Zhongtian Hechuang LD251| Low Density Polyethylene Resin | Low Migration for Food & Chemical Flexible Packaging
Product Overview
The Zhongtian Hechuang LD251 is high-quality low density polyethylene resin manufactured by Zhongtian Hechuang Energy Co., Ltd. under the official SINOPEC brand. Produced via mature high-pressure autoclave polymerization technology with strictly controlled uniform formula, this dedicated coating & lamination LDPE grade provides outstanding batch-to-batch consistency and balanced mechanical properties, perfectly matching mass production of various flexible packaging products.
It offers reliable resistance to weak acids, weak alkalis and common organic solvents, retaining stable physical performance under ambient and low-temperature operating conditions. Formulated with low-precipitation virgin raw materials, the resin complies with mainstream global food contact regulations, effectively minimizing additive migration and eliminating the risk of contaminating packaged food or chemical contents. Supported by SINOPEC’s large, stable production facility, we guarantee uninterrupted long-term bulk supply to fulfill large-scale orders from packaging manufacturers worldwide.
Basic Product Specifications
- All listed figures are typical values tested under standard laboratory conditions; 100% virgin pellets packed in original 25kg woven bags.
- Density: 0.92 g/cm³ (ISO 1183)
- Melt Flow Rate (MFR): 2.1 g/10min (190℃/2.16kg, ASTM D1238)Tensile Strength: 20 MPa (ISO 527)Elongation at Break: ≥500% (ISO 527)Flexural Modulus: 800 MPa (ISO 178)
Core Product Advantages
Balanced Rigidity and Flexibility
The Zhongtian Hechuang LD251 achieves a well-tuned balance of moderate rigidity and excellent flexibility. Appropriate stiffness keeps coated films and composite layers flat without sagging during high-speed processing, while superior flexibility allows finished packaging to be folded and bent repeatedly without cracking. This characteristic makes it ideal for multi-layer composite flexible packaging.
Good Chemical Resistance
This LDPE grade withstands erosion from daily weak acids, alkalis and mild organic solvents. When applied to chemical inner lining films and agricultural mulch film, it maintains intact surface structure and stable performance during long-term storage, cutting material replacement frequency and overall production costs.
Low Additive Migration for Food Safety
Built on a low-extraction virgin polymerization formula, LD251 only releases trace additives that fully pass international food contact limit tests. It will not leach harmful substances to contaminate food or liquid chemicals inside packages, making it the safe choice for food bags, squeeze bottles and food container inner liners.
Smooth Melt Flow for High-Speed Coating
Optimized melt fluidity adapts perfectly to high-speed extrusion coating and lamination equipment. It forms uniform thin coating layers without streaks or uneven thickness, shortening molding cycle time and lowering reject rates during continuous mass manufacturing.
Main Application Fields
Food Packaging
- Composite food film, snack packaging pouches, plastic squeeze bottles, inner liners for food containers, extrusion coating layer for paper cups and paper food bags
Chemical Industrial Packaging
- Anti-corrosion flexible chemical bags, inner lining film for liquid chemical storage, industrial composite wrapping film
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Agricultural & Daily Consumer Packaging
Agricultural mulch film, transparent supermarket shopping bags, thin-wall soft plastic daily supplies
Processing & Storage Guidelines
Processing Parameters
- Recommended extrusion barrel temperature range: 180–220°C
- Adjust extrusion speed and temperature zones according to coating thickness and machine model
- LDPE is non-hygroscopic; pre-drying is not required before processing.
Storage Requirements
- Storage ambient temperature: 5–35°C
- Control relative humidity below 70%
- Maximum stacking layers: 5 layers to prevent packaging extrusion deformation
- Valid shelf life: 2 years under sealed, dry and ventilated storage conditions
Frequently Asked Questions
Q1: What is the shelf life of SINOPEC Zhongtian Hechuang LD251 (PE H138)?A1: When sealed and stored in a dry, cool and ventilated warehouse, its valid shelf life reaches 2 years.
Q2: Can this LDPE grade be used for pressure-bearing packaging?A2: It is suitable for low-pressure soft lining films and flexible packaging bags. It is not recommended for thick-wall high-pressure pressure vessels. Please share your specific working conditions for our professional technical evaluation.
Q3: Is LD251 applicable for long-term outdoor use?A3: It can be used for short-cycle agricultural mulch film outdoors. For products requiring long-term outdoor exposure, blending anti-UV masterbatch is necessary to slow yellowing and aging.
Q4: What temperature range is suggested for extrusion coating processing?A4: The standard barrel temperature range is 180–220°C; fine-tune each heating zone based on coating thickness and machine operating speed.
Q5: Does this resin require special protection during ocean transportation?A5: It is non-hazardous chemical raw material without special transport restrictions. Simply keep the original packaging intact to avoid rain soaking and heavy mechanical impact during transit.
Product Summary
The Zhongtian Hechuang LD251 is a cost-effective coating-grade LDPE resin featured with stable melt fluidity, balanced mechanical performance and low additive migration. It covers mainstream downstream applications including food lamination packaging, chemical anti-corrosion lining film and agricultural mulch film.Its reliable processing performance supports high-speed continuous mass production and complies with global food contact environmental standards. Supported by SINOPEC’s stable supply system and comprehensive after-sales technical service, it has become a preferred raw material for flexible packaging manufacturers around the world.Contact our sales team to obtain detailed TDS technical datasheets, free test samples and competitive bulk wholesale quotations.
