Sinopec 1C7A LDPE Coating Grade

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1C7A LDPE produced by Sinopec Yanshan Petrochemical is a general-purpose extrusion coating resin prepared using a high-pressure autoclave process. With its balanced performance and stable quality, it has become a preferred material for mid-to-high-end packaging and related fields. Yanshan 1C7A LDPE is a natural-colored granular material without added additives. It is non-toxic, tasteless, and odorless, fully complying with relevant food hygiene standards. Its performance advantages stem from its wide molecular weight distribution and high branching degree, combined with precise process control, resulting in the core characteristics of “excellent processability, strong compositeability, and wide adaptability.”

Yanshan 1C7A LDPETechnical Specification

Properties	Value
Density	0.917g/cm³
Melt Index	6.9g/10min
Tensile strength at yield	8.8Mpa
Elongation	230%

What Are Superior Properties of LDPE 1C7A

High transparency (haze ≤0.8%), excellent resistance to oil penetration (24h oil penetration <0.05g), and a surface micro-roughness. It provide a good foundation for subsequent processes such as vacuum coating. It also possesses excellent cold resistance, with an extremely low-temperature embrittlement temperature, maintaining flexibility and resisting hardening and cracking even under refrigerated and frozen conditions.
Strong processing adaptability:Adaptable to various processing methods such as extrusion coating, blown film, and injection molding, with extrusion coating being its core application process. The recommended processing temperature range is 270-335℃. During processing, the melt flow is stable, minimizing issues like agglomeration and carbonization, thus reducing production energy consumption and scrap rates.
Good molding stability:Its wide molecular weight distribution allows for strong adaptability to temperature and pressure fluctuations during processing. Molded products have uniform thickness, smooth surfaces, and are free of obvious streaks or fisheye defects, enhancing the product’s appearance and texture.
Excellent composite performance:It exhibits extremely high composite strength with various substrates such as paper, cardboard, BOPP, BOPET, BOPA, and aluminum foil. Delamination and wrinkling are less likely after coating, ensuring the sealing and durability of subsequent packaging products.
Safety and chemical stability:It has passed relevant food hygiene certifications and can be directly used for food and pharmaceutical packaging. It also passes ISO 10993 biocompatibility testing and can be used for medical device blister pack liners and heat-sealing of sterilization bags. It exhibits good resistance to common chemicals such as acids, alkalis, and salts, is not easily corroded, and also possesses certain anti-aging properties.

What Are Main Applications of Sinopec 1C7A LDPE?

>> Core Application: Extrusion Coating

Packaging Substrate Coating: Used for extrusion coating of substrates such as paper, cardboard, aluminum foil, and BOPP. After coating, it can be used to make food packaging, liquid packaging, powder packaging, pharmaceutical packaging, agricultural material packaging, and chemical packaging, which can improve the barrier properties of the packaging while ensuring its safety and aesthetics.
Daily Packaging Coating: Used for coating paper cups, bowls, and laminated packaging paper. As an inner layer film material, it can effectively prevent liquid leakage while ensuring safety in contact with food.
Specialty Coating Applications:Pretreatment for vacuum coating of SiOx, AlOx, etc. Used in products such as label transfer film and photo paper film, its surface microstructure provides the physical basis for coating continuity. It can also be used for coating woven bags to improve the waterproofness and durability of woven bags, suitable for the production of agricultural and industrial woven bags.

>> Film and Injection Molding Applications

Film Products: Can be used to produce single-layer or multi-layer composite films, such as food packaging films, frozen food packaging bags, and agricultural films. Particularly suitable for cold chain transportation packaging, preventing film brittleness at low temperatures.
Injection Molding and Flexible Products:Can be used for injection molding of soft bottle cap liners, cosmetic tubes, and other everyday consumer parts. It can also serve as the intermediate layer in a three-layer co-extrusion structure, providing adhesion and toughness buffering, replacing some EAA adhesive resin, reducing production costs while maintaining composite performance.

>> Other Applications: Industrial and Medical Auxiliary Applications

In the industrial field, it can be used to make protective sleeves and linings for low-temperature environments, providing cushioning and isolation. In the medical field, in addition to heat-sealing sterilization bags and blister pack liners for instruments, it can also be used in simple medical packaging materials to meet basic protection and sterilization needs.

FAQs of 1C7A LDPE

1. What is the production process of Sinopec 1C7A?

1C7A is produced by Sinopec Yanshan Petrochemical using a high-pressure autoclave process. Its core characteristics are the absence of additives, a wide molecular weight distribution, and a high degree of branching. Its main advantage lies in its extrusion coating performance, offering superior composite strength and heat-sealing properties while maintaining processing stability and safety, making it more suitable for mid-to-high-end coating and packaging applications.

2. How to control the processing temperature range of 1C7A?

When using 1C7A for extrusion coating, the recommended processing temperature is 270-335℃. For processes such as blown film and injection molding, the temperature can be adjusted appropriately according to product requirements. Excessive temperature can lead to material degradation, resulting in problems such as yellowing, embrittlement, and surface bubbles in the product, while also reducing melt strength and affecting coating uniformity. Insufficient temperature will lead to insufficient melt flow, resulting in uneven coating, weak bonding, delamination, and increased scrap rate.

3. Can 1C7A be used for food packaging?

Yes. 1C7A is a non-toxic, tasteless, and odorless natural-colored granule, without any harmful additives, and fully complies with food hygiene requirements. It can pass relevant food packaging material certifications and can be directly used for packaging food, beverages, powders, and other products. It also possesses good oil and water resistance, extending the shelf life of food.

4. Can 1C7A be blended with other plastic materials?

It can be blended with other LDPE types, LLDPE, and other plastic materials. Blending can adjust the flexibility, heat-sealing properties, and other characteristics of the finished product to suit different application scenarios. For example, blending with a small amount of LLDPE can optimize the optical properties of the heat-sealing layer and solve the problem of whitening at the seal after high-temperature filling.

Sinopec 1C7A LDPE