Sinopec Zhenhai Refining DFDA-7042: Official and Field-Tested Core Performance

1. Basic Specifications

• Grade: DFDA-7042 (Sinopec Zhenhai Refining, Sinopec system)
• Resin Type: Film-grade linear low-density polyethylene (LLDPE)
• MFR (190℃/2.16kg): 1.8–2.2 g/10min, stably maintained at 2.0 g/10min
• Density: 0.918–0.920 g/cm³
• Appearance: Milky white virgin pellets, non-toxic, tasteless and odorless

2. Mechanical Performance (Official & Field Tested)

• Tensile yield strength: ≥8.3 MPa
• Tensile breaking strength: ≥12 MPa
• Elongation at break: >750%, outperforming conventional generic DFDA-7042
• Flexural modulus: Approximately 1150 MPa
• Impact and barrier performance: Excellent puncture resistance, tear resistance and impact resistance; strong environmental stress cracking resistance (ESCR)

3. Optical and Processing Performance

• Haze: Approximately 10.4% with premium light transmittance
• Fish eye index: Extremely low fish eyes, only 7 fish eyes above 0.8mm per 1520cm²
• Thermal processing stability: Smooth processing within 180℃ to 220℃, low mold adhesion during continuous blown film production

4. Temperature Resistance and Weatherability

• Brittleness temperature: Approximately -70℃; softening temperature: approximately 105℃
• Anti-aging and UV resistance: Optimized formula customized for long-service-life agricultural films
• Chemical resistance: Resistant to acid, alkali and most organic solvents; compliant with food contact material standards

5. Core Competitive Advantages vs. Other Generic 7042 Grades

5.1 Strict large-scale plant quality control with ultra-stable batch consistency

Supported by Zhenhai Refining’s mature polymerization process and exclusive catalyst system, the resin has negligible fluctuation in MFR and density. Blown films show uniform thickness, which greatly reduces rewinding material loss.

5.2 Dual optimization of rigidity, toughness and weather resistance

It has slightly higher rigidity and superior toughness than ordinary DFDA-7042, bringing stronger wind resistance and puncture resistance for thin films. The built-in anti-aging additive formula extends the service life of outdoor agricultural films.

5.3 High compatibility with high-speed blown film lines

Pre-added slip and anti-blocking additives ensure stable film blowing and excellent opening performance. It avoids frequent film breakage and unplanned downtime on high-speed production lines.

5.4 Ultra-low impurities and high optical clarity

Extremely few colored particles (≤3 particles per kilogram) and low haze, meeting high-transparency requirements for food packaging and agricultural light-transmitting films.

5.5 Robust supply chain and stable delivery

Backed by Zhenhai large-scale petrochemical base with sufficient spot inventory. It passes delivery inspection exemption on Dalian Commodity Exchange and enjoys high market liquidity.

6. Cost-Performance Analysis (May 2026, Ningbo & East China Market)

• Price vs imported equivalent LLDPE (e.g. 219ZJ): 5%–8% lower with matching core performance
• Price vs metallocene LLDPE: Over 30% cheaper, fully meeting general blown film production demands
• Cross-resin comparison: Higher tensile strength and material-saving than LDPE; better flexibility and easier processing than HDPE

Comprehensive Long-term Cost Benefits

Durable finished products lower rework rates; stable processing cuts production loss and improves equipment operating rate, delivering lower overall life-cycle costs.

7. Typical Application Scenarios

Agricultural mulch films, greenhouse films, packaging stretch films, garbage bags, container inner liners and functional coating substrates