This professional guide analyzes five mainstream PE grades for industrial plastic molding production scenarios.
It comprehensively compares key polyethylene data including density and melt flow index for accurate reference.
The guide deeply interprets core physical properties and real-world practical uses of common PE materials.
It enables manufacturers to pick the most suitable PE grade for various blow molding production processes.
This resource also provides reliable selection guidance for all types of industrial injection molding tasks.
1. HDPE (High-Density Polyethylene)
HDPE is a low-pressure polyethylene material featuring high structural density and strong overall rigidity.
This rigid plastic material is widely adopted in the manufacturing of various solid plastic finished products.
Three classic HDPE grades cover nearly all conventional and mainstream industrial production scenarios.
The mainstream HDPE models include the classic 5502, versatile 5000S and high-fluidity 8008H grades.
1.1 HDPE 5502
Density: 0.954 | Melt Flow Index (MFI): 0.25 for professional hollow molding production use.
This HDPE grade possesses ultra-high structural rigidity and surface hardness among common plastic materials.
It delivers outstanding resistant performance against acid, alkali and daily industrial corrosive substances.
Its compact and dense molecular structure brings excellent overall structural stiffness to finished products.
This material only maintains moderate toughness compared with other conventional polyethylene grades.
Products made from HDPE 5502 tend to turn brittle under extreme low-temperature environments.
Applicable Scenarios: It serves as a dedicated HDPE resin for industrial professional blow molding processes.
Manufacturers use this grade to produce industrial chemical drums and sealed industrial oil cans.
It is also ideal for making daily chemical bottles and large-scale industrial hollow container products.
1.2 HDPE 5000S
Density: 0.950 | Melt Flow Index (MFI): 0.9 for balanced daily industrial molding production.
This practical HDPE grade achieves a perfect balance between structural rigidity and material toughness.
It features excellent tensile strength and durable wear resistance for long-term service life.
The grade ensures stable processing performance and high cost-effectiveness for mass production.
Applicable Scenarios: It is widely used to produce plastic filaments, packaging bags and sturdy plastic ropes.
It perfectly fits the production of daily injection-molded goods and various extruded plastic products.
1.3 HDPE 8008H
Density: 0.950 | Melt Flow Index (MFI): 8 for high-efficiency thin-wall injection molding.
It is a high-fluidity and high-rigidity HDPE grade optimized for precision plastic molding production.
This material guarantees stable product size and effectively prevents finished parts from warping deformation.
It has better low-temperature cracking resistance performance than ordinary common PE materials.
HDPE 8008H ranks as the top choice for industrial thin-wall injection molding production needs.
Applicable Scenarios: It is mainly used to produce plastic bottle caps and cosmetic pump head accessories.
It also supports the mass production of plastic turnover boxes and small automotive plastic parts.
2. LLDPE (Linear Low-Density Polyethylene)
LLDPE is well-known in the industry for its excellent material toughness and flexible structural performance.
It acts as a core toughening and modification material for optimizing various plastic formulas.
LLDPE 7042 stands as the most representative and widely used mainstream grade of this material.
2.1 LLDPE 7042
Density: 0.920 | Melt Flow Index (MFI): 2.0 for film and plastic modification usage.
This LLDPE grade boasts superior tear resistance and strong puncture resistance for film products.
It maintains stable and reliable performance even in harsh low-temperature working conditions.
It is recognized as a high-quality auxiliary material for industrial plastic modification processing.
Applicable Scenarios: It is commonly used to produce plastic films and durable express delivery packaging bags.
It fits the production of agricultural planting films and industrial protective stretch wrap films.
Blending this grade with HDPE can effectively improve the brittleness of rigid plastic materials.
3. LDPE (Low-Density Polyethylene)
LDPE is a high-pressure polyethylene material specially designed for flexible packaging production.
It features soft texture, good light transmittance and excellent high-temperature heat-sealing capacity.
LDPE 2426H is a classic premium grade dedicated to flexible packaging film production.
3.1 LDPE 2426H
Density: 0.922 | Melt Flow Index (MFI): 2.0 for lightweight flexible film packaging.
Finished products have smooth waxy surface texture and high light transparency for packaging needs.
This grade provides stable heat-sealing performance and smooth processing for mass production.
The produced plastic films are not prone to cracking during continuous industrial production.
Applicable Scenarios: It is the primary material for manufacturing food fresh-keeping packaging films.
It is suitable for daily shopping bags and various composite flexible film packaging products.
This grade dominates the market of lightweight industrial flexible packaging film materials.
