properties. Due to its superior fat and grease resistance, WK821 is also an ideal choice for high-quality edible oil packaging containers. In beverage packaging, this grade is widely used for mineral water and beverage bottles, delivering visually appealing, safe, and hygienic products. Alcoholic Beverage Packaging: The high transparency and excellent alcohol resistance of WK821 make it a preferred material for Chinese liquor (Baijiu) bottles and spirits bottles. It fully displays the clear color of the liquid while maintaining stable chemical performance during long-term contact with alcohol. Medical & Pharmaceutical Packaging: The material can be used for medicine bottles, medical device packaging containers, and other medical-grade applications. Wankai New Materials has developed medical-grade PET products, and WK821, with its low acetaldehyde and high purity features, shows excellent suitability in the pharmaceutical packaging sector. APET Sheet & Thermoforming: WK821 can also be used in the extrusion of APET sheets. The produced sheets are ideal for thermoformed products such as blister trays, food packaging boxes, and electronic trays, offering high transparency and excellent toughness. Agrochemical Product Packaging: With its high-barrier design, WK821 meets the stringent requirements for safety and chemical stability in agrochemical packaging (such as pesticides and fertilizers), effectively preventing chemical leakage and external environmental penetration. Daily Chemical & Household Products: WK821 is widely applied in cosmetic bottles, toiletry containers, and other daily household packaging. Its high transparency and excellent surface gloss significantly upgrade the visual quality of the products.
Q1: What is the intrinsic viscosity (I.V. value) of WK821? Why is this parameter important?
The center value of WK821’s intrinsic viscosity is 0.830 dL/g, with a tolerance limit of ±0.020 dL/g. I.V. is a key index for measuring the molecular weight of PET resin, directly affecting the melt strength of the material and the mechanical properties of final products. An I.V. value of 0.83 belongs to the medium-to-high viscosity range for bottle-grade PET, which provides good flow characteristics during injection molding while keeping sufficient molecular weight to resist stress cracking. This enables it to meet the requirements of multiple application scenarios, from standard bottle blowing to thick-walled sheet production.
Q2: Does WK821 comply with food safety certification requirements?
Yes. WK821 complies with the GB 4806.6 Chinese food safety standard, and its acetaldehyde content is strictly controlled at a level of ≤1.0 ppm. Additionally, Wankai New Materials’ bottle-grade PET series has obtained FDA certification and complies with EU regulations, making it safe for direct food and beverage contact packaging applications.
Q3: What are the main processing methods for WK821? What precautions should be taken during processing?
WK821 is suitable for blow molding and can also be processed via injection molding, extrusion, and other methods. Recommended processing parameters are as follows: drying temperature of approximately 170°C, and the drying dew point must be controlled below -40°C. Since the technical data sheet indicates a melting point of 243°C, the actual melt temperature during processing is recommended to be controlled within the range of 260–285°C. Due to the strong hygroscopicity of PET material, thorough drying is essential prior to processing; it is recommended to use the dried material within 4 hours to ensure product transparency and mechanical properties. While PET resin itself does not have a strict shelf life expiration, indoor storage is recommended, and the material should ideally be used within two years of purchase and as soon as possible after opening the packaging.
Wankai New Materials Co., Ltd. (referred to as “Wankai New Materials”, Stock Code: 301216) was established in 2008 and is headquartered in Jianshan New District, Haining, Jiaxing City, Zhejiang Province. It is a leading enterprise in China for the R&D, production, and sales of polyester materials. The company’s main products include bottle-grade PET and bright PET chips, with bottle-grade PET revenue accounting for over 90% of its main business revenue. The company has established an annual capacity of 3 million tons of bottle-grade PET chips, ranking among the top globally. Its products are exported to more than 100 countries and regions, and it has established long-term strategic cooperative relationships with internationally renowned brands such as Coca-Cola, PepsiCo, and Danone.
